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Use of Tag of JSTL

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

Use of <fn:indexOf(String, String)> Tag of JSTL


In this section we will learn how to use <fn:indexOf> Tag of JSTL. This tag returns index of first occurrence of specified sub string in the given string string. This takes string type as arguments and returns int type.


Syntax :
int indexOf(java.lang.String, java.lang.String)


<%@ taglib prefix="c" uri="" %>
<%@ taglib prefix="fn" uri="" %>
        <title>Example of fn:indexof tag of JSTL</title>
        <form method="POST">
            This will calculate the first occurance of given 
            character/string in the <br>specified String.
                    <td>Enter Text</td>
                    <td><input type="text" name="text"></td>
                    <td><input type="text" name="str"></td>
                    <td><input type="submit" value="search"></td>
        <c:if test="${pageContext.request.method=='POST'}">
            <c:set var="text" value="${param.text}"/>
            <c:set var="str" value="${param.str}"/>
            <font size="5" color="#1B2A0A">
                Index of first occurance : 
            <font size="5" color="green">

                <c:out value="${fn:indexOf(text,str)}"/>  


This jsp code shows the following output :


Suppose in 'mahendra singh' string user want to find index of the first occurrence of 'e'....

When user clicks on search button, output will be.....

Download Source Code



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February 15, 2012

get lastIndexOf????