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JSTL Function fn:contains()

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The fn: contains() is a string function of JSP Standard Tag Library (JSTL). It is used to specify whether the string contains specified substring or not. If it contains substring, it returns true or else false.

Syntax of Function fn: contains()

         boolean: fn: contains(string, substring)

Example

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Function fn:contains()</title>
</head>
<body>

	Welcome to Javabeat contains "Java" word :
	<c:out value="${fn:contains(myjavabeat,java)}"/>

</body>
</html>

Details of the Code

  • <c:out value=”${fn:contains(myjavabeat,java)}”/> tag is used evaluate result of the expression using “out” tag of core library and to search specified string into existing string we have used fn:contains() function of function library which returns true if substring found otherwise returns false.

Steps for Execution

  • Save this file as contains_example.jsp in your eclipse IDE.
  • Now select this jsp file, right mouse click and select Run as ->Run on server

Output

When the execution process is completed successfully we will get the following output:
fn_contains

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About Krishna Srinivasan

He is Founder and Chief Editor of JavaBeat. He has more than 8+ years of experience on developing Web applications. He writes about Spring, DOJO, JSF, Hibernate and many other emerging technologies in this blog.