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Wednesday, 23 October 2013

Write a Java Program to Demonstrate the use of JavaServer Pages Standard Tag Library(JSTL)

Aim: Demonstrate use of JSTL.
Index.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSTL DEMO</title>
    </head>
    <body>
        <h1>Hello World!</h1>
        <a href="XMLDemo.jsp">XMLDemo</a>
        <a href="SQLDemo.jsp">SQLDemo</a>
        <a href="COREDemo.jsp">COREDemo</a>
        <a href="FUNCTIONDemo.jsp">FUNCTIONDemo</a>
        <a href="CUSTOMDemo.jsp">CUSTOMDemo</a>
    </body>
</html>

COREDEMO.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>Core Demo</h1><hr>
        <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
        <h4>c-out Demo..<br/>
        <c:out value="6"></c:out></h4>
        <c:set var="x" value="10"></c:set><br/>
        <c:if test="${x eq 10}">
            <h4>If Condition Checked..<br/>
                Value of x is..<br/>
            <c:out value="${x}"></c:out>
            </h4>
        </c:if>
    </body>
</html>
SQLDEMO.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib  prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>SQL Demo</h1>
        <hr>
        <c:catch>
            <sql:setDataSource
                var="datasourceobj"
                driver="com.mysql.jdbc.Driver"
                url="jdbc:mysql://localhost/book"
                user="root"  password="root"/>
<sql:query var="resultsetobj"
                       dataSource="${datasourceobj}">
                Select * from book
            </sql:query>
<table border="1">
                <c:forEach var="row" items="${resultsetobj.rows}" >
                    <br>
                    <tr>
                        <th>Book</th>
    <td> <c:out value="${row.bookname}" /></td>
   <td><c:out value="${row.title}" /></td>
                        <td><c:out value="${row.author}" /></td>
                    </tr>    
            </c:forEach>
        </table>
    </c:catch>
    Exception is : ${e}
</body>
</html>

FUNCTIONDEMO.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>Function Demo</h1>
    <c:set var="string1" value="This is Example of Function."/>
    <p>Original String:${string1}</p><br/>
    <hr>
<c:set var="string2" value="${fn:toUpperCase(string1)}" />
<c:set var="string3" value="${fn:toLowerCase(string1)}" />
<p>toUpper : ${string2}</p>
<p>toLower : ${string3}</p>
<p>Index of 'Example' : ${fn:indexOf(string1, "Example")}</p>
</body>
</html>
XMLDEMO.jsp
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/xml" prefix="x" %>
<html>
  <head>
    <title>For Each Examples</title>
  </head>
<body>
      <c:set var="students">
        <students>
   <student id="1">
      <name>
         <first>A</first>
         <last>B</last>
         <middle>T</middle>
      </name>
      <grade>
         <points>88</points>
         <letter>B</letter>
      </grade>
   </student>
   <student id="2">
      <name>
         <first>C</first>
         <last>D</last>
         <middle>K</middle>
      </name>
      <grade>
         <points>92</points>
         <letter>A</letter>
      </grade>
   </student>
   <student id="3">
      <name>
         <first>E</first>
         <last>F</last>
         <middle>A</middle>
      </name>
      <grade>
         <points>72</points>
         <letter>C</letter>
      </grade>
   </student>
</students>
      </c:set>
    <%--<c:import var="students" url="http://localhost:8080/students.xml" />
--%>
<x:parse var="doc" xml="${students}" />
      <table>
      <x:forEach var="student" select="$doc/students/student">
        <tr>
          <td>
            <x:out select="$student/name/first" />
          </td>
<td>
            <x:out select="$student/name/last" />
          </td>
 <td>
            <x:out select="$student/grade/points" />
          </td>
<td>
            <x:out select="$student/grade/letter" />
          </td>
        </tr>
      </x:forEach>
    </table>
  </body>
</html>

CUSTOMDEMO.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="mine" uri="/WEB-INF/tlds/custom" %>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>CUSTOM Demo</h1>
        <hr>
        <mine:custom user="${name}">
         </mine:custom>
    </body>
</html>

Custom tag descriptor:
<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.1" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd">
  <tlib-version>1.0</tlib-version>
  <uri>/WEB-INF/tlds/custom</uri>
  <tag>
  <name>custom</name>
  <tag-class>customClass</tag-class>
  <attribute>
  <name>user</name>
  </attribute>
  </tag>
</taglib>

Custom class
import javax.servlet.jsp.tagext.*;
public class customClass extends SimpleTagSupport{
   public String user;
@Override
public doTag() throws SimpleTagJSPexception,IOexception{
 return getJSPContext().getOut().Write("hello"+user);
}
void setuser(string user){
    this.user=user;
}
}

at

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