Example program for HttpSessionListener

/*MySessionListener.java*/
package com.rajendra.servlets;

import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

public class MySessionListener implements HttpSessionListener
{
public MySessionListener() {
    }
  public void sessionCreated(HttpSessionEvent sessionEvent) {
  // Get the session
  HttpSession session = sessionEvent.getSession();
   try {
   System.out.println("Session created: "+session);
  session.setAttribute("foo","bar");
  } catch (Exception e) {
System.out.println("Error in setting session attribute: "+ e.getMessage());
 }
 }
 public void sessionDestroyed(HttpSessionEvent sessionEvent) {
 // Get the session that was invalidated
  HttpSession session = sessionEvent.getSession();
  // Log a message
  System.out.println("Session invalidated: "+session);
  System.out.println("The name is: " + session.getAttribute("foo"));
}
}
/*ServletSessionListener.java*/
package com.rajendra.servlets;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class ServletSessionListener extends HttpServlet{
public void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
HttpSession session= request.getSession();
String str = (String)session.getAttribute("foo");
pw.println("The name is " + str);
}
}

1. maintain the folder structure
2. write the web.xml file
3. \

What is HttpSessionListener