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DESIGN AND DEVELOPMENT OF ON-LINE MULTIPLE-CHOICE
EXAMINATION SYSTEM
A PROJECT
SUBMITTED TO THE INSTITUTE OF INFORr"'1ATION AND
COMMUNICATION TECHONOLOGY, BUET, IN PARTIAL
FULFILMENT OF THE REQUIREMENT FOR THE DEGREE OF
POST GRADUATE DIPLOMA IN INFROMATION TECHNOLOGY.
By
Bisnu Pada Biswas
Student #DF0131007
Ahmad Raihan Shahidullah
Student #DF0131008
Md. Soheb Ahmed
Student #DF0131018
.~~.(-~~
/..~~~ ~I:':"_:"' ""Y.
~.$'. G] t~2$ ,.~~
Under the supervision
of
~0<"~~
~.-1':~5"-/~
j
9*~
,l}'"',- __
Professor Dr. S.M. Lutful Kabir
'~,",f\, ~~
1111111111111111111111111111111111
#S7323#
INSTITUTE OF INFORMATION AND COMMUNICATION
TECHI'JOLOGY, BUET
OCTOBER, 2002
CERTIFICATE
This is to certify that this work has been done by us and it has not
been submitted elsewhere for the award of any degree or diploma.
Countersig ned
Signature of the students
Dr S. . utful Kabir
Supervisor
Professor and Director
IICT,BUET,Dhaka-1000
Bangladesh
Bisnu Pada Biswas
Student #DF0131007
Ahmad Raihan Shahidullah
Student #DF0131008
~
Md. Soheb Ahmed
Student #DF0131018
ACKNOWLEDGEMENT
We want to thank almighty Allah, to whom all praises belong.
Almighty gives us capability, knowledge and patience; those we use
for achieving goal.
We worked for this project under the supervision
of our
respected Professor Dr. S.M. Lutful Kabir. We are grateful for his
constant guidance, suggestion and invaluable assistance. He assisted
us by giving his valuable time throughout
the project work. His
encouragement and motivation helped us to complete our task.
We also want to give thanks to every person who helped us with
their valuable suggestions and assistances.
Contents
Volume - I
1. Introduction
1.1
In GeneraL
1.2
Prevailing
1.3
Main features
1.4
Project Paper Layout...
2. Development
1
On-Line Examination
2
2
Methodology
and Database
2.3 Imp Iem entati
3. Database
of this development...
1
Background
2.1 Development
2.2 Software
System
011
Used
Pia n
.4
4
5
Design
3.1 Description of the Database Developed......................
7
3.2 Data Used for the development
8
4. Software
Design
4.1 Description of the Software Developed......................
9
4.2 Software Testi n9
14
4.3 Softwa re Custo m iza ti 0 n..........................................
15
4.4 Getti ng Hel p...............................................................
16
5. Hardware
Requirements
5.1 Basic Hardw are
l7
5.2 Netwo rk Envi ro nmen t.
18
5.3 T rou bl es hooti n9.............................................................
21
6. Installation
6.1 Oracl e............
22
6.2 Tomcat...
22
6.3 Softwa re..........................................................................
22
7. Conclusion
and Further Development
7.1 Con cIusion
25
7.2 Fu rther work.........
25
References
Append ix
27
:.....
28
Volume - II
1. Mod u Ie 1............................................................................
1
2. Mod uIe 2........................................................................
8
3. Mod u Ie 3............................................................................
20
4. Mod u Ie 4...........................................................................
34
VOLUME - I
Chapter 1
Introduction
1.1 In general
Examination
knowledge
is a means
and potentials
for
for
evaluating
both type
student's
abilities,
of education,
formal
or
informal. Traditional paper based examination is a little bit obsolete in
today's world.
Recent trend is toward online examination
systems.
Development in Technologies especially in the field of communications
has intensified
advantages
accessibility,
the
trend.
Online examination
over paper based examination
simplicity,
record manipulation
security,
system
in the
rapid evaluation,
has many
field
of global
standardization,
and warehousing and even it is possible for a
examinee to complete the examination from home.
1.2 Prevailing On-Line Examination System
Formal and informal academic institutions in many countries are
now using their own customized software to take on line examinations.
A
good
example
of
on-line
examination
system
may
be
the
examinations taken by Cisco Networking Academy. Students need to
log into the academy examinations
After
authentication,
students
server using ID and password.
get chance to give
any number
of
examinations from available. All scores along with given answers are
stored in Cisco System's central server. Students get the opportunities
to view their scores anytime by logging into that server. Some other
on-line
examination
systems
are
examinations
Prometric, ETS etc. In our country we don't have
taken
by
VUE,
many institutions
those offer such examination facilities. Many of them have resources
2
but are reluctant to provide such facilities. Cause of this reluctance
may be from:
.,. Inertia and familiarity with the old system
.,. Unawareness of the recent trend
y
Resource limitation
and reluctances to invest in the new
system
y
Informal education and computer based education is not wellliked in our country
y
Undeveloped communication infrastructure
1.3 Main features of this development
y
Software has been developed in Java, so it is fully platform
independent
y
Oracle has been used as database server. It is
as
adaptable
highly secured, flexible and pioneer of it's kind
y
Tomcat has been used as web server. It is
as
adaptable,
highly flexible, widely used to handle Java Servlets and JSP.
y
Software can be used both in stand alone machine or in
network environment
1.4 Project paper Layout
Project
volume-I
paper
has been divided
and volume-II.
into
two
volumes
namely
Volume-I contains detailed descriptions of
project development, design, and implementation
whereas volume-II
contains the source code of the developed software.
Volume-I comprised of seven chapters. Brief descriptions of each
chapter are given below:
y
Chapter 1 gives an introduction
system,
benefits over traditional
to the on-line examination
paper based examination
3
and problems in our country's respect. It also includes the
main features of the developed software.
,. Chapter 2 describes different aspects considered and followed
while
developing
the
software.
It
also describes
various
software and database servers those have been used while
testing the software. A brief description on how the software
could be implemented is also discussed.
,. Chapter 3 deals with the database objects those have been
created
for
successful
implementation
of
the
developed
software. Some examples of the objects with inserted data
have also been shown.
,.
Chapter 4 describes major features
outcomes when tested in different
requirements
of the software
environment.
and
Necessary
needed to customize the software and related
information sources have been discussed.
,. Chapter 5 describes basic hardware resources necessary both
for server side and client side machines. Equipment required
to implement
the software in networking
environment
has
also been discussed. A short description on possible problems
and solutions which may help users is also discussed in this
chapter.
,. Chapter 6 describes installation
procedure of the developed
software along with installation of other necessary software.
,. Chapter 7 describes limitations,
possibilities to overcome the
limitations and further development of the software.
4
Chapter 2
Development
Background
2.1 Development Methodology
During development
of the software following key points were
continuously focused and monitored
r
Platform independency
r
Security
r
Optimum flexibility
r
User friendliness
r
Reliability
r
Simplicity
r
Versatility
r
Maintainability
2.2 Software and Database Used
Java has been used as the programming language in developing
the software. Some other languages like Visual Basic, Visual C++ may
also be used to do the same task. Due to Java's robust flexibility,
it
was selected to develop the software. Unique feature that makes Java
the best choice is its platform independency. Java Servlet technology
has been used extensively to make this web based software. Scripting
la'nguages namely VBScript, Javascript, PHP, ASP may also be used to
generate web pages. But Servlet supports nearly all features of Java
additionally, Servlet generates html pages dynamically.
Tomcat has been used to handle the Servlets and to handle
desired web pages dynamically.
Tomcat itself has been developed
,
5
using Java, so it is also platform independent. Moreover, Tomcat has
the ability to handle Servlet which other web servers like lIS, Apache
don't have. Developed software has been tested with Tomcat 3.1Ml
and Tomcat 3.3.1.
Oracle8i, Oracle9i, MySQL and Microsoft Access database server
have been tested and used with this software.
servers
were tested
with this software
Different
to ensure that
database
developed
software would be a versatile one.
2.3 Implementation plan
First consideration was to make the web based software platform
independent,
so java was chosen as the language to develop it. As
html page generation was felt essential it was decided to use some
html generating technique namely PHP, JSP, Jservlet etc. Java Servlet
technology has the potential of using full capabilities of java langulage
and it is able to generate html pages dynamically, so it was chosen.
Decision was made to make the developed software database
independent.
But for initial
development
purpose Microsoft access
Database was chosen because of its simplicity. Total task was broken
into following modules:
,. Module 1: To develop and test codes necessary for creating
database tables
,. Module 2: To develop and test codes necessary for iDserting
and manipulating students information in created tables
,. Module 3: To develop and test
codes for
insertion
and
manipulation questions in created tables
,. Module 4: To develop and test codes for giving and evaluating
examinations
6
Decision was made to maintain module's independency, so that
developed software can be customized easily later. After successful
completion
and testing of each module with Access database, the
modules were combined and successfully tested. Then it was decided
to test the software with MySQL and that test was also successful. At
last, effort was given to transform
the whole system to work with
Oracle, as Oracle is the most powerful database server. It was done
successfully and now the software is working fine with Oracle8i/9i.
,
7
Chapter 3
Database
Design
3.1 Description of the Database Developed
For simplicity, three types of tables have been designed namely
Student table, Teacher table and Exam tables and no relationship has
been created between the tables. Brief description of the tables are
given below:
,
Teacher Table - it has two columns (ID,
Exams) holding
values for Course ID and Number of Examinations
will be
taken for the course.
ID - VARCHAR2(15) and PRIMARYKEY
Exams - NUMBER(4)
,
Student Table - it has columns (ID, Name, Examl,
,
, Examn)
holding
Number,
Student
students
for
values
Name,
each
for
Student
Examination
examination
Identification
scores
(No.
Exam2
of
of
every
examinations
mentioned in the Teacher table's Exams column)
ID - VARCHAR2(15) and PRIMARY KEY
Name - VARCHAR2(30) and NOT NULL
Examl,
,
, Examn - NUMBER(4)
Exam Table - n number of tables will be created (n=No. of
examinations
mentioned
in
the
Teacher
table's
Exams
column) with columns (No, Quest, Ansl, Ans2, Ans3, Ans4,
Correct)
Answerl,
holding
values
Answer2,
for
Answer3,
Question
number,
Answer4,
Correct
number for each question.
No - NUMBER(4), UNIQUE_NUMBER and NOT NULL
Question,
Answer
8
Quest - VARCHAR2(200)
Ans1 - VARCHAR2(50)
Ans2 - VARCHAR2(50)
Ans3 - VARCHAR2(50)
Ans4 - VARCHAR2(50)
Correct - VARCHAR2(5)
3.2 Data Used for the Development
These sets of example data for the three tables are shown below:
Teacher table:
ID
Exams
IICT -5133
4
Exam1 table:
Ans2
Ans3
Ans4
Correct
3
4
5
6
3
5*7=7
20
35
30
45
2
10-4=7
3
4
5
6
4
NO
Quest
Ans1
1
2+3=7
2
3
I
Student table:
ID
Name
Exam1
Exam2
Examn-1
Examn
DF0131007
Bishnu
10
7
8
12
DF01310017
Karim
6
8
8
10
DF01310025
Dipta
6
8
8
10
9
Chapter 4
Software
Design
4.1 Description of the Software Developed
Developed software
is web based On-Line Multiple
Choice
Examination System software. User's request from web browser will be
caught and processed by servlets. Connection with the database for
authentication should also be handled by servlets. According to user's
need servlet will generate and send necessary web pages to users web
browser.
,
Tables (Teacher table,
E,xaml, Exam2,
, Examn tables, and
Student table) can be created automatically using the following page
for inserting information
1'1
••••
"nln ('olln.
II> (S'''''&I
r---Ir,--$._1
,,- ----_.,._---_ ...--_.--
---
10
Students registration can be done by using the following page
1~1:"IIz:e:::t/Z;dt.il:!l:l..c::I':Z:\:::!!II.I:.:i::'_C~:.lIHll:j
~I::.illZ:iI:"::::.i::- •__ ._."~II_I!II_
1_.J:-.rJ«t .• -,\, •
'u
:fl, C11 '1lse""h
!Ill!1l:!!l!~!I_~~miKli_:::.!::!_!lI:!_il'.;::iii'
••••::I1;;"",!!y!:~~:;;r;{!.f.i
CiJ~~"'t...l}'~. \,1! ~~.J ~ . ~ ~ oR
1~~;riJi.tlDI"";_'~I-,
••
;_j;,;;~dl
.
m
_.
. .1
3-~Go-!Uft.ooj
.:J
l'l"'ue
EllIff
Slud"111 Nalllf'
(5Irl"C"
1"''''''='''.------Pi •.,•••. Ent •.r Stud",,,, ID (Stri"l _ l'ri.nary 11:•.)')
IOF01Jl0n
For Deletion only Student ID Required
Student's data manipulation can be done by using the following page
r",
r Ex.vrunallonl
ro- Exarrunabon2
.....
-.--.,.---"..----......----r--j'-r
t!tt1Dl.,-N •• -.--
.:J
II
Question insertion can be done by using the following page
.....• _,_.- ..•
ii?'
I,i!
!
Ai'
.,U'__ " (J- '..f, .•.
.3. .:J!QI • .:.l~~
.:....
•..rti_";;;;.:;,;;..~;.:.:../,,;;~;.'"~~. -,.,-;.~,
..__.,_._.•.
_ .•.. u.!1~!'4-
Enl••••••••••••1(S'mtll
EnI•• An,,,, •• 2 (stnoe)f
,J{~1
EnI •• "" ••••••.
,,"_
u....
C ••• « •.•.•••••••.•
1'1 •• (lrl•••
.1iJ ••••
•• 4
(S>J"'&li
Froio<
,:f------
-----'---.---------~--------.-----r,r~~...__
-"
Question manipulation can be done by using the following page
I>
••. ...
- ,_. ,- ..•
I
liM
i!
.•._ •.•. ~~C1''o:l-
.ioI,
••••
- a-:;'lJ ~.3'.:JiO:':.::.l':'~
.••••.;. [., •••• /""#.,;,. •••••.•••.••.,t- .•.._
"' .•.•.•_,,1
," A~.-.2
r "'o ••••• l
CM~
•• C"", An,
I
-"".J
.•,,~.
:::r~,;-r••• ~
d
CM
t1•••.
V_f,.., ••••o..,l ••f~"
•••••.
~~~';':.J~
Il
••••
)
12
Some other pages are also available for performing
seeing every student information,
Using the following
seeing every inserted questions etc.
page, particular
available examinations
necessary tasks as
examination
can be chosen from
by an examinee
L~.,..H_ 'ob<~
L~ •••••ID ['FOIJlOIS
!r-rQ' •••••
_
Using the following
page number of questions per page can be chosen
by an examinee
L~
••••
II••.•••••.•••
L~"",ID r'Fo1l1019
&_,
»n •• SC.rI bllUD" 10 pro~""".
:.fiiiON"-------------.-.----,."--'--'-
..--,..-.-.-.----
---.-,.--.--~-.--.--r
rrlli;;o
.oJ
••
-;;;o--
13
Questions will be generated in a different order for every examinee, so
possibility of unfair means has been minimized
E',
=====i=llljj=
roo
•.•
_
.-.,
._
•••
••••_""'£&UlIl:SOLZO""'=".,,."'==."',..,,=-"'-"'-."'~Z:""~
.~~ •..•. OU.ll~IQ.....;;,--:z'•••.•••'1)_. ;;,,';o . .:.t~.~'t'g
~~.l~.!:.--_~~...:_.!~~"
....
,."".......
