JSTL Join function is used to concatenate the strings contained in an array with the specified string.
“fn:join” is a string function of JSP Standard Tag Library(JSTL). This function is used to return string with all the elements of an array separated by a “separator”.
The fn:join() function concatenates all the elements of an array into a string with a specified separator.
Syntax:
The fn:join() function has following syntax:
String join (java.lang.String[], java.lang.String)
JST Join Function Example-
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>JSTL Join Function Example</title>
</head>
<body>
<c:set var="array1" value="${fn:split('I am a good programmer in java', ' ')}">
<c:out value="${fn:join(array1, '-')}"></c:out>
</body>
</html>
Output: I-am-a-good-programmer-in-java
As you can see above, fn:join() takes an array of String as input parameters and returns the result of concatenation of strings with another string specified as 2nd parameter in JSTL join function.
