JSTL fn:trim() Function

The fn:trim() function removes the blank spaces from both the ends of a string. It mainly used for ignoring the blank spaces from both the ends of string.

The syntax used for including the fn:trim() function is:

Let's see the simple example to understand the functionality of fn:trim() function:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<html>
<head>
<title>Using JSTL Functions</title>
</head>
<body>

<c:set var="str1" value="Welcome to JSP        programming         "/>
<p>String-1 Length is : ${fn:length(str1)}</p>

<c:set var="str2" value="${fn:trim(str1)}" />
<p>String-2 Length is : ${fn:length(str2)}</p>
<p>Final value of string is : ${str2}</p>

</body>
</html>

Output:

String-1 Length is : 42
String-2 Length is : 33
Final value of string is : Welcome to JSP programming

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