L~.,
110m<
lo",,1P
~.~. __
-_"'
~::::,,:"..J.L"J
_
.
I
~3~~-ij
ft ••••
l'f01Jl019
.,
QI 2.;<-'
q
-.
co
.~
.
"".h'
Q) (' ••..••• ~rt••••••••
•• Chot"" ..•••••
""C_al..
!"
1:00»"
Qol 12'"2'2.1
-"
-"
."
'.U .••• ,"""'d
rrri21.---
Examination score will be shown instantly after pressing the Submit
button
Lo••• lt...,. •••.•••
t •.••••
ID DFOUl019
u_i
YOllr Sc;ore is: J.O In 4.0
Perccnl ••ee I,: 75.00°/0
No examinee will be allowed to take the same exam twice without
examiner's permission.
14
4.2 Software Testing
Tomcat
software
3.1M1
and Tomcat
to handle the servlets
3.3.1
has been
and to generate
used
with
dynamically
desired
web pages. JDK1.2 and JDK1.3 has been used to for developing
software and to cooperate with Tomcat.
Windows98,
Windows2000
this
the
Software has been tested in
and Linux platform.
No significant
problems
have been found while testing the software.
In case of Oracle8i, some methods to manipulate
are
not
available
recommended
with
the
to download
built
in
and install
JDBC
the Resultset
driver.
It
is
highly
the latest JDBC driver,
else
program may not function properly.
Oracle9i has built in JDBC driver with all necessary methods to
manipulate
the Resultset.
MySQL 3.23 has built in methods to manipulate
Resultset and
while tested with this software has not shown any considerable errors.
Microsoft
necessary
ODBC
methods
driver
and
it
for
Access
is fully
database
functional
with
also
has
the
the
developed
software.
Developed
software
different
number
having
has been tested
of
questions.
with different
Scores
examinees
calculated
by
the
software and scores calculated manually were same. Some examinees
name, ID, no of questions tested with and scores are given below
Name
ID
No. of questions
score
Khairul
DF0131099
12
10
Tuhin
DF0131079
25
19
Rahim
DF0131099
30
25
15
4.3 Software
Customization
For using other database servers:
,. Some packages needed to
be imported
programs based on database server.
in java
servlet
Every database servers
requites particular package, documentation can be searched
for intended database server
,. Particular driver needed to be registered for each database
server.
Documentation
may
aid
in
finding
necessary
information
,. Connection string needed to be created for the database
server. It will be found in the documentation of the database
server.
,. Java servlet source files needed to be modified using above
three steps, source files needed to be recompiled and byte
code files needed to be replaced the in the "classes" folder of
the web server.
For changing the schema
,. Database administrator has the authority for creating users,
privileges and roles.
,. During creation of the database objects given name and
password should be used. All tables will be created under
given schema
,. User name "scott" and password "tiger" should be chaged
with given name and password in every connection string
found in LoginCheck.java, GetExam.java, GetMessage.java
and GetQuestAns.java. Source files needed to be recompiled
and byte code files needed to be replaced the In the "classes"
folder of the web server.
16
For changing server name and folder name
While requesting the servlets, following should be used
< FORMACTION=http://user
server name: SOBO/userfolder/servlet/
user servlet METHOD=POST/GET>
4.4 Getting help
a) For the standard
software,
the following
web addresses or
help files may be searched to get help on relevant topics
Oracle
http://www .oracle.com, http://education .oracle.com
http://technet.oracle.com/docs/,
http://www.orafaq.com
MySQL:
http://www.mysql.com/documentation/
http://www.mysql.com/portal/books/html/index.html.
Microsoft Access Database:
Built in help with the Access Database
JDK:
http://java .sun.com/prod ucts/
Tomcat:
http://jakarta.apache.org
b) To get help for the developed software,
file (help.txt)
in appendix can be seen.
contents of the help
17
Chapter 5
Hardware requirements
5.1 Basic Hardware
Minimum configurations of the
hardware required
for the
developed software are described below:
Server Side:
IRequirement ] Details
I
pm"~--.--M-in-i-m-a-I-p-ro-c-e-s-s-o-r-:
_
I.
Recommended Processor: Pentium III or above
~
•
I
•
,
Hard disk
-P-en-t-iu-m-I-I--------.
Typical: 256 MB (512 MB recommended)
Minimal installation: 128 MB (256 MB
recommended)
• Typical installation: 2.9 GB
• Minimal installation: 2 GB
• Custom installation: depends on components
selected for installation.
I
iWeb
•
Frames and Java-enabled
IOthers
•
LANCard
I browser
I
18
Client Side:
rRequir;;;entlDetail~
---.----------------------------.-------
1-------
i Processor
i
i
•
Minimal processor: Pentium MMX, Pentium
Celeron or equivelant.
Recommended Processor: Pentium II or above
•
i
,-----------1---------------------------IRAM
•
i
•
!
IH-a--r-d-d-i
s-k--j---.
--'
I
Minimal: 64 MB
Recommended: 128MB
I
-S p~~_;-~~-~-e_;;sa-r-y-fo
r-i ~~t;jJj-n--g-a-n-y-c-Jj-e--n-t-s--i
d-e---I
L
..
..__. .
_
5.2 Network Environment
Considering
different
issues and aspects, following
networking
plan have been proposed:
,. Network should be designed in such a way that all connected
workstations
smooth
way.
authentication
have the ability to connect to the network in a
It
should
server,
have
DNS
all
required
server)
and
software
(ex.
hardware
(ex.
Terminal server, Router) that enable remote user to log into
the network as well.
:.- Developed network should be secured and reliable
:.- Round trip time of the network should be minimum
:.- Developed network should be designed at a minimum
of cost
but one that allows for future technologies to be added easily
19
Necessary equipment that may be required to develop a network
for local and remote access are listed below:
Device Name
No.
Router
1
Terminal Server
1
Switch
2
Hub
4
CAT 5 UTP Cable
500 metre
LAN card
10
Computer
10
20
Server
Elh
~
Host_ 2
~
Hose 5
~
Hose 8
Host_ 3
~
HosC6
~
Host -9
Host_ 4
~
HosC 7
@J-HosCIO
Possible network diagram
21
5.3 Troubleshooting
The frequently
encountered
problems and the methods to solve
them are listed below:
Problems:
,. Broken or disconnect cables
).- Cables connected to the wrong ports
).- Intermittent
cable connection
,. Wrong cables used for the task at hand
).- Transceiver problems or device turned off
,. Improperly
configured serial and Ethernet
interface
,. Improper
clock-rate settings on serial interface
,. Incorrect
IP addresses and Subnet Masks
).- Incorrect
DNS to IP bindings
Solution:
).- Observe some aspect of the universe and invent a theory that
is consistent with what you have observed
).- # Use the theory to make predictions
).- Test those predictions by experiments
or further observations
).- Modify the theory in the light of your results.
).- Go to step #
).- Identify
network/user
problem
,. Gather data about network/user
,. Analyze
data to come up with
problem
a possible
solution
to the
correction
to the
problem
,. Implement
solution
to network
to attempt
system
).- If the
problem
modify data
,. Go to step #
isn't
resolved,
undo previous
changes
and
22
Chapter 6
Installation
6.1 Oracle
Contents in appendix can be seen
6.2 Tomcat
Contents in appendix can be seen
6.3 Software
Step 1:
,. A folder
needed
to be created
in jakarta-tomcatjwebapps
folder (Default is Sohebl)
,. Sub-folders
of jakarta-tomcatjwebappsjexamples
needed
to
be copied into the created folder
r
Html files needed to be placed in the folder created earlier for
the application
o table.html
o
question.html
o
student.html
o exam.html
r
Servlet
webappsj
class files needed to be placed
created folder j WEB-INF jclasses
o
LoginCheck.class
o
GetExam.class
o
GetMessage.c1ass
o
GetQuestAns.c1ass
o AuthenCheck.class
in Jakarta
tomcatj
?'
_J
o AuthenCheck1.c1ass
o AuthenCheck2.c1ass
o
CreateTable.class
o
StudentData.class
o
QuestionData.class
o
DeleteRecord.class
o
DeleteQuestion.c1ass
y A mapping needed to be added for the application
the jakarta-tomcat/conf/server.xml
y
by editing
.
Following needed to be added at the end part of this file
<Context
path="/Sohebl"
docBase="webapps/Sohebl
debug = "0" reloadable ="true" >
</Context>
y
Web page can be called
address ''http://localhost:
Noted that
tomcat/we-
y Servlets
html
file
to
index.html
by using
the
that
is placed
in jakarta-
will be displayed
be
registered
tomcat/webapps/Sohebl/WEBy
web-browser
SOSO/Sohebl"
bapps/Sohebl
needed
from
by
INF/web.xml
editing
jakarta-
file
Following code for each servlet needed to be added
<servlet>
<servlet-name>
servlet name
</servlet-name>
<servlet-c1ass>
class names of the servlet java
jakarta-tomcat/webapps/created
</servlet-c1ass>
</servlet>
file those are placed in
folder/WEB-INF/
classes
24
).- Servlets can be called by http://localhost:BOBO/Sohebl/
servlet/servletname
Step 2:
Tomcat needed to be started
Step 3:
Database server needed to be started
Step 4:
;;. Connection
to
the
web
server
(Tomcat)
''http://server
name:BOBO/Sohebll" can be made using web browser from
server/client machine
;;. If the html pages mentioned above can be seen, installation is
successful
Chapter 7
Conclusion and Further Work
7.1 Conclusion
Design of a program
programmer.
depends
upon the style
chosen
by. the
None can say that his one is the last as better and better
solutions
are coming everyday.
software,
some may due to ignorance and some may due to lack of
experiences.
software.
There
We may have many limitations
are many
chances
for others
in our
to enhance
We wish best for our followers to give something
this
better.
7.2 Further work
This software
has been designed to take multiple
required for a particular
•
for
taking
improvement
multiple
examinations
course. It is possible to develop the software
examinations
for
multiple
courses.
Further
of the developed software is possible. Some suggestions
have been pointed out for the further work:
;... Examination
created
by
ID+Examn,
tables
Exam 1, Exam2,
, Examn
using
name ID+Exam 1, ID+Exam2,
can be
,
where ID implies Course Identification
(Teacher
Table's ID Column)
I'
Multiple
Student
"ID+Student"
table
can
be
created
for holding student's
by
using
name, Student's
name
ID and
scores for each course.
;... While taking exams student can be given options to choose a
particular
method
particular
course
from
available
used in the software
examination
courses.
Then
can be applied
from available
the
same
to evaluate
a
designed for a course.
26
Examination
score then can be inserted
in the "ID+Student"
table, created for a particular course.
r
In student table Examl,
Exam2,
, Examn columns can be
used to store nested table or varray. This nested tablejvarray
can be used to store answers given by the student
for later
verification
r
Question bank can be made, from where a given number of
questions
will populate
the exam tables.
Database
triggers
can be used for this purpose
,. While inserting
information
of a new student
in the register
office, student table can be updated by using triggers
r
An extra
column
in the student
value for activation
,.
r
or deactivation
By using multithreading
time
automatically
when time expires
present
become difficult
and
technique,
examination
In the
table can be used to hold
system
to
with
to maintain
of the examinations
it is possible to monitor
activate
new academic
submit
button
session,
it will
the table with inserted
may be possible to add year as "2002"
names
the
data. It
to add with all table
27
References
[I] JA VA HOW TO PROGRAM BY DEITEL & DEITEL
[2] JA VA ONLINE TUTORIAL: TRAIL BY MA YDENE FISHER
[3] CORE SERVELETS AND JAVASERVER
PAGES BY MARTY HALL
[4] ORACLE 8i/9i DOCUMENTATION
BY ORACLE CORPORATION
[5] ORACLE8i
MINDS
AND ADMINISTRATION
DBA: ARCHITECTURE
BY HUNGRY
[6] JAKARTA TOMCAT DOCUMENTATION
[7] MySQL DOCUMENTATION
BY FREE SOFTWARE FOUNDATION
28
Appendix
(From Oracle Documentation)
Using Oracle Universal Installer
Oracle Universal Installer automatically
Environment
installs the Java Runtime
(JRE). The JRE is a subset of the Java
(JDK). To run Java
applications,
applications,
JRE is required.
Developer
To develop
Kit
Java
JDK is required.
Non-Interactive
Typically,
Insta IIation
Installer
can be run in interactive
mode. However, installer in non-interactive
or silent mode is available
for advanced
Oracle Universal
users (such as database
administrators),
by using a
response file. This is a text file containing vai-iables and values used by
Oracle Universal
Installer
during
the installation
process.
Using the
silent installation
enables to bypass the graphical user interface
(GUI)
and install Oracle products in silent mode.
To use a response file, response file should be modified and it is
located in the \Response folder located at the root of the Oracle8ij9i
Enterprise
Edition CD-ROM. Accompanying
readme.txt
file can be seen
for more information.
Running the Installation
The following
Oracle8ij9i
steps describe a Typical, interactive
Enterprise
Edition
Minimal or Custom installation
for
Windows
installation
NT. Users,
choosing
may encounter a slightly different
of
a
set of
windows.
To install a Typical installation
for Windows NT:
of Oracle8ij9i
Enterprise
Edition
29
.,. Operating
running,
system
be started.
If Windows
NT 4.0 is
logging to Windows NT server as a member
Administrators
r
should
of the
group is required
All Oracle services should be stopped (if any are running).
For Windows NT 4.0, services can be stopped as follows:
From the Control Panel, services icon can be selected.
If any Oracle services
(names
begin with Oracle)
exist and
have the status Started, it should be stopped
.,. OracleSi Enterprise
CD-ROM drive.
the
Autorun
Windows
Edition CD-ROM should
The Autorun
page
does
NT Explorer
be inserted
page automatically
not
should
appear,
Start
be chosen.
into
appears.
>
If
Programs>
The Windows
NT
Explorer will start
r
Navigation
to the root directory
of the CD-ROM is needed.
SETUP.EXE should be double-clicked.
Oracle
Universal
Installer
will
The welcome screen for
appear
and
installation
will
begin
;,.. Selection
must
be made
when
prompted
by the
OracieSi
Enterprise Edition -Autorun dialog box:
Add/Remove
Products
Explore CD
Browse
.,. Selecting
Add/Remove
Products
will
begin
the
installation
process. The Welcome window will appear
,. Clicking
Next
is required.
The
File Locations
window
will
appear. Source ... field must not be changed
,. Oracle Home name and directory
OracleSi/9i
Enterprise
Edition
location is required to install
components.
The
default
30
location
is
<drive
with
the
most
available
space> :\ORACLE\ORASI or \ORACLE\ORA9I
:,...Clicking Next will proceed. The Available Products window will
appear
,. Oracle
product
OracleSij9i
should
be selected
to
install
is
Enterprise Edition)
:,...Clicking Next will proceed. The Installation
appear.
(default
Appropriate
installation
type
Types window will
is required
(Typical,
Minimal, or Custom)
,. Clicking
Next
will
Documentation
proceed.
window
The
Location
for
Oracle
will appear for a Typical or Custom
installation.
Hard Drive selection to install the documentation
will
documentation
install
documentation
:,...Clicking
prompt
on
the
hard
drive.
Otherwise,
will remain on the CD-ROM
Next will proceed. At this point of the installation,
to upgrade database with the Oracle Data Migration
Assistant may appear (if Oracle Universal Installer
detects an
earlier version of an Oracle database on hard drive). Selecting
the Migrate an Existing Database check box will make Oracle
Data Migration Assistant start immediately
migrate
existing
Identification
database.
Click
after installation
Next.
