Download ppt - CS

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

page
1
page
2
page
3
page
4
page
5
page
6
page
7
page
8
page
9
page
10
page
11
page
12
page
13
page
14
page
15
page
16
page
17
page
18
page
19
page
20
page
21
page
22
page
23
page
24
page
25
page
26
page
27
page
28
page
29
page
30
page
31
page
32
page
33
page
34
page
35
page
36
page
37
page
38
page
39
page
40
page
41
Document related concepts
no text concepts found
Transcript 
Examples of Using Servlets and
JSP
Representation and Management of
Data on the Internet
Working with Xaln
Combining Servlets and XSL
Working With XSL
• Add to the CLASSPATH:
– setenv CLASSPATH
${CLASSPATH}:/usr/local/java/apa
che/xerces/xerces.jar
– setenv CLASSPATH
${CLASSPATH}:/usr/local/java/apa
che/xalan/xalan.jar
You can download from the Web newer versions of
Xalan and Xerces
doc.xml
<?xml version="1.0"?>
<ROWSET>
<ROW>
<Subject>Java</Subject>
<Title>Hello Java</Title>
<Price>19$</Price>
</ROW>
<ROW>
<Subject>XML</Subject>
<Title>
XML for Beginners
</Title>
<Price>12$</Price>
</ROW>
<ROW>
<Subject>XSL</Subject>
<Title>
XSL in a Nut Shell
</Title>
<Price>34$</Price>
</ROW>
<ROW>
<Subject>JSP</Subject>
<Title>
Introduction to JSP
</Title>
<Price>17$</Price>
</ROW>
<ROW>
<Subject>JavaScript</Subject>
<Title>
A Path to JavaScript
</Title>
<Price>33$</Price>
</ROW>
</ROWSET>
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" />
<xsl:template match="/">
<HTML><HEAD><TITLE>A dbi Example</TITLE></HEAD>
<BODY bgcolor="F0F0F0" text="550000">
<CENTER><H1>Books List</H1></CENTER>
<TABLE BORDER="2" ALIGN="center">
<TR><TH></TH>
<xsl:for-each select="ROWSET/ROW[1]/*">
<TH><xsl:value-of select="name()" /></TH>
</xsl:for-each>
</TR>
<xsl:apply-templates select="ROWSET" />
</TABLE></BODY></HTML>
</xsl:template>
doc.xsl
<xsl:template match="ROW">
<TR><TD><xsl:number /></TD>
<xsl:for-each select="*">
<TD><xsl:value-of select="." />&#160;</TD>
</xsl:for-each>
</TR>
</xsl:template>
</xsl:stylesheet>
TransformServlet
import
import
import
import
java.io.*;
javax.servlet.*;
javax.servlet.http.*;
org.apache.xalan.xslt.*;
public class TransformServlet extends HttpServlet {
// Respond to HTTP GET requests from browsers.
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
// Set content type for HTML.
response.setContentType("text/html; charset=UTF-8");
// Output goes to the response PrintWriter.
PrintWriter out = response.getWriter();
try
{
XSLTProcessor processor =
XSLTProcessorFactory.getProcessor();
// Get the XML input document and the stylesheet,
// both in the servlet engine document directory.
XSLTInputSource xmlSource =
new XSLTInputSource(new java.net.URL
("http://www.cs.huji.ac.il/
~yarok/doc.xml").openStream());
XSLTInputSource xslSource =
new XSLTInputSource(new java.net.URL
("http://www.cs.huji.ac.il/
~yarok/doc.xsl").openStream());
// Generate the result.
XSLTResultTarget target =
new XSLTResultTarget(out);
// Creating the output
processor.process(xmlSource, xslSource, target);
}
// If an Exception occurs,
//return the error to the client.
catch (Exception e)
{
out.write(e.getMessage());
e.printStackTrace(out);
}
// Close the PrintWriter.
out.close();
}
}
Creating Results to a File
• A More Simple Example (not a servlet)
– Gets input from files where file names given as
parameters
– Write output to a file whose name given as a
parameter
import
import
import
import
org.apache.xalan.xslt.XSLTProcessorFactory;
org.apache.xalan.xslt.XSLTInputSource;
org.apache.xalan.xslt.XSLTResultTarget;
org.apache.xalan.xslt.XSLTProcessor;
/**
* Simple sample code to show how
* to run the XSL processor
* from the API.
*/
public class TransformExample
{
public static void main(String[] args)
throws java.io.IOException,
java.net.MalformedURLException,
org.xml.sax.SAXException
{
{
// Have the XSLTProcessorFactory
// obtain a interface to a
// new XSLTProcessor object.
