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JSTL core tag redirect Example

Posted in : Java Posted on : April 1, 2012 at 7:41 PM Comments : [ 0 ]

In this tutorial you will learn about the JSTL core redirect tag.

JSTL core tag redirect Example

In this tutorial you will learn about the JSTL core redirect tag.

<c:redirect> tag in jstl facilitates you for redirecting the browser to the specified url, url may either absolute or relative.

Attributes of <c:redirect> tag

url : This is an required attribute that is used for specifying either the relative or absolute url.
context : This attribute is used for specifying the web application which is followed by '/'. Default value of this attribute is a current application.

If the url attribute is specified by an absolute url then the browser will make an additional request to the new url and if the specified url is a relative url then the browser will show the original url in its address bar.

This tag also supports the <c:param> tag.

Example :

In the example given below will demonstrate you how to use the <c:redirect> tag in jsp. Here I have uses both types of url i.e absolute and relative urls. In an absolute type of url I have used the address outside the context which also contains the <c:param> tag using which the browser will make a new url and in the relative url I have used the url of the same context it will display the original url.

JstlCoreTagRedirectExample.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title>JSTL Example</title>
</head>
<body>
<h3>JSTL Core Tag redirect Example.</h3>
<!-- Absolute URL redirecting -->

<%-- <c:redirect url="http://www.google.com/search"> --%>
<%-- <c:param name="hl" value="en"/> --%>
<%-- <c:param name="q">devmanuals</c:param> --%>
<%-- </c:redirect> --%>

<!-- Relative URL redirecting -->
<c:redirect url="JstlCoreTagSetExample.jsp"/>
</body>
</html>

How to Run this example

Here I am using an IDE Eclipse so I am giving the process of executing this example in perspective of Eclipse. Before executing this example you will have needed to add the following jar files :

jstl.jar
standard.jar

After adding of these jar files you may execute your program in the following ways :

At first I have changed the preference of web browser from eclipse 'internal web browser' to 'firefox' because its internal browser will unable to open the requested page.
Select JstlCoreTagRedirectExample.jsp page of your project in Project Explorer -> RightClick -> Run As -> Run On Server -> Choose your server -> Finish.
On the Eclipse Editor go to your JstlCoreTagRedirectExample.jsp -> RightClick -> Run As -> Run On Server -> Choose your server -> Finish.
Go to Run button look at the toolbar in green color and click -> Choose your server -> Finish.
A simplest way to execute the example in Eclipse is to use the CTRL+F11 key -> Choose your server -> Finish

NOTE : In all of the above execution processes you may start the server first and stop the server each time after the execution if not, each time you will may prompted to a dialog box to Restart the server in Eclipse.

Output :

When the execution process will be completed successfully an output will be displayed on the firefox web browser as :

Following output is of the relative url redirecting.