The
to
Database
window appears
,. Global Database
Name and SID in the fields
provided
are
required
:,...Clicking Next will proceed. The Summary window will appear
listing
the
Requirements,
Global
Settings,
Product
Languages,
and New Installations
,. Install should be clicked. After the components
the
Space
Configuration
Tools
window
will
appear
are installed,
and
NetS
31
Configuration
Assistant
automatically
start
and other appropriate
in succession.
The
assistants
Configuration
will
Tools
window will display the results of running these assistants
:.- Clicking Next will proceed. The End of Installation
window will
appear.
:.- Clicking Exit is needed to exit from Oracle Universal
Installer
or clicking Next is needed to install another product.
(From Jakarta Tomcat Documentation)
Installing
Tomcat
This
available
section
deals
with
installing
the Tomcat
binary
archive
from the Jakarta Project. It is also possible to install Tomcat
by building it from source, but that isn't covered here. Downloading
of
the
is
appropriate
jakarta-tomcat-<version>
binary
archive
file
necessary. For Linux, RPMs are also available.
Archive should be expanded
into some directory
or C:\). This should create a new subdirectory
<version>".
use the
Renaming this directory
new name
should
named "jakarta-tomcat-
is also possible.
be followed.
(say /usr/local
For Linux,
Instructions
to
RPMs may
be
installed with the command "rpm -Uvh". Command man rpm will give
more information.
Environment
There
Tomcat.
these
Setup
are a number
of different
There are differences
methods.
This
section
methods
in the environmental
addresses
the
to start
setup needed for
environmental
needed for using the shell scripts and batch files provided
starting
and stopping
Tomcat.
and stop
to simplify
This section assumes manual
and stopping of Tomcat from a shell or MS-DOS window.
setup
starting
In
a shell
<vers;on>"
or
directory
Setting
the
DOS window,
to the
"jakarta-tomcat-
is required.
environment
point to the root directory
the Java interpreter
exact directory
change
variable
JAVA_HOME is required
of your JDK hierarchy.
to PATH environment
to
Optional addition
variable
is possible.
of
The
may vary from system to system. Checking of local file
system should be done to be sure where Java is installed.
Win32:
JAVA_HOME=c:/jdk1.3.1
PATH=%JAVA_HOME% \bin; %PATH%
Unix (bash/sh):
JAVA_HOME=/usr/localjjava/jdkl.3.1;
export JAVA_HOME
PATH=$JAVA_HOME/bin: $PATH;
export PATH
Unix (tcsh):
JAVA_HOME=/usr/localjjava/jdkl.3.1
PATH $JAVA_HOME/bin:$PATH
TOMCAT_HOME environment
variable is optional.
shell/batch
scripts are executed
from
from
"bin"
then
its
subdirectory,
"jakarta-tomcat-<vers;on>"
they
will
successfully
TOMCAT_HOME if not already set. If these shell/batch
to
be executed
mandatory.
from
other
If the supplied
directories,
setting
or
set
scripts needed
TOMCAT_HOME
is
33
On Win32 systems:
TOMCAT_HOME=c: \jakarta-tomcat-
<version>
On UNIX (using bash/sh):
TOMCAT_HOME=/usr/local/jakarta-tomcat-
<version>;
TOMCAT_HOME
On UNIX (using tcsh):
>
TOMCAT_HOME /usr/local/jakarta-tomcat-<version
Starting Tomcat
After
environment
opening
a shell
or
MS-DOS
window
and
as described in the prior section, starting
setting
the
and stopping of
Tomcat can be done.
Tomcat can be started:
On Win32: bin\startup
On UNIX: bin/startup.sh
This will start Tomcat in the background on Unix based systems,
or in a new MS-DOS window
on Windows
based systems.
A short
period of time is needed before Tomcat is ready to serve requests. The
very first use will need a little extra time since some WAR files will be
expanded by default.
Whether Tomcat
has completed
can be verified
by its startup,
when text like the following appears in the log output.
2001-09-01
14:23:30
- Http10Interceptor:
2001-09-01
14:23:30
- Ajp12Interceptor:
Starting on 8007
2001-09-01
14:23:30
- Ajp13Interceptor:
Starting on 8009
In Tomcat's
assigned
to a file.
default
configuration,
Instead,
Tomcat's
Starting on 8080
Tomcat's
log output
output
log is not
goes stderr.
On
34
Windows systems,
switching
to the MS-DOS window can be done to
see if this test has appeared.
The default Tomcat configuration
port 8080.
Starting
browser
will service HTTP requests on
with http://localhost:8080/
will present
Tomcat's Welcome page.
In addition to serving HTTP, the default configuration
will service
Ajp12 protocol requests on port 8007 and Ajp13 protocol
requests on
8009.
which
These
Tomcat
protocols
are
used by the
to be used as a Servletj]SP
"connectors"
container
allow
for an external
web
server, such as Apache. Also, the Ajp12 protocol is used by the Tomcat
shutdown process.
Options and system property settings can be passed to the Java
VM
by
specifying
them
TOMCAT_OPTS (for
enhancement
instance:
if
in
an
environment
'-server'
running
is useful
Sun's
variable
called
as a performance
HotSpot
VM).
Note: On Win9x, it's not possible to include system property
settings
in TOMCAT_OPTS because the SET command won't accept a line with
more than one equals sign.
The
servers,
"auto-generated"
configuration
such as Apache, are not written
Tomcat. To write the configuration
command.
Tomcat will initialize
files
for
during a normal
files, append jkconf
sufficiently
external
web
startup
of
to the startup
to write the files and then
exit. This may be done while the Tomcat is running as a web server.
Stopping Tomcat
To perform a normal shutdown
of Tomcat, a special "shutdown"
request must be send from a separate process, or possibly a different
computer.
In the default configuration,
that "shutdown"
request must
be made using the Ajp12 protocol. If the shell or MS-DOS window used
35
to start Tomcat is not still open, opening a new one is essential and
environment
should be set as same as for starting Tomcat.
Tomcat can be stopped:
On UNIX: bin/shutdown.sh
On Win32: bin\shutdown
The
shutdown
process
incorporates
password. In the default configuration,
This
means
computer
being
that
Tomcat
that started
This
shutdown Tomcat:
means
protocol.
that
host,
port,
and
a
the host defaults to localhost.
be shutdown
it. The port automatically
used by the Ajp12
specified".
can only
a
defaults
The password
a password
will
from
not
the
to the port
defaults
be
same
to "not
required
to
36
Developed Software
Some frequently
occurred problems and their solutions are given
below
Ql. Tomcat cannot be started, what can be done?
Ans. Oracle's TNSListener should be stopped, Tomcat should be
started (TNSListener should be started again).
Q2. Required html pages can not be found, what can be done?
Ans.
Stepl>
Given URL should be checked, if URL is ok step 2 should
be followed else it must be fixed.
Step2> With http://Iocalhost:8080/
uri, if Tomcat's starting
page
comes, Step 4 should be followed else Step 3.
Step3> If Tomcat is not running, Starting Tomcat Section in the
appendix section can be seen.
Step4> Web folder, context mapping and servlet registration
should be checked for errors.
Q3. Invalid argument
call error has shown, what should be done?
Ans. This problem can be solved by filling imperative
Q4.How network adapter connection
Ans. Oracle TnsListener
Q5. How connection
text boxes.
problem can be solved?
should be started.
refusal problem can be solved?
Ans. Database should be mounted and opened ..
37
Q6. Invalid username and password error, how to eliminate?
Ans.
Spelling
administrator
should
be
checked,
if
it
doesn't
work
database
should be consulted.
Q7. Deletion of any data without giving Student ID or Question
Number is possible, why?
Ans. No actual row will be deleted from the tables.
Q8. Data can not be inserted or modified, why?
Ans. All mandatory
text boxes needed to be filled.
Q9. While there are question in tables it shows no question is
available,
how to solve?
Ans. Due to connection
back and then returning
Ql0.
problem it may happen, moving one pages
will solve the problem
How number of questions per pages can be changed after
starting the examination
Ans. Once examination
is started this option can not be changed.
Ql1. Table's can not be created, why?
Ans. Old tables with the same name should be deleted (All old
information
will be erased)
Q12. What will happen, if database objects are created in different
schemas.
Ans. Username and password used in Module - 4 Source Codes should
be changed. Otherwise students will not be able to connect.
VOLUME - II
Module 1
Codes necessary for creating database tables.
table.html
<HTML>
<HEAD>
<TITLE >LOGIN </TITLE> </HEAD >
< BODY>< FORMACTION= http://localhost :SOSO/Sohebl/servlet/ AuthenCheck
METHOD=POST>
<H3>Please enter login name and identification number.</H3><BR>
<PRE>
Name: <INPUT TYPE=text NAME=Name>
ID:
<INPUT TYPE=text NAME=ID>
</PRE>
<INPUT TYPE=SUBMIT value=Submit>
<INPUT TYPE=reset>
</FORM>
</BODY>
</HTML>
Authencheck.java
import java.sql. *;
import javax.swing.*;
import oracle.sql. *;
import java.io. *;
import javax.servlet. *;
import javax.servlet.http.
*;
import java.util.*;
import oracle.jdbc.driver. *;
import java.math.*;
//AuthenCheck will check for valid user in the database
public class AuthenCheck extends HttpServlet
{
Cannection conn;
Statement stmt;
ResultSet rset;
public void init(ServletConfig config) throws ServletException
{
2
super.init( config);
)
public void doPost(HttpServletRequest req,HttpServletResponse res)
throws IOException
{
int i=O,exams;
PrintWriter output;
/ /Tname for holding Teacher Name and Tid for holding Teacher ID
String Tname='''',Tid='''';
Tname= req.getPara meter("'Name");
if(Tname==null) Tname=Tname+"@";
Tid = req .getParameter("ID");
if(Tid==null)
Tid=Tid+"@";
String stl,st2;
boolean identification=false;
try
{
DriverManager. registerDriver (new oracle.jdbc.driver.OracleDriverO);
conn =
DriverManager.getConnection ("jdbc: oracle :thin:@netvista103: 1521: soh9i 1",Tname,
Tid);
stmt = conn.createStatement
0;
rset = stmt.executeQuery ("select D. * from dual D");
identification =true;
}
catch(Exception sqlex)
{
output= res.getWriter();
res.setContentType( "text/html");
output.println(" <H2 >Check following errors</H2>");
output. println (sqlex);
output.closeO;
}
if (identification)
{
Cookie c1=new Cookie("Tname",Tname);
c1.setMaxAge( -10);
Cookie c2=new Cookie("Tid",Tid);
c2.setMaxAge( -10);
res.addCookie(c1) ;
res.addCookie(c2) ;
output= res.getWriterO;
res.setContentType( "text/html");
String Buffer buf=new StringBuffer();
buf.append(" < HTML>< HEAD><TITLE>");
buf.append("Table Creation Page");
buf.append (" </TITLE> </HEAD> < BODY>");
buf.append(" < FORMACTION= http://netvista 103: 8080/Sohebl/servlet/CreateTable
METHOD=POST>");
buf.append("<BR>"+"<H3>Please
Enter Course ID (String)</H3>");
buf.append("<INPUT TYPE=text NAME=courseid>"+"<BR>");
buf.append("<BR>"+"<H3>Please Enter Number of Examinations(Integer)</H3>");
buf.append(" <INPUT TYPE=text NAME=examno>"+" <BR><BR>");
buf.append(" <INPUT TYPE=Submit Vaiue=Submit>"+"<BR>");
buf.append(" </FORM> </BODY> </HTM L>");
output. println( buf.toString());
output.c1ose() ;
}
}
public void destroy()
{
try
{
conn .close();
}catch(Exception e) {System.err.println("Problem
closing the database");}
}
}
CreateTable.java
import java.sql. *;
import javax.swing. *;
import oracle.sql. *;
import java.io. *;
import javax.servlet. *;
import javax.servlet.http. *;
import java.util. *;
import oracle.jdbc.driver. *;
import java.math. *;
//CreateTable will creates necessary tables in the database under teacher schema
public class CreateTable extends HttpServlet
{
Connection conn;
Statement stmt;
4
ResultSet rset;
public void init(ServletConfig
config) throws ServletException
{
super.init( config);
}
public void doPost(HttpServletRequest
req,HttpServletResponse
res) throws
IOException
{
PrintWriter output;
Cookie cookies[]=null;
cookies= req .getCookies();
/ / Retrieving Teacher Name and ID from cookies
String Tna me= "" ,Tid = "" ,course= null,examno_string =null;
int examno=O,exam=O;
course= req .getParameter("courseid");
examno_string = req .getParameter("examno");
if (cookies' =null)
{
for (int i=O;i<cookies.length;i++)
{
Cookie cookie = null;
cookie=cookies[i] ;
if( (cookie.getName()) .equals("Tname")) Tname=cookie.getValue();
if( (cookie.getName()) .equals("Tid")) Tid =cookie.getValue();
}
}
try
{
examno= Integer. parseInt( examno_string);
}catch(NumberFormatException
e)
{
output= res.getWriter();
outpuLprintin("<H2 >Check following errors soheb</H2>");
output. println( e);
res.setContentType("text/html")
;
String Buffer buf= new StringBuffer();
buf.a ppend(" < HTML> < HEAD> <TITLE>");
buf.append("Table Creation Page");
buf.a ppend(" </TITLE> </HEAD> < BODY>");
buf.append(" < FORMACTION= http://netvista 103 :8080/Soheb l/servlet/ AuthenCheck
METHOD=POST>");
buf.append("<INPUT
TYPE=HIDDEN NAME=ID VALUE="+ Tid+" >");
buf.append("<INPUT
TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append(" <BR><INPUT
TYPE=Submit Value= Back>"+"<BR>");
buf.append("' </FORM > </BODY>
output. println( buf. toString(»;
output.close()
}
try
</HTML>");
;
{
DriverManager .reg isterDriver(new
oracle.jdbc.d river.OracleDriver(»;
conn =
DriverManager.getConnection("jdbc:
oracle :thin:@netvistal03:
1521 :soh9i 1", Tname,
Tid);
stmt = conn.createStatement
();
I I Creating Teacher Table
rset = stmt.executeQuery
("CREATE TABLE Teacher(ID
VARCHAR2(15) CONSTRAINT Teacher_Prim
PRIMARY
KEY,Exams NUMBER(4) )");
rseLclose() ;stmLclose();
stmt = conn.createStatement
();
II Inserting Course Name and No. of Examinations
rset = stmLexecuteQuery("INSERT
in the Teacher Table
