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To Determine whether the Session is New or Old

                         

In this program we are going to make one servlet on session in which we will check whether the session is new or old. 

To make this program firstly we need to make one class named CheckingTheSession.  Inside the doGet() method, which takes two objects one of request and second of response. Inside this  method call the method getWriter() of the response object. Use getSession() of the request object, which returns the HttpSession object. Now by using the HttpSession we can find out whether the session is new or old. 

The code of the program is given below:

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class CheckingTheSession extends HttpServlet{
  protected void doGet(HttpServletRequest request, HttpServletResponse response)
                                   
throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter pw = response.getWriter();
    pw.println("Checking whether the session is new or old<br>");
    HttpSession session = request.getSession();
    if(session.isNew()){
      pw.println("You have created a new session");
    }
    else{
      pw.println("Session already exists");
    }
  }
}

web.xml file for this program:

<?xml version="1.0" encoding="ISO-8859-1"?>
<!--<!DOCTYPE web-app
 PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd"> -->

<web-app>
 <servlet>
  <servlet-name>Hello</servlet-name>
  <servlet-class>CheckingTheSession</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>Hello</servlet-name>
 <url-pattern>/CheckingTheSession</url-pattern>
 </servlet-mapping>
</web-app>

The output of the program is given below:

 Download this example:

                         

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