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Use of and Tag of JSTL
Posted on: August 24, 2008 at 12:00 AM

In this section, you will learn how to use and Tag of JSTL.

Use of <fn:split(String, String)> and <fn:join(String, String)> Tag of JSTL

In this section we will learn how to use <fn:split>and <fn:join> Tag of JSTL. These tags are used to split and join the specified string according to the given delimeter.

<fn:split> It splits a string into an array of sub strings on the basis of specified delimeter.
<fn:join> It joins all elements of an array into a string with the specified separator.

Syntax :

java.lang.String[] split(java.lang.String,
      java.lang.String)

      

      java.lang.String join(java.lang.String[], java.lang.String)

split_fnJstlTag.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

<html>
    <head>
        <title>Example fn:split and fn:join tag of JSTL</title>
    </head>
    <body>
        <c:set var="str1" value="This is first string"/>
        <c:set var="str2" value="This|is|second|string"/>
        <c:set var="str3" value="This|is+third*string"/>

        <h4>tag fn:split(Here we will split the given string in 
         to array of string on the <br>basis of given delimeter)</h4>
        <table width="50%" border="1">
            <tr>
                <th>Input String</th>
                <th>Delimiter(s)</th>
                <th>After split</th>
            </tr>
            <tr>
                <td>${str1}</td>
                <td>white space</td>
                <td>
                    <c:forEach var="num" items="${fn:split(str1, ' ')}">
                        <c:out value="${num}" /> 
                    </c:forEach>
                </td>
            </tr>

            <tr>
                <td>${str2}</td>
                <td>|</td>
                <td>
                    <c:forEach var="num" items="${fn:split(str2, '|')}">
                        <c:out value="${num}" /> 
                    </c:forEach>
                </td>
            </tr>

            <tr>
                <td>${str3}</td>
                <td>+|*</td>
                <td>
                    <c:forEach var="num" items="${fn:split(str3, '+|*')}">
                        <c:out value="${num}" /> 
                    </c:forEach>
                </td>
            </tr
        </table>

        <h4>tag fn:split(Here we will join the splitted array of string 
         in to a single string <br>with the given separator)</h4>
        <table cellpadding="5" border="1">
            <tr>
                <th>Separator</th>
                <th>After join</th>
            </tr>
            <tr><c:set var="a1" value="${fn:split(str1, ' ')}" />
                <td> white space</td>
                <td><c:out value="${fn:join(a1, ' ')}" /></td>
            </tr>
            <tr><c:set var="a1" value="${fn:split(str2, '|')}" />
                <td>|</td>
                <td><c:out value="${fn:join(a1, ' | ')}" /></td>
            </tr>
            <tr><c:set var="a1" value="${fn:split(str3, '|+*')}" />
                <td>***</td>
                <td><c:out value="${fn:join(a1, ' *** ')}" /></td>
            </tr>
        </table>       
    </body>
</html>

This jsp code shows the following output :

Download Source Code

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