INTO Teacher
VALUES(''' +course+ '" ," +examno+")");
rset.close() ;stmt.close();
stmt = conn .createStatement();
("'Select T. * from Teacher T");
rset = stmt.executeQuery
while (rset.next())
{
exam=rset.getlnt(2)
;
}
rset.close() ;stmt.close();
stmt = conn.createStatement();
IICreating Examl, Exam2,
,Examn Tables
for (int i=O;i<exam;i++)
{
String name="Exam";
name=name+(i+
1);
rset = stmt.executeQuery
("CREATE TABLE "+name+"
(No Number(4)
UNIQUE CONSTRAINT NotNull_Number"+i+"
CONSTRAINT Unique_Number"+i+"
NOT Null,Quest VARCHAR2(200),Ansl
VARCHAR2( 50) ,Ans2 VARCHAR2( 50) ,Ans3 VARCHAR2( 50) ,Ans4
VARCHAR2(50),Correct
VARCHAR2(5»)");
6
}
rset.c1ose() ;stmLclose();
stmt = conn.createStatement();
rset = stmLexecuteQuery ("Select T. * from Teacher T");
while (rset.next())
{
exam=rset.getlnt(2)
;
}
rset.c1ose() ;stmt.close();
stmt = conn.createStatement();
((Creating Student Table
rset = stmt.executeQuery
("CREATETABLE Student(ID VARCHAR2(15) CONSTRAINT Student]rim
PRIMARY
KEY,Name VARCHAR2(30) CONSTRAINTStudenCName NOT NULL)");
rset.close() ;stmLclose();
stmt = conn.createStatement();
for (int i=O;i<exam;i++)
{
String name="Exam";
name=name+ (i+ 1);
rset = stmt.executeQuery
("ALTER TABLE Student ADD ("+name+"
NUMBER(4))");
}
conn.c1ose() ;
output= res.getWriter();
res.setContentType("text(html")
;
output. println(" <H2> Tables Created«H2 >");
outpuLclose() ;
}catch(Exception
sqlex)
{
output= res.getWriter();
output.println(" <H2 >Check following errors«H2
>");
output. println(sqlex);
res.setContentType("text(html") ;
String Buffer buf=new StringBuffer();
buf.append (" <HTML> < HEAD> <TITLE>");
buf.append("Table Creation Page");
buf.append(" «TITLE> «HEAD> < BODY>");
buf.append(" < FORMACTION= http:((netvista103:8080(Sohebl(servlet(AuthenCheck
METHOD=POST>");
buf.append("<INPUT TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.append("<INPUT TYPE=HIDDEN NAME=Name VALUE="+Tname+">");
7
buf.append(" <BR><INPUT TYPE=Submit Value=Back>"+"<BR>");
buf.a ppend(" </FORM > </BODY> </HTML>");
output. println( buf.toString(»;
output.close() ;
}
}
public void destroy()
{
try
{
conn .close();
}catch(Exception e) {System.err.println("Problem
}
}
closing the database");}
8
Module 2
Codes necessary for inserting
and manipulating
students
information
in Student table
student.html
<HTMl>
<HEAD>
<TITLE >lOGIN </TiTlE > </H EAD>
< BODY><FORM ACTION= http://localhost:
8080/Sohebl/servlet/
AuthenCheckl
METHOD=POST>
<H3>Please enter login name and identification number.</H3><BR>
<PRE>
Name: <INPUT TYPE=text NAME=Name>
ID:
<INPUT TYPE=text NAME=ID>
</PRE>
<INPUT TYPE=SUBMIT value=Submit>
<INPUT TYPE=reset>
</FORM>
</BODY>
</HTMl>
AuthenChecklJava
import java.sql. *;
import javax.swing. *;
import oracle.sql. *;
import java.io. *;
import javax.servlet. *;
import javax.servlet.http. *;
import java.util.*;
import oracle.jdbc.driver. *;
/ / AuthenCheckl will check for valid user in the database
public class AuthenCheckl extends HttpServlet
{
Connection conn;
Statement stmt;
ResultSet rset;
public void init(ServletConfig config) throws ServletException
9
{
super. init( config);
conn=null;
stmt=null;
}
public void doPost(HttpServletRequest req,HttpServletResponse res) throws
IOException
{
int i=O,exams;
PrintWriter output;
/ /Tname for holding Teacher Name and Tid for holding Teacher ID
String Tname="",Tid="";
Tname= req .getParameter(" Name");
if(Tname==null) Tname=Tname+"@";
Tid = req .getParameter("ID");
if(Tid==null)
Tid=Tid+"@";
String stl,st2;
booiean identification=false;
try
{
DriverManager. registerDriver (new oracle.jdbc.driver.OracleDriver();
conn =
DriverManager.getConnection("jdbc:oracle
:thin:@netvista103: 1521: soh9i 1",Tname,
Tid);
stmt = conn.createStatement
0;
rset = stmt.executeQuery ("select D. * from dual D");
identification =true;
}catch(Exception sqlex)
{
output= res.getWriter();
res.setContentType("text/html")
output.println("<H2>Check
;
following errors</H2>");
output. println(sqlex);
output.close() ;
}
if (identification)
{
Cookie c1=new Cookie("Tname",Tname);
c1.setMaxAge( -10);
Cookie c2=new Cookie("Tid",Tid);
c2.setMaxAge( -10);
res.addCookie(c1) ;
10
res.addCookie(c2) ;
output= res.getWriter();
res.setcontentType("text/html")
;
String Buffer buf=new StringBuffer();
buf.append(" < HTML>< HEAD><TITLE>");
buf.append("Table Creation page");
buf.append(" </TlTLE> </HEAD> < BODY>");
buf.append(" < FORMACTION= http://netvista 103: BOBo/soheb1/servlet/StudentData
METHOD=POST>");
buf.append(" < BR>" +" < H3> Please Enter Student Name (String) </H3 >");
buf.append("<INPUT TYPE=text NAME=stdname size=30>"+"<BR>");
buf.append("<BR>"+"<H3>Please Enter Student 10 (String - Primary Key)</H3>");
buf.append("<INPUT TYPE=text NAME=stdid size=15>"+"<BR><BR>");
buf.append("<BR>"+"<H2>For
Deletion only Student 10 Required</H2><BR>");
buf.append("<INPUT TYPE=Submit name=Student Value=Enter>");
buf.append("<INPUT TYPE=Submit name=Student Value=Delete>");
buf.append("<INPUT TYPE=Submit name=Student value=AIIStudents>");
buf.append("<INPUT TYPE=Submit name=Student value=Exit>");
buf.append(" </FORM> </BODY > </HTML>");
output.println(buf.toString())
;
outPut.c1ose() ;
}
}
public void destroy()
{
try
{
conn.c1ose();
}catch(Exception e) {system.err.println("problem
closing the database");}
}
}
StudentData.java
import java.sql.*;
import javax.swing.*;
import oracle.sql. *;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http. *;
import java.util.*;
import oracle.jdbc.driver.*;
II
IIStudent
Data to insert, update student information
public class StudentData extends HttpServlet
{
Connection conn; Statement stmt; ResultSet rset;
public void init(ServletConfig config) throws ServietException
{
super.i nit( config);
}
public void doPost(HttpServletRequest req,HttpServletResponse res) throws
IOException
{
PrintWriter output;
Cookie cookies[]=null;
cookies= req .getCookies();
II stdid= Student ID, stdname= Student Name, surf= holds option
String Tname= "" ,Tid = "" ,stdid =null ,stdname= null,surf="";
int examno=O,exam=O;
stdid = req.getParameter("stdid");
stdname= req .getParameter("std name");
if (cookiesl =null)
{
for (int i=O;i<cookies.length;i++)
{
Cookie cookie = null;
cookie=cookies[i] ;
if( (cookie.getName()) .equals("Tname")) Tna me=cookie.getValue();
if( (cookie.getName()) .equals("Tid")) Tid =cookie.getValue();
}
}
try
{
DriverManager. registerDriver( new oracle .jd bed river. OracieDriver()) ;
conn =
DriverManager.getConnection("jdbc:
oracle: thin:@netvista103: 1521: soh9i 1",Tname,
Tid);
stmt = conn.createStatement();
rset = stmt.executeQuery("SELECT T* FROMTEACHERT");
rset.next() ;
exa mno= rset.getlnt("Exams");
rseLclose() ;stmt.close();
}catch(Exception sqlex){}
if( req .getParameter("Student")
.equaIs(" Enter")) surf= "Enter";
12
if( req .getParameter("Student")
.equals("Delete"»
surf="Delete";
if( req .getParameter("Student")
.equals(" AIIStudents"» surf="AIiStudents";
if( req .getParameter("Student")
.equals("Exit"»
surf="Exit";
if (surf.equals("Exit"»
{
I ITo exit
output= res.getWriter();
res.setContentType("text/html")
;
String Buffer buf=new StringBuffer();
buf.append(" < HTML> < HEAD><TITLE>");
buf.append(" </TITLE > </HEAD > < BODY>");
buf.append(" <FORM
ACTION=http://netvista
103: 8080/Sohebl/servieti
METHOD=POST>");
buf.append("<H3>Please
buf.append("Name:
AuthenCheckl
enter login name and identification number. </H3 > < BR>");
"+"<INPUT TYPE=text NAME=Name><BR>");
buf.append("ID:"+"
<INPUT TYPE=text NAME=ID><BR>");
buf.append("<INPUT TYPE=Submit Value=Submit>");
buf.append("<INPUT TYPE=Reset>");
buf.append(" </FORM > </BODY> </HTML>");
output. println(buf.toString
(»;
output.c1ose() ;
}
if (surf.equals("Enter"))
{
I I For insertion new student
try
{
stmt = conn.createStatement();
rset = stmt.executeQuery("INSERT INTO Student(ID,Name)
VALUES('''+stdid+ ,n, '" +std name+ ,n)");
rset.close() ;stmt.close();
stmt = conn.createStatement();
rset = stmt.executeQuery("COMMIT");
output= res.getWriter();
output. println (" <H2 >Inserted SuccessfullY</H2 >");
res.setContentType( "text/html");
String Buffer buf= new String Buffer();
buf.a ppend(" < HTML>< HEAD> <TITLE> ");
buf.append("Insertion
Creation Page");
buf.a ppend(" </TITLE> </HEAD> < BODY>");
13
buf.append("<FORM
ACTION= http://netvista
103: SOSO/soheb1/ servlet/ AuthenCheck 1
METHOD=POsT>");
buf.append("<INPUT 1YPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.append("<INPUT 1YPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append("<BR> <INPUT 1YPE=submit Value=More>"+"<BR>");
buf.append(" </FORM > </BODY> </HTML>");
output. println( buf.tostring());
outpuLclose() ;
rseLclose() ;stmt.close();
}catch(Exception sqlex)
{
output= res.getWriter();
output.println(" <H2>Check following errors soheb</H2 >");
output. println (sqlex);
res.setContentType("text/html")
;
stringBuffer buf= new stringBuffer();
buf.append(" < HTML>< HEAD> <TITLE>");
buf.append("Table Creation Page");
buf.append(" </TITLE> </HEAD > < BODY>");
buf.append("<FORM
ACTION= http://netvista
103: SOSO/soheb l/servlet/ AuthenCheck 1
METHOD=POsT>");
buf.append("<INPUT 1YPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.append("<INPUT 1YPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append(" <BR><INPUT 1YPE=submit Value= Back>"+"<BR>");
buf.append(" </FORM > </BODY > </HTML>");
output. println (buf. tostring());
outpuLclose() ;
}
}
if (surf.equals("Delete"))
{
/ / For deleting student's information
try
{
output= res.getWriter();
res.setContentType("text/html")
;
String Buffer buf=new stringBuffer();
buf.a ppend(" < HTML>< HEAD><TITLE >");
buf.append("Deletion Creation Page");
buf.append(" </TITLE > </HEAD > < BODY>");
14
buf.a ppend(" < FORMACTION= http://netvista
METHOD=POsT>");
103: 8080/soheb 1/servlet/DeleteRecord
buf.append (" <INPUT TYPE=radio NAME=ExamName VALUE=AIl>" + "All" +" < BR>");
for(int j=O;j<examno;j++)
{
buf.append("<INPUT TYPE=radio NAME=ExamName VALUE=Exam"+(j+ 1)+"
CHECKED>"+"Examination"+(j+ 1)+" <BR>");
}
buf.append("<INPUT TYPE=HIDDEN NAME=ID VALUE="+Tid+">");
buf.append("<INPUT TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append("<INPUT TYPE=HIDDEN NAME=stdid VALUE="+stdid+">");
buf.append("<BR><INPUT TYPE=submit Value=Done>"+"<BR>");
buf.append(" </FORM > </BODY> </HTM L>");
output. println( buf.tostring 0);
output.closeO;
}catch(Exception
{
sqlex)
output= res.getWriterO;
output.println("<H2>Check
output. println(sqlex);
following errors</H2>");
res.setContentType("text/html")
;
String Buffer buf=new stringBufferO;
buf.a ppend(" < HTML>< HEAD> <TITLE>");
buf.append("Table Creation Page");
buf.append(" </TITLE> </HEAD> < BODY>");
buf.append(" <FORM
ACTION=http://netvista
METHOD=POsT>");
103: 8080/sohebl/servletl
AuthenCheck 1
buf.append("<INPUT TYPE=HIDDEN NAME=ID VALUE="+Tid+">");
buf.append("<INPUT TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append("<BR><INPUT TYPE=submit Value=Back>"+"<BR>");
buf.a ppend(" </FORM > </BODY> </HTM L>");
output. println (buf.tostring());
output.close() ;
}
}
if (surf.equals("Alistudents"))
{
liTo see all student
try
{
stmt = conn.createstatement();
15
rset = stmt.executeQuery("Select
output= res.getWriter();
res.setContentType("text/html")
S.* FROMSTUDENTS");
;
String Buffer buf=new String Buffer() ;
buf.append(" < HTML> < HEAD> <TITLE>");
buf.append("student Information Page");
buf.append(" «TITLE> «HEAD> < BODY>");
buf.append("<FORM
ACTION=http:((netvistal03:8080(sohebl(servlet(AuthenCheckl
METHOD=POsT>");
while (rset.next())
{
for(int i=1;i<=(examno+2);i++)
{
String temp="";
temp= rset.getString( i);
if(temp==null)
temp="N/A";
buf.append(temp+"
-- ");
}
buf.append(" <BR>");
}
buf.append("<INPUT TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.append("<INPUT TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append(" < BR> < BR> <INPUT TYPE=submit Value=Back>"+"<BR>");
buf.append(" </FORM > </BODY> </HTM L>");
output. println( buf. toString());
output.close() ;
rset.close() ;stmt.close();
}catch(Exception
sqlex)
{
output= res.getWriter();
output.println("<H2>Check
following errors</H2>");
output. println(sqlex);
res.setContentType("text/html")
;
StringBuffer buf=new stringBuffer();
buf.append(" < HTML>< HEAD><TITLE> ");
buf.append("Table Creation Page");
buf.a ppend(" «TITLE> </HEAD > < BODY>");
buf.append(" <FORM
ACTION= http://netvista
103: 8080/Sohebl(servlet(
AuthenCheck 1
METHOD=POST>");
buf.append("<INPUT TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
16
buf.append("<INPUT TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append(" <BR> <INPUT TYPE=Submit Value= Back>"+"< BR>");
buf.append (" </FORM > </BODY > </HTML>");
output. println( buf. toString());
output.c1ose() ;
}
}
}
public void destroy()
{
try
{
conn.close();
}catch(Exception e) {System.err.println("Problem
closing the database");}
}}
DeleteRecord.java
import java.sql.*;
import javax.swing. *;
import oracle.sql. *;
import java.io.*;
import javax.servlet. *;
import javax.servlet.http.
*;
import java.uti!. *;
import oracle.jdbc.driver. *;
/ /DeleteRecord will remove any particular user's record
public class DeleteRecord extends HttpServlet
{
Connection conn;
Statement stmt;
ResultSet rset;
public void init(ServletConfig config) throws ServletException
{
super. init( config);
conn=null;
stmt=null;
}
public void doPost(HttpServletRequest
IOException
{
PrintWriter output;
req,HttpServletResponse res) throws
17
Cookie cookies[]=null;
cookies= req .getCookies();
II Retrieving Teacher Name, ID, Student ID, Teacher's option etc.
