In this tutorial you will learn about the JSTL xml set tag.
JSTL XML Tag set Example
In this tutorial you will learn about the JSTL xml set tag.
<x:set> tag of JSTL xml core tag is used to set the value of an XPath expression.
Attributes of JSTL <x:set> tag
- var : This is required attribute that holds the value of the specified action.
- select : This is an optional attribute which specifies the evaluation of the XPath expression.
- scope : This is an optional attribute specifies the scope of the 'var' attribute.
Example :
In the example given below will demonstrate you about the JSTL <x:set> tag. In this example at first I have created an xml file that has to be parsed. Then created a JSP page where used the <c:import> tag of JSTL core to retrieve the XML document and stores it to the variable 'stu' by using 'var' attribute of this tag, then used the <x:parse> tag to parse the document using the attribute 'doc' and stores the result into the variable named 'doc' using the attribute 'var' and set the value of XPath expression '$doc/students/student' into the variable named 'record' using 'var' attribute then to iterate over all the elements I have used the <x:forEach> tag and stored the value in the variable named 'n' using 'var' attribute of this tag and in further statements I have used the <x:out> tag where the 'select' attribute will evaluate the XPath expression and output the result.
studentDetail.xml
<?xml version="1.0" ?> <students> <student> <name>Amit</name> <roll>33</roll> <grade>A</grade> </student> <student> <name>Mukesh</name> <roll>47</roll> <grade>B</grade> </student> <student> <name>Manoj</name> <roll>24</roll> <grade>B</grade> </student> <student> <name>Rajnish</name> <roll>84</roll> <grade>C</grade> </student> </students>
JstlXmlSet.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/xml" prefix="x" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>JSTL x:set Example</title>
</head>
<body>
<c:import url="studentDetail.xml" var="stu" />
<x:parse doc="${stu}" var="doc"/>
<x:set var="record" select="$doc/students/student"/>
<p>Details of Student</p>
<table>
<x:forEach var="n" select="$record">
<tr><td align="center">Name : </td> <td><x:out select="$n/name" /></td></tr>
<tr><td align="center">Roll :</td> <td><x:out select="$n/roll" /></td></tr>
<tr><td align="center">Grade :</td> <td><x:out select="$n/grade" /></td></tr>
</x:forEach>
</table>
</body>
</html>
How to run this example
Here I am using an IDE Eclipse so I am giving the process of executing this example in perspective of Eclipse. Before executing this example you will have needed to add the following jar files :
- jstl.jar
- standard.jar
- xalan-2.3.1.jar
- xercesImpl-2.7.1.jar
After adding of these jar files you may execute your program in the following ways :
- Select JstlXmlSet.jsp file of your project in Project Explorer -> RightClick -> Run As -> Run On Server -> Choose your server -> Finish.
- On the Eclipse Editor go to your JstlXmlSet.jsp -> RightClick -> Run As -> Run On Server -> Choose your server -> Finish.
- Go to Run button look at the toolbar in green color and click -> Choose your server -> Finish.
- A simplest way to execute the example in Eclipse is to use the CTRL+F11 key -> Run On Server -> Choose your server -> Finish
NOTE : In all of the above execution processes you may start the server first and stop the server each time after the execution if not, each time you will may prompted to a dialog box to Restart the server in Eclipse.
Output :
When you will execute the above JSP page you will get the output on your eclipse browser as follows :
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