How to identify wheathet 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.

CheckingTheSession class

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
");
  HttpSession session = request.getSession();
  if(session.isNew()){
  pw.println("You have created a new session");
  }
  else{
  pw.println("Session already exists");
  }
  }
}

web.xml

 
  Hello
  CheckingTheSession
 
 
 Hello
 /CheckingTheSession
 

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