String Tname= "", Tid = "" ,stdid = null,option = '''';
int examno=O,exam=O;
stdid = req .getPa rameter("stdid");
option = req .getPa rameter("Exa mName");
if (cookies! =null)
{
for (int i=O;i<cookies./ength;i++)
{
Cookie cookie = null;
cookie=cookies[i] ;
if( (cookie.getName()
if( (cookie.getName(»
}
.equals("Tname"» Tna me=cookie.getValue();
.equals("Tid"» Tid =cookie.getValue();
}
if( option .equals("AII"»
{
I I For deletion of the full record of a particular student
try
{
DriverManager. reg isterDriver( new oracle .jd bc.driver. OracleDriver(» ;
conn =
DriverManager.getConnection("jdbc:
Tid);
oracle: thin:@netvista103:
1521 :soh9i 1", Tname,
stmt = conn.createStatement();
rset = stmt.executeQuery("DELETE
rset.close() ;stmt.c1ose();
FROM Student WHERE ID='''+stdid+''''');
stmt = conn,createStatement();
rset = stmt.executeQuery("COMMIT");
output= res.getWriter();
output.println("<H2>Deleted
Successfully (Also shows Deleted when no match
found)</H2>");
res.setContentType("text/html")
;
String Buffer buf= new String Buffer();
buf,append (" < HTML>< HEAD> <TITLE>");
buf.append("Insertion
Creation Page");
buf.a ppend(" </TITLE> </HEAD > < BODY>");
buf,append("<FORM
ACTION=http://netvista
METHOD=POST>");
103: 8080/Soheb1/servieti
AuthenCheck1
18
buf.append("<INPUT
TYPE=HIDDEN NAME=ID VALUE="+Tid+">");
buf.append("<INPUT
TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append(" <BR> <INPUT TYPE=Submit Value= More>"+" <BR>");
buf.append(" </FORM > </BODY> </HTML>");
output. println( buf. toString(»;
output.close() ;
rset.closeO ;stmt.c1oseO;
}catch(Exception sqlex)
{
output= res.getWriter();
output.println("<H2>Check
output. println(sqlex);
following errors</H2 >");
res.setContentType("text/html")
;
StringBuffer buf=new StringBufferO;
buf.append (" < HTML>< HEAD> <TITLE >");
buf.append("Table
Creation Page");
buf.append(" </TITLE> </HEAD> < BODY>");
buf.append(" <FORM
ACTION= http://netvista
METHOD=POST>");
103: 8080/Soheb1/serviet/
AuthenCheck 1
buf.append("<INPUT
TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.append("<INPUT
TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append(" <BR><INPUT TYPE=Submit Value=Back>"+"<BR>");
buf.append("</FORM ></BODY> </HTML>");
output. println( buf.toString());
output.close() ;
}
}
else
{
try
{
/ / For deletion based on user option
DriverMa nager. registerDriver( new oracle.jd be.driver. OracleDriver(») ;
conn =
DriverManager.getConnection("jdbc:oracle:thin:
Tid);
@netvista103: 1521 :soh9i 1",Tname,
stmt = conn.createStatementO;
rset = stmt.executeQuery("UPDATE Student SET "+option+"=NULL
ID= 'II
+ stdid+ '1111);
rset.close() ;stmt.cioseO;
stmt = conn.createStatementO;
WHERE
19
rset = stmt.executeQuery("COMMIT");
output= res.getWriter();
output.println("<H2>Deleted
Successfully (Also shows Deleted when no match
found)</H2>");
res.setContentType("text/html")
;
StringBuffer buf=new StringBuffer();
buf.append(" < HTML> < HEAD> <TITLE>");
buf.append("Insertion Creation Page");
buf.append (" </TITLE > </HEAD > < BODY>");
buf.append(" <FORM
ACTION =http://netvista
103: 8080/Sohebl/servlet/
AuthenCheck 1
METHOD=POST>");
buf.append("<INPUT
TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.append("<INPUT
TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append("<BR><INPUT
TYPE=Submit Value=More>"+"<BR>");
buf.append(" </FORM > </BODY> </HTML> ");
output. println(buf. toString(»;
output.close() ;
rset.close() ;stmt.close();
}catch(Exception sQlex)
{
output= res.getWriter();
output.println("<H2>Check
following errors</H2>");
output. println(sqlex);
res.setContentType("text/html")
;
String Buffer buf=new String Buffer() ;
buf.append (" < HTML> < HEAD> <TITLE>");
buf.append("Table
Creation Page");
buf.append (" </TITLE > </HEAD > < BODY>");
buf.append(" <FORM
ACTION= http://netvista
METHOD=POST>");
buf.append("<INPUT
buf.append("<INPUT
103 :8080/Soheb 1/servlet/ AuthenCheck 1
TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append("<BR><INPUT
TYPE=Submit Value=Back>"+"<BR>");
buf.append(" </FORM > </BODY> </HTML>");
output. println(buf.toString
output.close() ;
}
}
}
}
(»;
20
Module 3
Codes for insertion and manipulation question in Exams tables
questiondata.html
<HTMl>
<HEAD>
<TITLE >lOGIN </TiTlE> </HEAD>
< BODY> < FORMACTION= http://localhost:
SOSO/Sohebl/servlet/ AuthenCheck2
METHOD=POST>
<H3>Please enter login name and identification number.</H3><BR>
<PRE>
Name: <INPUT TYPE=text NAME=Name>
ID:
<INPUT TYPE=text NAME=ID>
</PRE>
<INPUT TYPE=SUBMIT value=Submit>
< I NPUT TYPE= reset>
</FORM>
</BODY>
</HTMl>
AuthenCheck2Java
import java.sql. *;
import javax.swing. *;
import oracle.sql. *;
import java.io. *;
import javax.servlet. *;
import javax.servlet.http.
*;
import java.util. *;
import oracle.jdbc.driver. *;
//AuthenCheck2
will check for valid user in the database
public class AuthenCheck2 extends HttpServlet
{
Connection conn;
Statement stmt;
ResultSet rset;
public void init(ServletConfig
{
config) throws ServletException
21
super.init( config);
conn=null;
stmt=null;
}
public void doPost(HttpServletRequest req,HttpServletResponse res) throws
IOException
{
int i=O,exams=O,examno=O;
PrintWriter output;
/ /Tname for holding Teacher Name and Tid for holding Teacher ID
String Tname="It,Tid="";
Tname= req .getParameter("Name");
if(Tname==null)
Tname=Tname+"@";
Tid = req .getParameter("ID");
if(Tid==null) Tid=Tid+"@";
String stl,st2;
boolean identification=false;
try
{
DriverManager. reg isterDriver (new oracl e.jd bed river. OracleDriver());
conn =
DriverManager.getConnection("jdbc:
Tid);
stmt = conn.createStatement
rset = stmt.executeQuery
oracle :thin:@netvista103: 1521: soh9i 1",Tname,
();
("select D. * from dual D");
identification =true;
rset. close() ;stmt.c1ose();
}catch(Exception sqlex)
{
output= res.getWriter();
res.setContentType("text/html")
output.println("<H2>Check
output. println(sqlex);
output.c1ose() ;
}
;
following errors</H2>");
if (identification)
{
Cookie c1=new Cookie("Tname",Tname);
c1.setMaxAge( -10);
Cookie c2=new Cookie("Tid",Tid);
c2.setMaxAge( -10);
res.addCookie( c1);
22
res.addCookie(c2) ;
try
{
stmt = conn.createStatement();
rset = stmt.executeQuery("SElECT
T.* FROMTEACHERT");
rset.next() ;
examno= rset.getlnt(" Exams");
rset.c1ose();stmt.close();
}catch(Exception sqlex){}
output= res.getWriter();
res.setContentType("text/html")
;
String Buffer buf=new StringBuffer();
buf.append (" < HTMl> < HEAD><TITLE>");
buf.append("Question Manipulation Page");
buf.a ppend(" </TITlE> </HEAD> < BODY>");
buf.append(" < FORMACTION= http://netvista 103: 8080/Soheb l/servlet/Question
METHOD=POST>");
buf.append("<BR>"+"<H3>Please
Choose an Exam</H3>");
for(int j=O;j <examno;j++)
{
buf.append("<INPUT TYPE=radio NAME=Examname VAlUE=Exam"+(j+
1)+"
CHECKED>"+"Examination"+ (j+ 1)+"<BR>");
}
buf.append("<BR><BR>"+"<H4>**For
only**</H4>");
buf.append("Question No.(Integer)"+"
Deletion, question No. Required
"+"<INPUT TYPE=text NAME=questno>");
buf.append("<BR><BR>"+"Enter
Question (String)");
buf.append("<p><textarea
rows= 7 name=Quest cols=80></textarea
for(i=0;i<4;i++
> </p>");
)
{
buf.append("<BR>"+"Enter
Answer"+(i+l)+"
(String)"+"
buf.append("<INPUT TYPE=TEXTNAME=Ans"+(i+l)+"
");
SIZE=80>");
}
buf.a ppend(" < BR>" +" Enter Correct Answer No.(Integer)");
buf.append("<INPUT TYPE=text NAME=Rightans>"+"<BR> < BR>");
buf.append(" <INPUT TYPE=Submit name=Student Value=Enter>");
buf.append("<INPUT TYPE=Submit name=Student Value=Delete>");
buf.append("<INPUT TYPE=Submit name=Student Value=AIIQuestion>");
buf.append("<INPUT TYPE=Submit name=Student Value=Exit>");
buf.a ppend(" </FORM> </BODY> </HTMl> ");
output. println( buf.toString(»;
output.close() ;
Data
}
}
public void destroy()
{
try
{
conn.close();
}catch(Exception e) {System.err.println("Problem
}
}
closing the database");}
QuestionData.java
import java.sql.*;
import javax.swing. *;
import oracle.sql. *;
import java.io. *;
import javax.servlet. *;
import javax.servlet.http. *;
import java.util. *;
import oracie.jdbc.driver. *;
IIQuestionData will be used to insert questions in the Examl,
,Examn Tables.
public class QuestionData extends HttpServlet
{
Connection conn;
Statement stmt;
ResultSet rset;
public void init(ServletConfig config) throws ServletException
{
super. init( config);
}
public void doPost(HttpServletRequest req,HttpServ/etResponse res) throws
IOException
{
PrintWriter output;
Cookie cookies[]=null;
cookies= req .getCookies();
II Tname=Teacher Name,Tid=Teacher ID,questno=Question NO.,
question=Question, ansi =Answerl.. ...
Ilsurf=Option (Enter, Delete, All Questions, Exit), exam= Exam Name
String Tname="" ,Tid ='''' ,questno= null ,quest= null,ans I =null,ans2 = null,
ans3 = null,a ns4= null,surf= null,exam= nuil;
24
int examno=O,qno=O;
exa m= req .getParameter("Examname");
questno= req .getParameter("questno");
quest= req .getParameter("Quest");
ansI =req.getParameter("Ansl ");
ans2 = req .getparameter("Ans2");
ans3 = req .getParameter("Ans3");
ans4=req .getParameter("Ans4");
String rightans= req .getPara meter("Rightans");
if (cookies! =nul/)
{
for (int i=O;i<cookies.iength;i++)
{
Cookie cookie = nul/;
cookie=cookies[l] ;
if( (cookie.getName()) .equa!s("Tname")) Tname=cookle.getValue();
If( (cookie.getName()) .equals("Tid")) Tid =cookie.getValue();
}
}
try
{
DriverMa nager. reg IsterDriver( new oracle .jd be.driver. OracleDriver());
conn =
DriverManager.getConnectlon("jdbc:
Tid);
oracle :thin:@netvistal03:
1521 :soh9i 1",Tname,
stmt = conn.createStatement();
rset = stmt.executeQuery("SELECT
rset. next();
exa mno= rset.getlnt("
T. * FROMTEACHERT");
Exams");
rset.close() ;stmt.close();
}catch(Exception
sqlex){}
If( req .getPa rameter("Student")
.equals("Enter"))
if( req .getParameter("Student")
.equals("Delete"))
if( req .getParameter("Student")
if( req .getParameter("Student")
if (surf.equals("Exit"))
{
.equals("AliQuestion")) SUrf="AI/Question";
.equa Is("Exit")) surf= "Exit";
output= res.getWriter();
res.setContentType("text/html")
;
StringBuffer buf=new StringBuffer();
buf.append(" < HTML> < HEAD> <TITLE>");
buf.a ppend(" </TITLE> </HEAD > < BODY>");
surf= "Enter";
surf="Delete";
25
buf.append("<FORM
ACTION= http://netvista
METHOD=POST>");
103 :808 O/Soheb1/ servlet/ AuthenCheck2
buf.append("<H3>Please enter login name and identification number.</H3><BR>");
buf.append("Name: "+"<INPUT TYPE=text NAME=Name><BR>");
buf.append("ID:"+"
<INPUT TYPE=text NAME=ID><BR>");
buf.append("<INPUT TYPE=Submit Value=Submit>");
buf.append("<INPUT TYPE=Reset>");
buf.append(" </FORM > </BODY> </HTML>");
output. println( buf. toString(»;
output.close() ;
)
if (surf.equals("Enter"»
{
/ / For entering new question
try
{
qno= Integer. parseInt( questno);
stmt = conn.createStatement();
rset = stmt.executeQuery("INSERT
INTO
"+ exa m +" (No,Quest,Ans 1,Ans2, Ans3,Ans4,Correct)
VALUES(" +qno+",
'" + quest+ "',
,It
+ ans 1 + "','" +a ns2+ "', +ans3+ "', '" +ans4+ "','" + right
III
ans+"')");
rset.close() ;stmt.close();
stmt = conn.createStatement();
rset = stmt.executeQuery("COMMIT");
output= res.getWriter();
output. println (" <H2 >Inserted Successfully</H2 >");
res. setContentType("text/html");
String Buffer buf=new String Buffer() ;
buf.append (" < HTML>< HEAD><TITLE>");
buf.a ppend("Insertion
Creation Page");
buf.append (" </TITLE> </HEAD > < BODY>");
buf.append("<FORM
ACTION= http://netvista
METHOD=POST>");
103: 8080/Soheb 1/ servlet/ AuthenCheck2
buf.append("<INPUT TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.append("<INPUT TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append("<BR><INPUT TYPE=Submit Value=More>"+" <BR>");
buf.a ppend (" </FORM > </BODY> </HTML> ");
output.println( buf.toString(»;
output.close() ;
26
rset.closeC) ;stmt.c1oseC);
}catchCException
{
sqlex)
output= res.getWriterC);
output.printlnC"<H2 >Check following errors</H2>");
output. println Csqlex);
res.setContentTypeC"text/html")
;
String Buffer buf=new StringBuffer();
buf.appendC" < HTML> < HEAD> <TITLE >");
buf.appendC"Table Creation Page");
buf.append C"</TITLE> </HEAD > < BODY>");
buf.appendC" <FORM
ACTION = http://netvista
METHOD=POST>");
buf.appendC"<INPUT
103: BOBO/Soheb 1/ servlet/ AuthenCheck 1
TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.appendC"<INPUT TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.appendC"<BR><INPUT
TYPE=Submit Value=Back>"+"<BR>");
buf.appendC" </FORM > </BODY> </HTML> ");
output. printlnCbuf.toStringC»;
output.closeC) ;
}
}
if Csurf.equalsC"Delete"»
{
/ / For deletion of question
try
{
qno= Integer. parseIntC questno);
output= res.getWriterC);
res.setContentTypeC"text/html")
;
String Buffer buf=new StringBuffer();
buf.append C"< HTML> < HEAD> <TITLE> ");
