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How to use a value of XPath expression result in JSP in a variable?
The <x:set> tag sets a variable to the value of an XPath expression.
If the XPath expression results in a boolean, <x:set> tag sets a java.lang.Boolean object; for a string, java.lang.String; and for a number, java.lang.Number.
Attribute
The <x:set> tag has the following attributes −
| Attribute | Description | Required | Default |
|---|---|---|---|
| var | A variable that is set to the value of the XPath expression | Yes | Body |
| select | The XPath expression to be evaluated | No | None |
| scope | Scope of the variable specified in the var attribute | No | Page |
Example
Following example will show how to use the <x:set> tag −
<%@ taglib prefix = "c" uri = "http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix = "x" uri = "http://java.sun.com/jsp/jstl/xml" %>
<html>
<head>
<title>JSTL Tags</title>
</head>
<body>
<h3>Books Info:</h3>
<c:set var = "xmltext">
<books>
<book>
<name>Padam History</name>
<author>ZARA</author>
<price>100</price>
</book>
<book>
<name>Great Mistry</name>
<author>NUHA</author>
<price>2000</price>
</book>
</books>
</c:set>
<x:parse xml = "${xmltext}" var = "output"/>
<x:set var = "fragment" select = "$output//book"/>
<b>The price of the second book</b>:
<c:out value = "${fragment}" />
</body>
</html>Access the above JSP, the following result will be displayed −
Books Info: The price of the second book:[[book: null], [book: null]]
Updated on: 30-Jul-2019
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