JSTL Function fn:substring Example

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Last Updated on 30 August 2019   |   Print  Email



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

The fn:substring function returns a substring from a string provided begin and end index.

 

JSTL <fn:substring> Syntax:

${fn:substring(<string>, <beginIndex>, <endIndex>)}

 

JSTL <fn:substring> Example:

The following JSP code extracts a substring from a string based on begin and end index values.

<%@ 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:substring Demo</title>
  </head>
  <body>
    <h1>fn:substring Demo</h1>
    <c:set var="text" value="CodeJava.net is great source of information."/>
    <c:set var="website" value="${fn:substring(text, 0, 12)}" />
    Full Text: <strong><c:out value="${text}"/></strong><br/><br/>
    Substring Text (start index 0 - end index 12):  
    <strong><c:out value="${website}"/></strong><br/><br/>	
  </body>
</html>

 

Output:

JSTL function fn-substring

 

Other JSTL Function Tags:

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


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is certified Java programmer (SCJP and SCWCD). He began programming with Java back in the days of Java 1.4 and has been passionate about it ever since. You can connect with him on Facebook and watch his Java videos on YouTube.