buf.appendC"Deletion
Creation Page");
buf.append C"</TITLE> </HEAD > < BODY>");
buf.appendC" <FORM
ACTION = http://netvista
METHOD=POST>");
buf.appendC"<INPUT
103: BOBO/Sohebl/servlet/DeleteQuestion
TYPE=radio NAME=Answer VALUE=AII>"+"AII"+"<BR>");
forCint j=0;j<4;j++)
{
buf.appendC" <INPUT TYPE=radio NAME=Answer VALUE=Ans"+Cj+ 1)+"
CHECKED>"+"Answer"+Cj+
1)+"< BR>");
27
}
buf.append("<INPUT TYPE=radio NAME=Answer VAlUE=Correct" +"
CHECKED>"+"Corr. Ans."+"<BR>");
buf.append("<BR>New Value for insertion (Default is null)<BR>");
buf.append("<INPUT
buf.append("<INPUT
buf.append("<INPUT
buf.append("<INPUT
TYPE=TEXT NAME=New sIZE=80>");
TYPE=HIDDEN NAME=ID VAlUE="+ Tid+">");
TYPE=HIDDEN NAME=Name VAlUE="+ Tname+" >");
TYPE=HIDDEN NAME=questno VAlUE="+questno+">");
buf.append("<INPUT TYPE=HIDDEN NAME=Examname VAlUE="+exam+">");
buf.append(" <BR> < BR> <INPUT TYPE=submit Value= Done>"+"<BR>");
buf.append (" </FORM > </BODY> </HTML>");
output. println(buf. tostring());
output.c1ose() ;
}catch(Exception
sqlex)
{
output= res.getWriter();
output.println("<H2>Check
following errors</H2 >");
output. println(sqlex);
res.setContentType("text/html")
;
String Buffer buf=new stringBuffer();
buf.append (" < HTMl> < HEAD><TITLE>");
buf.append("Table Creation Page");
buf.append(" </TiTlE > </HEAD > < BODY>");
buf.append (" < FORM
ACTiON = http://netvista
103: 8080/sohebl/servlet/
AuthenCheck2
METHOD=POsT>");
buf.append("<INPUT TYPE=HIDDEN NAME=ID VAlUE="+ Tid+">");
buf.append("<INPUT TYPE=HIDDEN NAME=Name VAlUE="+ Tname+">");
buf.append(" <BR><INPUT TYPE=submit Value=Back>"+"<BR>");
buf.a ppend(" </FORM > </BODY> </HTMl> ");
output. println(buf.tostring());
output.close() ;
}
}
if (surf.equals("AIiQuestion"))
{
try
{
/ / will show all question
stmt = conn .createstatement ();
rset = stmt.executeQuery("select
output= res.getWriter();
* FROM"+exam+" where No<lOOOO");
28
res.setContentType("text/html")
;
StringBuffer buf=new StringBuffer();
buf.append(" < HTML>< HEAD><TITLE >");
buf.append("Student Information Page");
buf.a ppend(" </TITLE> </HEAD > < BODY>");
buf.append(" <FORM
ACTION= http://netvista
METHOD=POST>");
while (rset.next())
{
String temp="";
103: 8080/Soheb 1/servlet/ AuthenCheck2
buf.append("Q" + rset.getInt( 1)+") ");
temp= rset.getString (2);
if(temp= =null) temp="N/ A";
buf.append (temp+" < BR>");
for(int i=3;i<=6;i++)
{
temp="";
temp= rset.getString( i);
if(temp= =null) temp="N/ A";
buf.append("Ans"+(i-2)+")
}
"+temp+" < BR>");
temp= rset.getString(7);
if(temp==null)
temp="Correct - N/A";
else temp="Correct - Ans"+temp;
buf.append (temp+" < BR>");
buf.append(" <BR>");
}
buf.append("<INPUT TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.append("<INPUT TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append(" <BR> <BR><INPUT TYPE=Submit Value=Back>"+" <BR>");
buf.a ppend(" </FORM > </BODY > </HTML>");
output. println( buf.toString());
output.c1ose() ;
rset.close() ;stmt.close();
}catch(Exception sqlex)
{
output= res.getWriter();
output.println("<H2>Check
output.printin(sqlex) ;
following errors</H2>");
res.setContentType("text/html")
;
29
String Buffer buf=new StringBuffer();
buf.append(" < HTML>< HEAD> <TITLE> ");
buf.append("Table Creation Page");
buf.append(" </TITLE> </HEAD> < BODY>");
buf.append("<FORM
ACTION= http://netvista
METHOD=POST>");
103: 8080/Soheb l/servlet/ AuthenCheck2
buf.append("<INPUT TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.append("<INPUT TYPE=HIDDEN NAME=Name VALUE="+Tname+">");
buf.append("<BR><INPUT TYPE=Submit Value=Back>"+"<BR>");
buf.append(" </FORM > </BODY> </HTM L>");
output. printin (buf.toString ());
output.close() ;
}
}
}
}
DeleteQuestion.java
import java.sql. *;
import javax.swing.*;
import oracle.sql. *;
import java.io. *;
import javax.servlet. *;
import javax.servlet.http.
*;
import java.util. *;
import oracle.jdbc.driver. *;
// DeleteQuestion will delete and manipulate questions in the Examl, .... ,Examn _
Tables
public class DeleteQuestion extends HttpServlet
{
Connection conn;
Statement stmt;
ResultSet rset;
public void init(ServletConfig config) throws ServletException
{
super.init( config);
}
public void doPost(HttpServletRequest
IOException
{
req,HttpServietResponse res) throws
30
PrintWriter output;
Cookie cookies[J=null;
cookies= req.getCookies();
// Retrieving Teacher Name, ID, Exam Name, Question No etc.
String Tname="" ,Tid ="" ,option = "" ,exam =n ull,newval = null;
int questno=O;
questno= Integer. parseInt( req .getParameter("questno"));
option = req .getParameter(" Answer");
//option holds particular columns identification for removing
exam = req .getParameter("Examna me");
newval = req .getPara meter("New");
try
{
questno= Integer.parseInt(req .getPara meter("q uestno"));
}catch(NumberFormatException
e)
{
output= res.getWriter();
output.println(" <H2>Check following errors</H2>");
output. println (e);
res.setContentType("text/html")
;
String Buffer buf=new StringBuffer();
buf.append(" < HTML> < HEAD> <TITLE>");
buf.append("Table
Creation Page");
buf.a ppend(" </TITLE > </HEAD > < BODY>");
buf.append(" <FORM
ACTION =http://netvista
METHOD=POST>");
buf.append("<INPUT
buf.append("<INPUT
103: 8080/Sohebl/servlet/
AuthenCheck2
TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append("<BR> <INPUT TYPE=Submit Value=Back>"+"
buf.append(" </FORM > </BODY > </HTML> ");
<BR>");
output. println (buf.toString());
output.close() ;
}
if (cookiesl =null)
{
for (int i=O;i<cookies.length;i++)
{
Cookie cookie = null;
cookie=cookies[i]
;
if( (cookie.getNa me()) .equals("Tna me")) Tna me=cookie.getValue();
if( (cookie.getName()) .equals("Tid")) Tid =cookie.getValueO;
31
}
}
if( option.equals("AII"»
{
/ / For deletion of the full record of a particular question
try
{
DriverManager. reg isterDriver( new oracle .jd be.driver. OracleDrive r(» ;
conn=
DriverManager.getConnection ("jdbc: oracle :thin:@netvista103:
Tid);
1521: soh9i 1",Tname,
stmt = conn.createStatement();
rset = stmt.executeQuery("DElETE
No<10000");
rset.close() ;stmt.close();
FROM"+exam+"
WHERENo="+questno+"
stmt = conn.createStatement();
rset = stmt.executeQuery("COMMIT");
output= res.getWriter();
output.println("<H2>Deleted
found)</H2>");
Successfully (Also shows Deleted when no match
res. setContentType( "text/html");
String Buffer buf=new StringBuffer();
buf.a ppend(" < HTMl> < HEAD><TITLE>");
buf.append("Insertion
Creation Page");
buf.append (" </TITlE> </HEAD > < BODY>");
buf.append("<FORM
ACTION= http://netvista
METHOD=POST>");
103: 8080/Soheb 1/ servlet/ AuthenCheck2
buf.append("<INPUT TYPE=HIDDEN NAME=ID VAlUE="+ Tid+" >");
buf.append("<INPUT TYPE=HIDDEN NAME=Name VAlUE="+Tname+">");
buf.append("<BR> <INPUT TYPE=Submit Value=More>"+"< BR>");
buf.append (" </FORM > </BODY > </HTMl>");
output. println( buf.toString(»;
output.c1ose() ;
rset.close() ;stmt.c1ose() ;conn .close();
}catch(Exception sqlex)
{
output= res.getWriter();
output.println(" <H2 >Check following errors</H2 >");
output. println(sqlex);
res.setContentType("text/html")
;
String Buffer buf= new String Buffer();
AND
buf.a ppend(" < HTML> < HEAD> <TITLE>");
buf.append("'Table Creation Page");
buf.append(" </TITLE > </HEAD > < BODY>");
buf.append("<FORM
ACTION= http://netvista
METHOD=POST>");
buf.append("<INPUT
103: BOBO/Soheb l/servlet/ Authen Check2
TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.append("<INPUT TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append("<BR> <INPUT TYPE=Submit Value=Back>"+"<BR>");
buf.append (" </FORM > </BODY > </HTM L>");
output. println( buf.toString());
output.close();
}
}
else
{
try
{
/ / For deletion based on user option
DriverManager. registerDriver(new
conn =
oracle.jdbc.driver.OracleDriver());
DriverManager.getConnection("jdbc:
Tid);
oracle :thin:@netvista103:
1521 :soh9i 1",Tna me,
stmt = conn.createStatement();
rset = stmt.executeQuery("UPDATE
"+exam+"
SET "+option+"="'+newval+'"
WHERE NO="+Questno+" AND No< 10000");
rset.close() ;stmt.close();
stmt = conn.createStatement();
rset = stmt.executeQuery("COMMIT");
output= res.getWriter();
output.println("<H2>Deleted
Successfully (Also shows Deleted when no match
found)</H2>");
res. setContentType( "text/html") ;
StringBuffer buf=new StringBuffer();
buf.append(" < HTML> < HEAD> <TITLE>");
buf.append("Insertion
Creation Page");
buf.append (" </TITLE> </HEAD> < BODY>");
buf.append(" <FORM
ACTION= http://netvista
103: BOBO/Soheb1/servlet/ AuthenCheck2
METHOD=POST>");
buf.append("<INPUT
TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.append("<INPUT
TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
33
buf.append(" <BR> <INPUT TYPE=submit Value=More>"+"<
BR>");
buf.a ppend(" </FORM > </BODY> </HTML>");
output. printl n(buf.tostring());
output.close() ;
rset.close() ;stmt.close();
}catch(Exception sqlex)
{
output= res.getWriter();
output.println(" <H2>Check following errors</H2 >");
output. pnntln(sqlex);
res.setContentType( "text/html");
String Buffer buf=new stringBuffer();
buf.a ppend(" < HTML> < HEAD><TITLE>");
buf.append("Table Creation Page");
buf.append(" </TITLE> </HEAD > < BODY>");
buf.append("<FORM
ACTION=http://netvista 103: 8080/soheb1/servlet/ AuthenCheck2
METHOD=POsT>");
buf.append("<INPUT TYPE=HIDDEN NAME=ID VALUE="+ Tid+">");
buf.append("<INPUT TYPE=HIDDEN NAME=Name VALUE="+ Tname+">");
buf.append(" <BR><INPUT TYPE=submit Value=Back>"+" <BR>");
buf.append (" </FORM > </BODY> </HTML>");
output. println( buf.tostring());
output.close() ;
}
}
}
}
34
Module 4
Codes for giving and evaluating
examinations
exam.html
<HTMl>
<HEAD>
<TITLE> lOGIN </TITlE> </HEAD >
< BODY> < FORM ACTION= http://ahmed
:8080/Sohebl/servlet/loginCheck
METHOD=POST>
<PRE>
Name: <INPUT TYPE=text NAME=Name>
10:
<INPUT TYPE=text NAME=ID>
</PRE>
<INPUT TYPE=SUBMIT value=Submit>
<INPUT TYPE=reset>
</FORM>
</BODY>
</HTMl>
LoginCheck.java
import java.io. *;
import javax.servlet. *;
import javax.servleLhttp.
*;
import java.sql. *;
/ /loginCheck will check for valid user in the database
public class loginCheck extends HttpServlet
{
Connection c;
Statement s;
ResultSet rs;
public void init(ServletConfig
config) throws ServletException
{
super.init( config);
}
public void doPost(HttpServletRequest
Serv Iet Excepti on, 10Excepti 0 n
{
req,HttpServletResponse
res) throws
35
int i=O,exams;
PrintWriter output;
String name=tI",id="";
name= req .getParameter("Name");
if(name==null) name=name+"@";
id = req .getParameter("ID");
if(id==null) id=id+"@";
String stl ,st2;
rs=null;
try
{
DriverManager. registerDriver (new oracie.jd bc.driver.OracieDriver());
c
=
DriverManager.getConnection("jdbc:
oracle :thin:@netvista103:
1521: soh9i 1", "scott"
,"tiger");
s=
c.createSta tement( ResuItSet. TYPE_SCROLL_SENSITIVE,ResultSet. CONCUR_UPDAT
ABLE);
rs=s.executeQuery("Select
}catch(Exception sqlex)
{
NAME,ID from Student");
output= res.getWriter();
res.setContentType("text/html")
output.println("
;
<H2>Check following errors</H2>");
output. println(sqiex);
output.close() ;
}
//start
try
of Block-1
{
rS.next();
/ /start of Block-2
/* variable i will hold the value whether a match is found or not.
name and id variable will read user's name and id. Every record in the database will
be checked. If any record matches looping will be terminated. */
outer: do
{
stl =rs.getString("ID");
st2 = rS.getString("NAME");
/ /name and id cookies will carry name and id of an user.
if (stl.equals(id)
{
&& st2.equals(name))
36
Cookie c1=new Cookie( 'name",name);
c1.setMaxAge( -10);
Cookie c2=new Cookie("id",id);
c2.setMaxAge( -10);
res.addCookie(c1) ;
res.addCookie(c2) ;
i=l;
break outer;
}
}while( rs. next());
Ilend of Block-2
Iistart
of Block-3
I*if user match is found it check Teacher database to see how many examination is
designed for a subject and will
give radio button option to choose one. *1
if(i==l)
{
rS.close(); s.close();
s
=
c.createSta tement( ResuItSet. TYPE_SCROLL_SENSITIVE, ResultSet. CONCUR_UPDAT
ABLE);
rs=s.executeQuery("Select
rS.next();
Ilexams
T. * from Teacher T");
variable will store number of examination designed for a subject.
exams= rs.getInt("Exams");
res.setContentType("text/html")
;
output= res.getWriter();
String Buffer buf=new StringBuffer();
if (exams>O)
{
buf.a ppend(" < HTML> < HEAD> <TITLE> ");
buf.append("Examination
Start Page");
buf.append(" </TITLE> </HEAD> < BODY>");
buf.append(" < FORM ACTION= http://netvista
METHOD=POST>");
buf.append("Login
103: 8080/Soheb 1/servlet/GetExam
Name: "+name+"<BR>"+"Login
buf.append("<H3>Choose
for(int j=O ;j<exams;j++)
{
buf.append("<INPUT
ID: "+id+"<BR><BR>");
an Examination from given below.</H3>");
TYPE=radio NAME=ExamName
VALUE=Exam"+(j+ 1)+" >"+"Examination"+
(j+ 1)+"<BR>");
.