XSLTProcessor processor =
XSLTProcessorFactory.getProcessor();
processor.process(new XSLTInputSource(args[0]),
new XSLTInputSource(args[1]),
new XSLTResultTarget(args[2]));
}
}
Using Beans in JSP
http://mangal:9999/dbi/jsp/dbconnect.jsp?login=yarok
http://mangal:9999/dbi/jsp/dbinsert.jsp?login=yarok
http://mangal:9999/dbi/jsp/dbinsertmore.jsp?login=yarok
The Bean Object
• The bean object is under the directory
<tomcat_home>/lib/dbi
• The bean belongs to the package “dbi”
package dbi;
import java.sql.*;
import java.io.*;
/**
* Example of using Java Beans in JSP pages
*/
public class DBBean
{
String login = null;
String url = "jdbc:oracle:thin:"+ login + "/" +
login + "@sol4:1521:stud";
String driver = "oracle.jdbc.driver.OracleDriver";
private Connection connection;
public DBBean()
{
super();
}
public String getLogin()
{
return login;
}
public void setLogin(String login)
{
this.login = login;
}
public boolean connect()
throws ClassNotFoundException,SQLException
{
Class.forName(driver);
connection = DriverManager.getConnection(url);
return true;
}
public void close() throws SQLException
{
connection.close();
}
public ResultSet poseQuery(String sql)
throws SQLException
{
Statement s = connection.createStatement();
ResultSet rs = s.executeQuery(sql);
return rs;
}
public int applyUpdate(String sql)
throws SQLException
{
Statement s = connection.createStatement();
int r = s.executeUpdate(sql);
return r;
}
}
The JSP Pages
•
•
•
•
There are three JSP pages
The first page opens the connection
The third page closes the connection
All three pages using the same bean
First Page
<HTML>
<HEAD><TITLE>
Example of using beans in a JSP – Connect
</TITLE></HEAD>
<BODY>
<%@ page language="Java" import="java.sql.*" %>
<jsp:useBean id="db" scope="session"
class="dbi.DBBean" />
<jsp:setProperty name="db" property="login"
param="login" />
<%!
ResultSet rs = null ;
ResultSetMetaData rsmd = null ;
int numColumns ;
int i;
%>
<center>
<h2> Created the Table </h2>
(in the database of the user
<jsp:getProperty name="db" property="login"/>)
<hr>
<br><br>
<font color="blue" size="4">
<table border=1>
<%
db.connect();
try {
db.applyUpdate("DROP TABLE test");
} catch (Exception e) {}
try {
i = db.applyUpdate("CREATE TABLE test
(name varchar2(10), id number(6))");
rs = db.poseQuery("SELECT * FROM test");
} catch(SQLException e) {
throw new ServletException
("Error in the query", e);
}
rsmd = rs.getMetaData();
numColumns = rsmd.getColumnCount();
%>
<TR>
<%
for (int column=1; column <= numColumns; column++) {
%>
<TD><%= rsmd.getColumnName(column) %> </TD>
<%
}
%>
</TR>
<%
while(rs.next()) {
%>
<TR><TD><%= rs.getString("name") %></TD>
<TD><%= rs.getString("id") %></TD></TR>
<%
}
%>
</table>
</font>
<P>
<font color="red" size="6">
Created the Tables</font>
<P>
<a href="dbinsert.jsp?login=
<jsp:getProperty name="db" property="login"/>">Next</a>
</body>
</HTML>
Second Page
<HTML>
<HEAD><TITLE>
Example of using beans in a JSP – Insert
</TITLE></HEAD>
<BODY>
<%@ page language="Java" import="java.sql.*" %>
<jsp:useBean id="db" scope="session"
class="dbi.DBBean" />
<jsp:setProperty name="db" property="login"
param="login" />
<%!
ResultSet rs = null ;
ResultSetMetaData rsmd = null ;
int numColumns ;
int i;
%>
<center>
<h2> Inserting Two Rows </h2>
(in the database of the user
<jsp:getProperty name="db" property="login"/>)
<hr>
<br><br>
<font color="blue" size="4">
<table border=1>
<%
try{
i = db.applyUpdate(
"INSERT INTO test VALUES ('aaa', 123)");
i = db.applyUpdate(
"INSERT INTO test VALUES ('bbb', 456)");
rs = db.poseQuery("SELECT * FROM test");
} catch(SQLException e) {
throw new ServletException
("Error in the query", e);
}
rsmd = rs.getMetaData();
numColumns = rsmd.getColumnCount();
%>
<TR>
<%
for (int column=1; column <= numColumns; column++) {
%>
<TD><%= rsmd.getColumnName(column) %> </TD>
<%
}
%>
</TR>
<%
while(rs.next()) {
%>
<TR><TD><%= rs.getString("name") %></TD>
<TD><%= rs.getString("id") %></TD></TR>
<%
}
%>
</table>
</font>
<P>
<font color="red" size="6">
After Insertion</font>
<P>
<a href="dbinsertmore.jsp?login=
<jsp:getProperty name="db" property="login"/>">Next</a>
</body>
</HTML>
Third Page
<HTML>
<HEAD><TITLE>
Example of using beans in a JSP – Insert
</TITLE></HEAD>
<BODY>
<%@ page language="Java" import="java.sql.*" %>
<jsp:useBean id="db" scope="session"
class="dbi.DBBean" />
<jsp:setProperty name="db" property="login"
param="login" />
<%!
ResultSet rs = null ;
ResultSetMetaData rsmd = null ;
int numColumns ;
int i;
%>
<center>
<h2> Inserting Two More Rows </h2>
(in the database of the user
<jsp:getProperty name="db" property="login"/>)
<hr>
<br><br>
<font color="blue" size="4">
<table border=1>
<%
try{
i = db.applyUpdate(
"INSERT INTO test VALUES (‘ccc', 789)");
i = db.applyUpdate(
"INSERT INTO test VALUES (‘ddd', 911)");
rs = db.poseQuery("SELECT * FROM test");
} catch(SQLException e) {
throw new ServletException
("Error in the query", e);
}
rsmd = rs.getMetaData();
numColumns = rsmd.getColumnCount();
%>
<TR>
<%
for (int column=1; column <= numColumns; column++) {
%>
<TD><%= rsmd.getColumnName(column) %> </TD>
<%
}
%>
</TR>
<%
while(rs.next()) {
%>
<TR><TD><%= rs.getString("name") %></TD>
<TD><%= rs.getString("id") %></TD></TR>
<%
}
%>
</table>
</font>
<%
db.close();
%>
<BR>
<font color="red" size="6">Done</font>
<P>
</body>
</HTML>
Related documents