Download Lab 3 - IPFW.edu

LAB 3
UML for small Java Servlet Development
OBJECTIVE AND BACKGROUND
The purpose of this second UML lab is to familiarize programmers with Java
Servlet development in Rational Rose. We will learn to use UML to create java
Servlet class. At the end of this lab, you should be able to run a simple Hello
servlet class using Tomcat 4.0.1 server on localhost.
WEB SITE REFERENCES
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Professor Lin’s Web site: http://www.etcs.ipfw.edu/~lin
Rational, the Software Development Company www.rational.com
Jakarta Tomcat 4.0.1 http://jakarta.apache.org/builds/jakarta-tomcat4.0/release/v4.0.1/bin/
http://java.sun.com/docs/books/tutorial/servlets/index.html
EQUIPMENT AND SOFTWARE
 PC (256 Mbytes, Windows 95/98/2000 OS)
Rational Rose Enterprise Software
 SUN Java Development Tool kit J2SE (standard edition) or J2EE
(enterprise edition)
 Notepad editor
PROCEDURE
a) Creating a simple servlet (HelloWWW.java)
Step 1: Run Rational Rose Enterprise
Step 2: Create a Use Case Diagram
1. Click on Use Case View > Main
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Lab 3 – UML and JavaServlet
2. From the menu bar select Tool > Create > Use Case
3. Select the Package from the Toolbox and place it into the Use Case
Diagram
4. Right click on the package to see the pop-up menu, and then select Open
Specification menu
5. Change the name of the package to Browser.
6. Create HTML pages, HTTP, Web server, and Server pages packages.
7. Use dependency arrow to associate packages.
8. Between Web server and Server pages, draw dependency arrow once
from Web server to Server pages. And draw another arrow again from
Server pages to Web server. Do the same for HTML pages and Server
pages.
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Browser
HTTP
Web server
Server pages
HTML pages
Step 3: Create HelloWWW Class Diagram (classes, attributes, and operations)
1. Click on Browse>Class Diagram. Make sure Logical View is selected in
the package windows. Select New to create a new logical view.
2. Give the Diagram title name as Main.
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3. Click on Use Logical View > Main
4. Create a new class called “HelloWWW”
- Tools > Java/J2EE > New Servlet
- Type in “HelloWWW” at Servlet Name text field and make sure “extends
HttpServlet“and GET from HTTP Request Handlers are checked.
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Lab 3 – UML and JavaServlet
3. The following class will appear in the logical view workspace.
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Step 4. Code Generation
1. From the menu bar, select Tools > Java/J2EE > Project Specification.
2. Double-click on the last one of the Classpaths as shown in the following
diagram.
3. Click on the button with three dots to see a dialog box.
4. Choose Directory.
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5. Right click on the class diagram and select Java/J2EE> Generate Code.
Choose your working directory and click “OK”.
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The following codes in HelloWWW.java are generated
//
// -- Java Code Generation Process -// Import Statements
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloWWW extends javax.servlet.http.HttpServlet
{
/**
* @roseuid 3C59EE93007C
* @J2EE_METHOD -- HelloWWW
*/
public HelloWWW ()
{
}
/**
* @roseuid 3C59EE93009A
* @J2EE_METHOD -- doGet
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Lab 3 – UML and JavaServlet
* Called by the server (via the service method) to allow a servlet to handle a
GET request.
* The servlet container must write the headers before committing the
response, because
* in HTTP the headers must be sent before the response body. The GET
method should
* be safe and idempotent. If the request is incorrectly formatted, doGet returns
an
* HTTP 'Bad Request' message.
*/
public void doGet (javax.servlet.http.HttpServletRequest request,
javax.servlet.http.HttpServletResponse response)
throws javax.servlet.ServletException, java.io.IOException
{
}
}
Step 5. Code Editing
//
// -- Java Code Generation Process -// Import Statements
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloWWW extends javax.servlet.http.HttpServlet
{
/**
* @roseuid 3C59F57A0074
* @J2EE_METHOD -- HelloWWW
*/
public HelloWWW ()
{
}
/**
* @roseuid 3C59F57A007D
* @J2EE_METHOD -- doGet
* Called by the server (via the service method) to allow a servlet to handle a
GET request.
* The servlet container must write the headers before committing the
response, because
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Lab 3 – UML and JavaServlet
* in HTTP the headers must be sent before the response body. The GET
method should
* be safe and idempotent. If the request is incorrectly formatted, doGet returns
an
* HTTP 'Bad Request' message.
*/
public void doGet (javax.servlet.http.HttpServletRequest request,
javax.servlet.http.HttpServletResponse response)
throws javax.servlet.ServletException, java.io.IOException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<head>");
out.println("<title>Hello WWW!</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Hello WWW!</h1>");
out.println("</body>");
out.println("</html>");
}
}
Step 6. Compiling and Running the servlet
1. To compile HelloWorld.java from command line, open a command shell.
2. Make sure the path is set to c:\jdk1.3.1_02\bin or the directory where
Java Development Kit (JDK) was installed.
3. Make sure you have jdk1.3.1_02 installed. And also javax.servlet API is
installed in the working directory of the source code.
4. Run javac program with the source file HelloWorld.java as the parameter
name. C:>lab3> javac HelloWorld.java
Or Using Jbuilder 5
5. Launch Jbuilder 5.0; Create a new project.
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6. Add java file HelloWWW.java to the project.
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7. Click on project>properties. Click on Required Libraries tab. Make
sure that Tomcat 3.2 Servlet and Servlet libraries are added. If not click
on Add and add those.
8. Compile the java file.
9. Look for the HelloWWW.class file in your working directory.
10. Download and install Tomcat 4.0.1 from
http://jakarta.apache.org/builds/jakarta-tomcat-4.0/release/v4.0.1/bin/
11. Place your HelloWWW.class file into WEB_INF folder to Tomcat Directory.
C:\Program Files\Apache Tomcat4.0\webapps\examples\WEBINF\classes\
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12. Run your servlet program from any web browser by typing in
http://localhost:8080/examples/servlet/HelloWWW
13. Also upload this Servlet to your Linux Web server and prepare a HTML page
to run this Servlet.
Questions (You may try to search through the Web for information):
1. What is the CGI (Common Gateway Interface) protocol?
2. What supporting programs are needed for running a Servlet.
3. Comparing Perl CGI programs, Java Servlet, JSP (Java Server page),
and Microsoft ASP (Application Server Page).
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