JSTL Function fn:join Example

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Last Updated on 31 August 2019   |   Print  Email


This post helps you understand how to use the <fn:join> tag in the JSTL function tags library with code example.

The fn:join function joins the elements of an array into a string with specified delimiter.

 

JSTL <fn:join> Syntax:

${fn:join([array to join], <separator>)}

 

JSTL <fn:join> Example:

The following JSP code example splits a string delimited by comma (,) and then uses the resulted array to combine the array elements separated by empty space.

<%@ 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/functions" prefix="fn"%>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>fn:join Demo</title>
  </head>
  <body>
	<h1>fn:join Demo</h1>

	<c:set var="numbers" value="One,Two,Three,Four,Five" />
	<c:set var="splitNumbers" value="${fn:split(numbers,',')}" />
	<c:set var="joinedNumbers" value="${fn:join(splitNumbers,' ')}" />
	<p>Numbers before join: ${numbers}</p>
	<p>Joined Numbers: ${joinedNumbers}</p>
  </body>
</html>

 

Output:

JSTL function fn-join

 

Other JSTL Function Tags:

contains  |  containsIgnoreCase  |  endsWith |  escapeXml  |  indexOf  |  length  |  replace  |  split  |  startsWith  |  substring  |  substringAfter  |  substringBefore  |  toLowercase  |  toUpperCase  |  trim


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