37
}
buf.append("<H4>Press
Submit Button to continue.</H4>"+"<BR>");
buf.append("<INPUT TYPE=submit VALUE=Submit>");
buf.a ppend(" </FORM > </BODY> </HTM L>");
output. println( buf.toString(»;
output.close() ;
}
IIIf no examination is designed, following else block will work
Ileise Block of Block-3
else
{
output= res.getWriter();
res.setContentType("text/html")
;
buf=new StringBufferO;
output.println("<H2>No
examination for you</H2>");
output.close() ;
}
}
I lend of Block-3
IIIf no match found for name and id in the database
work
following else block will
Ileise Block of Block-2
else
{
output= res.getWriter();
res.setContentType("text/html")
;
String Buffer buf=new StringBufferO;
buf.a ppend (" < HTML> < HEAD> <TITLE >");
buf.append(" </TITLE > </HEAD > < BODY>");
buf.append (" < FORMACTION= http://netvista
METHOD=POST>");
103: 8080/Sohebl/servlet/LoginCheck
buf.append("<H2>Login failed, Re Enter your login name and
!D. </H2><BR> < BR>"):
buf.append("Name"+"<INPUT
buf.append("
TYPE=text NAME=Name>"+"<BR>");
!D"+"<INPUT TYPE=password NAME=!D>"+"<BR>");
buf.append("<BR>"+"<INPUT
buf.append("<INPUT
TYPE=reset>");
buf.append (" <I FORM> </BODY>
output. println( buf. toString(»;
output.close() ;
}
c.closeO;
TYPE=SUBMIT VAlue=Submit>");
</HTML> ");
38
}catch (SQLException sqlex) {System.out. println(sqlex); sqlex. printStackTrace();}
Ilend of Block-l
}
public void destroy()
{
try
{
c.close();
}catch(Exception e) {System.err.println("Problem
}
}
closing the database");}
GetExam.java
import java.io. *;
import javax.servlet. *;
import javax.servlet.http.
*;
import java.util. *;
import java.sql.*;
import java.net. *;
import java.applet. *;
1* GetExam will take input from LoginCheck and will give the user no. of question
per page option.1t will check for unprepeared examination table, question table
without any question and whether user is trying to give a previousely given
examination. *j
public class GetExam extends HttpServlet
{
Connection c;
Statement s;
ResultSet rs;
public void init(ServletConfig config) throws ServletException
{
super.init( config);
}
public void doPost(HttpServletRequest req,HttpServletResponse res)
throws ServletException, IOException
{
PrintWriter output;
Cookie cookies[]=null;
cookies= req .getCookies();
String name= null,id =n t..1I,nullcheck=null,exa m = null;
39
/ /qsno(] will hold the identification of randomely choosen questions.
int qsno[]=new
int(5],rand=O,rowno=O;
//exam variable take users input from LoginCheck
exa m= req .getParameter("ExamName");
if (cookies! =null)
{
for (int i=O;i<cookies.length;i++)
{
Cookie cookie = null;
cookie=cookies(i] ;
if( (cookie.getName()
.equals("name"»
if( (cookie.getName(»
}
}
.equals("id"»
name=cookie.getVa lue();
id =cookie.getValue();
/ /start of Block-1
/ /this block will check wheather user is here without choosing an examination in
LoginCheck.
if (exam! =null)
{
try
{
DriverManager. registerDriver (new oracle.jdbc.driver.OracleDriver();
c =
DriverManager.getConnection("jdbc:
"tiger");
oracle :thin:@netvista103:
1521: soh9i 1", "scott"
I
s
=
c.createStatement( ResuItSet. TYPE_SCROLL_SENSITIVE,ResultSet. CONCUR_UPDAT
ABLE);
rs=s.executeQuery("Select
/ /rowno holds no. of rows
while(rs.next())
{
E.* from "+exam+"
rowno++;
}
/ /start of Block-2
if (rowno< =0)
{
res.setContentType("text/html")
output= res.getWriter();
;
String Buffer buf= new String Buffer();
buf.a ppend(" < HTML> < HEAD> <TITLE>");
E");
40
buf.append("Examination
buf.append("
Page");
</TITLE>
buf.append("Login
</HEAD>
Name:
"+ id +" < BR >" +exam+"
< BODY>");
"+name+"<BR>"+"Login
< BR> <BR >");
buf.append("
<H3 >No available
buf.append("
</FORM > </BODY> </HTM L>");
output. println(buf.toString
output.c1ose()
ID:
question
for this examination.
</H3 >");
();
;
}
else if (rowno==l)
{
qsno=new
int[l];
qsno[O]=l;
}
else
/ /while
rowno
is more than one
{
do
{
rand = (int) (Math .random( )*rowno);
}while(rand!=O
&& rand>=rowno);
int I=rand;
int m=rand+l;
int k=O;
qsno=new
int[rowno];
try
{
rs.close()
s
;s.c1ose();
=
c. createStatement(
Resu ItSet. TYPE_SCROLL_SENSITIVE,
ABLE);
rs=s.executeQuery("Select
rs.next()
;
}catch (Exception
sqlex){sqlex.printStackTrace();}
rS.a bsolute(I);
do
{
qsno[k]=I;
k++;
1-- ;
}while( rS.previous(»;
rS.absolute(m)
do
E.* from "+exam+"
;
E");
ResultSet. CONCU R_ UPDAT
41
{
qsno(k]=m;
k++;
m++;
}while( rs.next());
}
fiend of Block-2
/ /qid holds qsno as a String, 50 to send in a cookie
String qid=new String();
for(int p=O;p<qsno.length;p++)
{
qid+=qsno(p];
qid+='a';
}
Cookie c2=new Cookie("qid",qid);
c2.setMaxAge( -10);
//Cookie
res.addCookie( c2);
}catch(Exception
sqlex) {
res.setContentType("text/html")
;
output= res.getWriter();
StringBuffer buf=new StringBuffer();
buf.append (" < HTMl> < HEAD><TITLE>");
buf.append("Examination
Page");
buf.append(" </TITlE> </HEAD> < BODY>");
buf.append("login Name: "+"<BR>"+"login
ID:
"+ id +" < BR>" + exam+" < BR> <BR>");
buf.append("<H3>No available question for this examination.</H3>");
buf.append(" </FORM > </BODY> </HTMl>");
output.println( buf.toString());
output.close() ;
}
try
{
rS.close(); s.close();
s=
c.createStatement( ResuItSet. TYPE_SCROll_SENSITIVE, ResuitSet. CONCUR_UPDAT
ABLE);
rs=s.executeQuery("Select
rS.next();
S.* from Student S WHEREID="'+id+""');
/* nullcheck will check wheather the exam has given before from exam column in
Student table.
42
check will be done for a particular exam (exam choosen by an student)//
examination has
every
an exam column in Student table. */
nullcheck= rS.getString( exam);
}catch(SQLException sqlex) {System. out. println (sqlex); sqlex. printStackTrace();}
//nullcheck==null
means examination has not given before
/ /start of Block-3
if (nullcheck==null)
{
Cookie cl=new Cookie("exam",exam);
cl.setMaxAge( -10);
//Cookie
res.addCookie(cl) ;
String rownol=''''+rowno;
Cookie c2=new Cookie("rowno" ,rownol);
c2.setMaxAge( -10);
/ /Cookie
res.addCookie(c2) ;
res.setContentType("text/html")
output= res.getWriter();
;
String Buffer buf=new StringBuffer();
buf.a ppend (" < HTML>< HEAD> <TITLE>");
buf.append("Examination Page");
buf.append(" </TITLE> </HEAD> < BODY>");
buf.append(" < FORMACTION= http://netvista
METHOD=POST>");
103 :8080/Sohebl/servlet/GetMessage
buf.append("Login Name: "+name+"<BR>"+"Login
"+id+" <BR>"+exam+"
10:
<BR> <BR>");
buf.append("<H4>Total number of question is "+rowno+"</H4>");
buf.append("<BR>"+"<H3>How
many question per page?</H3>");
buf.append("<INPUT TYPE=radio NAME=QperPage VALUE=5>"+"5"+"<BR>");
buf.append("<INPUT TYPE=radio NAME=QperPage VALUE=10
CHECKED>"+" 10"+"<BR>");
buf.append(" <INPUT TYPE=radio NAME=QperPage VALUE=15>"+" 15" +"<BR>");
buf.append("<INPUT TYPE=radio NAME=QperPage
VALUE=20 >" +" 20" +" < BR> < BR>");
buf.append("<H3>Press
Start button to proceed.</H3>");
buf.append("<INPUT TYPE=Submit VALUE=Start>");
buf.append(" </FORM > </BODY> </HTML>");
output. println(buf.toString());
output.c1ose() ;
}
else
{
43
output= res.getWriter();
String Buffer buf=new StringBuffer();
buf.append (" < HTMl> < HEAD> <TITLE >");
buf.append("Examination Start Page");
buf.a ppend(" </TITlE > </HEAD > < BODY>");
buf.append("login Name: "+name+"<BR>"+"login
"+id+ "<BR>"+exam+"<BR> <BR> <H2 >");
ID:
buf.append("This exam has been given before, try another."+"<BR>");
buf.append(" </H2 > </BODY> </HTMl>");
output. println (buf. toString());
output.close() ;
}
/ lend of Block-3
} I/else Block of Block-l
/* following block will execute if user doesn't choose any exam in loginCheck. It
will
force an user to choose an examination*1
else
{
output= res.getWriter();
String Buffer buf=new StringBuffer();
buf.append(" < HTMl> < HEAD> <TITLE> ");
buf.append("Examination
Start Page");
buf.append(" </TITlE> </HEAD> < BODY>");
buf.append(" < FORMACTION= http://netvista
103: 8080/Soheb l/servlet/loginCheck
METHOD=POST>");
buf.append("login Name: "+name+"<BR>"+"login
ID: "+id+"<BR><BR><H2>");
buf.append("Please go to prvious pagess and choose an
Examination. "+" <BR> <BR>");
buf.append("<INPUT TYPE=HIDDEN NAME=ID VAlUE="+id+">");
buf.append("<INPUT TYPE=HIDDEN NAME=Name VALUE="+name+">");
buf.append("<INPUT TYPE=SUBMIT NAME=button VAlUE=Previous>");
buf.append(" </H2 > </BODY > </HTMl>");
output.println (buf.toString());
output.closeO;
} / /End of Block-l
}
public void destroyO
{
try
{
c.c1oseO;
44
}catch(Exception
}
}
e) {System.err.println("Problem
closing the database");}
GetMessage.java
import
import
import
import
import
import
java.io.*;
javax.servlet. *;
javax.servlet.http.
java.util.*;
java.sql.*;
java.net.*;
*;
import java.applet. *;
/* GetMessage will retrieve information from GetExam regarding question per page.
It will initiate some cookies with default vaiue to use in next stages. */
pubiic class GetMessage extends HttpServlet
{
public void doPost(HttpServletRequest
Servl et Excepti on, I OExcepti 0 n
{
req,HttpServietResponse res) throws
PrintWriter output;
int rowno=O;
String name=null,id=null,exam=null;
String qperpage= req .getPara meter("QperPage");
/* qperpage means question per page, exam holds examination name, rowno holds
total rowno in a particular exam table */
String qanswerl ="";
Cookie cookies[J=null;
cookies= req .getCookies();
if (cookies! =null)
{
for (int i=O;i<cookies.length;i++)
{
Cookie cookie = null;
cookie=cookies[i] ;
if( (cookie.getName()) .equals("name"))
name =cookie.getValue();
if( (cookie.getName()) .equals("id")) id =cookie.getValue();
if( (cookie.getName()) .equals("exam")) exam =cookie.getValue();
if( (cookie.getName() ).equals(" rowno"))
rowno= Integer. parselnt( cookie.getValue());
}
}
45
Cookie c=new Cookie("qperpage",qperpage);
c.setMaxAge( -10);
res.addCookie( c);
/* qanswer cookie is designed to hold default answer for every question page. In
the next stages during opening a page, cookie for that particular page will be
searched first. This default cookies for every page will help to initiate the page for
the first time */
for(int i=O; i«Integer.parseInt(qperpage));
i+ +) qanswerl + =null+"a";
fort int i=0; i< « rowno/Integer. parseInt( qperpage))+ 1); i+ +)
{
String cookname="qanswer"+(i+2);
Cookie cl =new Cookie(cookname,qanswerl);
c l.setMaxAge( -1 0);
res.addCookie(cl) ;
}
/* traceval cookie is designed to identify every page identically. Starting value has
given 1, so to get calculation advantages in the next stages.*/
Cookie c2=new Cookie("traceval","I");
c2.setMaxAge( -10);
res.addCookie( c2);
fiend cookie will hold the ending question number for every page.
Cookie c3=new Cookie("end",(""+O));
c3.setMaxAge( -10);
res.addCookie(c3) ;
res.setCon tentType( "text/html");
output= res.getWriter();
String Buffer buf=new String Buffer();
buf.a ppend(" < HTML>< HEAD> <TITLE>");
buf.append("Examination
Start Page");
buf.append(" </TITLE > </HEAD > < BODY>");
buf.append("<FORM
ACTION= http://netvista 103: 8080/Sohebl/servlet/GetQuestAns
buf.append("Login Name: "+name+"<BR>"+"Login
ID:
"+ id+" < BR>" +exa m+" < BR> <BR>");
buf.append("<H3>If
METHOD=GET> ");
you face any problem, talk with your teacher.</H3>");
buf.append("<H4>Press Next Button to start examination.</H4>"+"<BR>");
buf.append("<INPUT TYPE=HIDDEN NAME=TRACEVALVALUE=1 >");
buf.append("<INPUT
TYPE=SUBMIT NAME=SURF VALUE=Exit>");
buf.append("<INPUT
TYPE=SUBMIT NAME=SURFVALUE=Next>");
buf.append(" </FORM > </BODY> </HTM L>");
output. println (buf. toString());
output.close() ;
46
}
}
GetQuestAns.java
import
import
import
import
import
java.io. *;
javax.servlet. *;
javax.servlet.http.
java.util. *;
java.sql.*;
*;
import java.net.*;
import java.applet. *;
import java.text.DecimaIFormat;
/* GetQuestAns will generate questions randomly, after submission will calculate
score and will update the Student database */
public class GetQuestAns extends HttpServlet
{
Connection c;
Statement s;
ResultSet rS,rsl;
public void init(ServletConfig config) throws ServletException
{
super. init( config);
}
public void doGet(HttpServletRequest
req,HttpServletResponse res)
throws ServletException, IOException
{
PrintWriter output;
String surf='''',sohlO='''';
int traceval =Integer. parseInt(req .getParameter("TRACEVAL"));
if( req .getParameter("SURF") .equals(" Next")) surf="Next";
if( req .getParameter("SURF") .equaIs("Previous")) surf=" Previous";
if( req .getParameter("SURF") .equals("Submit")) surf= "Submit";
if( req .getParameter("SURF") .equa1st"Exit")) surf= "Exit";
//Three conditions may arise, moving next,previous or submitting for score
/* traceval will hold identification number of each page, tracevall
traceval.
