Use of <fn:substringBefore(String, String)> and <fn:subStringAfter(String, String)>JSTL Tag
In this section we will learn how to use <fn:substringBefore> and <fn:substringAfter>
Tag of JSTL. These tags returns the sub string before/after specified sub string. This
takes string type as arguments and return string type result.
<fn:substringBefore> This tag returns a subset of a string before a
specific substring. <fn:substringAfter> This tag returns a subset of a string
following a specific substring.
| Syntax : |
java.lang.String substringBefore(java.lang.String,
java.lang.String) |
substringBefore_subStringAfter_JstlTag.jsp
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title>Example of 'fn:substringBefore' and 'fn:substringAfter' tag of jstl</title>
</head>
<body>
<form method="POST">
Enter first string from which you want to retrieve substring.<br>
Enter second string before/after that you want to retrieve subString.
<table>
<tr>
<td>Enter First String</td>
<td><input type="text" name="fString"></td>
</tr>
<tr>
<td>Enter Second String</td>
<td><input type="text" name="sString"></td>
</tr>
<tr>
<td></td>
<td><input type="radio" name="radio" value="before"> Before
<input type="radio" name="radio" value="after"> After </td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="cut"></td>
</tr>
</table>
</form>
<c:if test="${pageContext.request.method=='POST'}">
<c:set var="fString" value="${param.fString}"/>
<c:set var="sString" value="${param.sString}"/>
<font size="5" color="green">
<c:if test="${param.radio=='before'}">
<c:out value="${fn:substringBefore(fString,sString)}"/>
</c:if>
<c:if test="${param.radio=='after'}">
<c:out value="${fn:substringAfter(fString,sString)}"/>
</font>
</c:if>
</c:if>
</body>
</html>
This jsp code shows the following output :
Here user will enter string and a sub string and then select radio button as per user choice....
When user clicks on cut button, output will be.......
