Use of <fn:subString(String, int, int)> Tag of JSTL
In this section we will learn how to use <fn:subString>
Tag of JSTL. This tag returns a subset of a string of specified length. This takes string
and integer type as arguments and return string type.
| Syntax : |
java.lang.String substring(java.lang.String,
int, int) |
subString_fnJstlTag.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:subString' tag of jstl</title>
</head>
<body>
<form method="POST">
Enter String here and mention upper and lower limit to
cut substring<br> from this given string.
<table>
<tr>
<td>Enter String</td>
<td><input type="text" name="string"></td>
</tr>
<tr>
<td>Start from</td>
<td><input type="text" name="start" size="3"></td>
</tr>
<tr>
<td>End to</td>
<td><input type="text" name="end" size="3"></td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="cut"></td>
</tr>
</table>
</form>
<c:if test="${pageContext.request.method=='POST'}">
<c:catch var="exception">
<c:set var="string" value="${param.string}"/>
<c:set var="start" value="${param.start}"/>
<c:set var="end" value="${param.end}"/>
<font size="5" color="green">
<c:out value="${fn:substring(string,start,end)}"/>
</font>
</c:catch>
<c:if test="${exception!=null}">
<font size="5" color="red">Error Found.</font>
</c:if>
</c:if>
</body>
</html>
|
This jsp code shows the following output :
Here user will enter string and specify the start and
end point form where user wants to retrieve the sub string....
When user clicks on cut button, output will be.......
