Dinesh on Java

JSP

JSP Redirect Example

JSP Redirect: In JSP Redirect URL is changed and it is slower than JSP Forward.
Page redirection is generally used when a document moves to a new location and we need to send the client to this new location or may be because of load balancing, or for simple randomization.The simplest way of redirecting a request to another page is using method sendRedirect() of response object. Following is the signature of this method:

public void response.sendRedirect(String location)
throws IOException

This method sends back the response to the browser along with the status code and new page location. You can also use setStatus() and setHeader() methods together to achieve the same redirection:

....
String site = "https://www.dineshonjava.com" ;
response.setStatus(response.SC_MOVED_TEMPORARILY);
response.setHeader("Location", site); 
....

JSP Redirect Example:

<%@ 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">
<html>
<head>
<title>JSP Redirect Example</title>
</head>
<body>
 <%
  String site = "https://www.dineshonjava.com" ;
  response.setStatus(response.SC_MOVED_TEMPORARILY);
  response.setHeader("Location", site);
  response.sendRedirect(site);
  
 %>
</body>
</html>

When the above JSP run on the server, it redirects to www.dineshonjava.com. If you notice the URL bar, it is changed to www.dineshonjava.com

It is a 2 step process:
Step 1: JSP Container receives the request for current JSP. It compiles and run the JSP. During execution, it finds the redirect for new resource.

Step 2: It redirects to the new resource.

During these 2 steps, URL is changed as it is considered as a completely new request.

JSP Redirect is slower than JSP forward where JSP container internally forwards the request to new resource and URL remains intact, hence user does not know about request forwarding.

Now let us put above code in index.jsp and call this JSP using URL http://localhost:8080/index/index.jsp. This would take you given URL https://www.dineshonjava.com.

<<Previous << || Index || >>Next >>

Dinesh Rajput

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development. His core expertise lies in the latest version of Spring Framework, Spring Boot, Spring Security, creating REST APIs, Microservice Architecture, Reactive Pattern, Spring AOP, Design Patterns, Struts, Hibernate, Web Services, Spring Batch, Cassandra, MongoDB, and Web Application Design and Architecture. He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!