is identical to
In case of previous butoon traceval for the intended page is always (traceval-2)
where traceval is of calling point*/
47
/* Answer holding cookie for a page has always value(traceval+ 1), cause cookie for
any page is generated in the next page, qanswer1 retreive answer value from
cookie as string for a particular page and transfer to integer value inqans[]*/
//qans stores answer value from previous page, qid[] holds question identification
value for an user
/ /default cookie of every
for a page
//start of Block-1
if (surf.equals("Next")
page from GetMessage will work when no cookie is found
II surf.equals("Previous"»
{
int traceval1 =traceval;
if(surf.equals("Previous"»
traceval =traceval-2;
String name=nulI,id=nulI,exam=null,qanswer="",qanswer1
="";
String qid 1=n ull,qans1 ,st2,st3,st4,st5,st6;
Cookie cookies[]=null;
cookies = req .getCookies();
int qperpage=O,rowno=O,stl
int qid[]=new int[O];
if (cookiesl =null)
{
=O,end =O,start=O,qans[]=new
int[O];
for (int i=O;i<cookies.length;i++)
{
Cookie cookie = null;
cookie=cookies[i] ;
if( (cookie.getName() ).equals("name"»
name=cookie.getValue();
if( (cookie.getName() ).equals("id"» id =cookie.getValue();
if( (cookie.getName(» .equals("q perpage"»
qperpage= Integer. parseInt( cookie.getValue(»);
if( (cookie.getName(» .equals("qid"» qid 1=cookie.getValue();
if( (cookie. 9etNa me(». equaIs(" rowno"»
rowno= Integer. parseInt( cookie.getValue(»;
if( (cookie.getName(» .equals("exam"»
exam=cookie.getValue();
II Get answer cookie for a page first (default from GetMessage may work)
String temp="";
temp="qanswer" + (traceval
+ 1);
if( (cookie.getNa me()) .equals(temp»
}
qanswer1 =cookie.getValue();
}
qid=new int[rowno];
I I Transform question serial from string to integer
int temp=O;
for(int i=O;i<rowno;i++)
48
{
String str="";
do
{
str+ =qid l.charAt(temp);
temp++;
} while( qid l.charAt(temp)! =' a');
qid[i] =Integer. parselnt(str);
temp++;
}
I I get previous page's answer as string and store in qanswer
if (tracevall>l)
{
int end I = «tracevall-1 )*qperpage)-I;
int startl=(endl+I)-qperpage;
String tempI ='''';
for(int i=startl;i<=endl;i++)
{
tempI + = req.getParameter("Q"+ (i+ I));
templ+="a";
}
qanswer+ =templ;
}
Ilend holds the end value (serial no.) of question for a particular page
Iistart
holds the start value (serial no.) of question for a particular page
end = (traceval*qperpage)-I;
start= (end + I )-qperpage;
if( end> = rowno) end = rowno-I;
Iino. of answers Is always equal to qperpage for any page
Ilretrieve
answer cookie value as integer in qans[], if any value null [unchecked]
assign 99.
qans=new int[qperpage];
temp=O;
for(int i=O;i<qperpage;i++)
{
String strl="";
do
{
stri + =qanswerl.charAt(temp);
temp++;
}while(qanswerl.charAt(temp)!
='a');
49
if (str1.equals("null"))
{
qans[i]=99;
}
else
{
qans[i] = Integer. parseInt(strl);
}
temp++;
}
try
{
DriverManager. registerDriver (new oracle.jdbc.driver.OracieDriver());
c =
DriverManager.getConnection("jdbc:
"tiger");
oracle :thin:@netvistal03:
1521: soh9i 1", "scott"
I
s=
C. crea teStatemen
t( ResuItSet. TYPE_SCROll_SEN SITIVE, ResultSet. CONCUR_UPDAT
ABLE);
rs=s.executeQuery("Select
E.* from "+exam+"
//decission to make by (end==rowno-l)for
E");
showing submit button
if (end==rowno-l)
{
String cookname="qanswer"Hracevall;
Cookie c=new Cookie(cookname,qanswer);
c.setMaxAge( -10);
res.addCookie(c);
res.setContentType("text/html")
output= res.getWriter();
;
String Buffer buf=new StringBuffer();
temp=traceval+
1;
buf.a ppend(" < HTMl> < HEAD> <TITLE>");
buf.append("Examination Page");
buf.append (" </TITlE> </HEAD > < BODY>");
buf.append("login Name: "+name+"<BR>"+"login
buf.append(" <FORM
ACTION=http://netvista
int templ=O;
10: "+id+"<BR>"+"<BR>");
103: 8080/Sohebl/servlet/GetQuestAns
for(int i=start;i<=end;i++)
{
String checkl="
",check2=" ",check3=" ",check4=" ";
METHOD=GET>");
50
if (qans[temp1]>0
&& qans[temp1]<S)
{
if(qans[temp1]=
= 1) check1 =check1 + "CHECKED";
if(qans[temp1]=
if(qans[temp1]=
=2) check2=check2+"CHECKED";
=3) check3=check3+"CHECKED";
if(qans[temp1 ]==4) check4=check4+ "CHECKED";
}
rS.absolute( qid [i]);
stl =rs.getInt(" No");
st2 =rs.getString("Quest");
st3 = rs.getString("Ans1 ");
st4=rs.getString
("Ans2");
stS = rs.getString("Ans3");
st6=rs.getString("Ans4") ;
if(st2 = = null)st2 = "Unassigned";
if(st3 = = null )st3= "Unassigned";
if(st4= =null)st4="Unassigned";
if(stS = = null )stS = "Unassigned";
if(st6= =null)st6="Unassigned";
buf.append("Q"+(i+
buf.append("<INPUT
1)+".
"+st2+"<BR>");
TYPE=radio NAME="+ "Q"+ (i+ 1)+"
VALUE=" +" 1"+check1 +" >" +st3+" < BR>");
buf.append("<INPUT TYPE=radio NAME=" +"Q"+(i+ 1)+"
VALUE=" +" 2" + check2+" >" +st4+" < BR>");
buf.append(" <INPUT TYPE=radio NAME="+"Q"+(i+ 1)+"
VALUE=" + "3" +check3+" >" +stS +" < BR>");
buf.append("<INPUT
TYPE=radio NAME="+"Q"+(i+1)+"
VALUE=" + "4" +check4+" >" +st6+" < BR> < BR>");
temp1++;
}
buf.append("<INPUT
TYPE=HIDDEN NAME=TRACEVALVALUE="+temp+">");
/ /for the first page you don't need to show previos button
if(tracevall = 1) buf.append("<INPUT TYPE=SUBMIT NAME=SURF
VALUE=Previous>") ;
buf.append("<INPUT
TYPE=SUBMIT NAME=SURF VALUE=Submit>");
buf.append (" </FORM > </BODY > </HTML>");
output. println( buf.toString(»;
output.close() ;
}
else
{
51
String cookname="qanswer"+tracevaI1;
Cookie c=new Cookie(cookname,qanswer);
c.setMaxAge( -10);
res.addCookie( c);
Cookie c1=new Cookie("end",(""+(end+1)));
c1.setMaxAge( -10);
res.addCookie(c1) ;
temp=traceval+ 1;
res.setContentType("text/html")
;
output= res.getWriter();
StringBuffer buf=new StringBuffer();
buf.a ppend(" < HTML>< HEAD><TITLE>");
buf.append("Examination Page");
buf.append(" </TITLE > </HEAD> < BODY>");
buf.append("Login Name: "+name+"<BR>"+"Login
ID:
"+ id +" < BR>" + exa m+" < BR> ");
buf.append("<FORM
ACTION= http://netvista
103: 8080/Sohebl/servlet/GetQuestAns
int temp1=0;
for(int i=start;i<=end;i++)
{
String check1=" ",check2=" ",check3=" ",check4=" ";
if (qans[temp1]>0
&& qans[temp1]<S)
{
if(qans[temp1]=
= 1) check1 =check1 +"CHECKED";
if(qans[temp1]=
=2) check2=check2+ "CHECKED";
if(qans[temp1]=
if(qans[temp1]=
=3) check3=check3+"CHECKED";
=4) check4=check4+ "CHECKED";
}
rs.a bsolute( qid [i]);
stl = rs.getInt("No");
st2=rs.getString ("Quest");
st3=rs.getString("
Ans1");
st4=rs.getString("Ans2")
;
stS = rs.getString("Ans3");
st6= rs.getString(" Ans4");
if(st2 = = null )st2 = "Unassigned";
if(st3 = = null)st3 =" Unassigned";
if(st4= =null)st4="Unassigned";
if(stS= =null)stS="Unassigned";
if(st6= =null)st6= "Unassigned";
buf.append("Q"+(i+ 1)+". "+st2+" <BR>");
METHOD=GET>");
52
buf.append(" <INPUT TYPE=radio NAME="+"Q"+(i+
1)+"
VALUE=" +" 1" +checkl +" >" +st3+" < BR>");
buf.append(" <INPUT TYPE=radio NAME="+"Q"+(i+ 1)+"
VALUE=" +" 2" +check2 +" >" +st4+" < BR>");
buf.append(" <INPUT TYPE=radio NAME="+"Q"+(i+ 1)+"
VALUE=" +" 3" + check3 +" >" +st5+" < BR>");
buf.append("<INPUT TYPE=radio NAME="+"Q"+(i+l)+"
VALUE=" + "4" +check4+" >" +st6+" < BR> < BR>");
templ++;
}
buf.append("<INPUT
TYPE=HIDDEN NAME=TRACEVALVALUE="+temp+">");
if(traceval = 1) buf.append(" <INPUT TYPE=SUBMIT NAME=SURF
l
VALUE=Previous>") ;
buf.append("<INPUT
TYPE=SUBMIT NAME=SURF VALUE=Next>");
buf.a ppend(" </FORM > </BODY> </HTM L>");
output. println(buf.toString(»;
output.c1ose() ;
}
}catch (SQLException sqlex) {System.out. println(sqlex) ;sqlex. printStackTrace();}
}
//Block-l's
else portion starts, used to calculate score
else if (surf.equals("Submit"»
{
String st2=null,st7=null,check=null;
double mark=O,count=O;
int rowno=O,qid[]=new
int[O],qperpage=O,end =O,qans[]=new
int[O ],stl ,condition =0;
String name=null,id=null,exam=null,qid
DecimalFormat twodigit=new
output= res.getWriter();
1=null,qanswer="",cnl
DecimaIFormat("O.OO");
Cookie cookies[]=null;
cookies= req .getCookies();
if (cookiesl =null)
{
for (int i=O;i<cookies.length;i++)
{
Cookie cookie = null;
cookie=cookies[i] ;
if( (cookie.getName(»
.equals("name"»
if( (cookie.getName()
.equals("id"»
if( (cookie.getName()
.equals("exam"»
if( (cookie.getName().equals("qid"»
name=cookie.getValue();
id =cookie.getValue();
exam=cookie.getValue();
qid 1=cookie.getValue();
=null;
~'
.)
if( (cookie.getName() ).equals("rowno"))
rowno= Integer.parseInt( cookie.getVaiue());
if( (cookie.getName() ).equals("end")) end= Integer. parseInt( cookie.getValue());
if( (cookie.getName()) .equals("q perpage"))
qperpage= Integer. parseInt( cookie.getVal ue());
}
}
int page=(int)Math.ceil(rowno/qperpage)+ 1;
/ /join cookies for all pages as qanswer
for(int j=O;j< =page;j++)
{
cnl=null;
en 1="qanswer";
cnl=cnl+j;
Cookie cookiesl[]=null;
cookiesl =req.getCookies();
if (cookiesl!=null)
{
for (int k=O;k<cookies1.length;k++)
{
Cookie cookiel = null;
cookiel =cookiesl [k];
if( (cookiel.getName()).equals(cnl))
}
}
}
res.setContentType("text/html") ;
StringBuffer buf=new StringBuffer();
//rs=null;
//rsl=null;
qid=new int[rowno];
qans=new int[rowno];
int temp=O;
//get question serial ID
for(int i=O;i<rowno;i++)
{
String str= '''';
do
{
str+ =qid 1.charAt(temp);
temp++;
}while(qidl.charAt(temp)!
='a');
qanswer+ =cookiel.getValue();
54
qid [i] =Integer, parseInt(str);
temp++;
}
/ /get answer value from the last page and join them with qanswer
String str= "";
for(int i=end;i<rowno;i++)
{
str+ =req.getParameter("Q"+(i+
1»;
str+="a";
}
qanswer+ =str;
//get all answer values as integer in qans[i]
temp=O;
for(int i=O;i<rowno;i++)
{
String strl = "";
do
{
strl + =qa nswer.charAt(temp);
temp++;
}while(qanswer.charAt(temp)!
='a');
if (strl.equals("null"»
{
qans[i]=99;
}
else
{
qa ns[i] = Integer. parseInt(strl);
}
temp++;
}
try
{
rs,c1ose(); s.c1ose();
s
=
c.createSta tement( ResuItSet.TYPE_SCROLL_SENSITIVE,
ResultSet, CONCUR_UPDAT
ABLE);
rs=s,executeQuery("Select
rs,next();
}catch(Exception
{
sqlex)
output= res.getWriter();
E.* from "+exam+"
E");
55
res.setContentType("text/html")
;
output.println(" <H2>Check following errorsl_l
output. println (sqlex);
output.c1ose();
}
</H2>");
1* get the correct answer no. using question ID (qid[]) from particular examination
table and compare with
value in qans[]*1
try
{
for(int i=O;i<rowno;i++)
{
rs.absolute( qid [i]);
st2 =rs.getString("CORRECT");
if(st2 = = null)st2 ="110";
if(st2.equalslgnoreCase(""+qans[i]))
}
rsl=s.executeQuery("Select
rsl.next();
mark=mark+ 1;
S.* from Student S WHEREID="'+id+''''');
Ilif st7! =null examination has been given before, so user can't give this exam again
st7=rsl.getString(exam)
if (st7==null)
{
;
s.executeUpdate("UPDATE student SET "+exam+"="+mark+"
ID="'+id+"'");
condition= 1;
s.executeQuery("COMMIT") ;
}
}catch(Exception sqlex)
{
output= res.getWriter();
res.setContentType("text/html")
output.println("<H2>Check
output. println(sqlex);
output.close() ;
}
;
following errors2 </H2 >");
Ilcondition==O means examination has been given before
if (condition = = 1)
{
buf.append(" < HTML>< HEAD><TITLE>");
buf.append("Examination
Score Page");
buf.append(" </TITLE> </HEAD> < BODY>");
WHERE
56
buf.append("Login Name: "+name+"<BR>"+"Login
ID:
"+ id+" <BR>" +exam+" < BR> <BR> <H2 >");
double rowno1 =(double)rowno;
buf.append("Your Score is: "+mark+"
in "+rowno1+"<BR>");
buf.append("Percentage is: "+twodigiUormat(
buf.append(" </H2 > </BODY> </HTMl>");
output. println(buf.toString());
output.close() ;
(mark/rowno)* 100)+ "%");
}
else
{
buf.append (" < HTML>< HEAD><TITLE>");
buf.append("Examination
Score Page");
buf.append(" </TITLE> </HEAD > < BODY>");
buf.append("Login Name: "+name+"<BR>"+"Login
ID: "+id+"<BR>"+exam+"
"+"<BR><H2>");
buf.append("We can't accept your score, this exam has been given
before. "+" <BR>");
buf.append(" </H2 > </BODY> </HTML>");
output. println (buf.toString ());
output.close() ;
}
} //Block-1's else portion start, if user wants to exit
else
{
res.setContentType("text/html")
output= res.getWriter();
;
StringBuffer buf=new StringBuffer();
buf.append (" < HTML>< HEAD><TITLE> ");
buf.append("Examination
Exit Page");
buf.append(" </TITLE> </HEAD> < BODY>");
buf.append("Good Bye, Give the examination later."+"<BR>");
buf.append(" </H2 > </BODY> </HTM L>");
output. printl n(buf. toString ());
output.close() ;
} / /End of Block1
}
public void destroy()
{
try
{
c.close() ;
57
}catch(Exception e) {System.err.println("Problem
}
}
closing the database");}
