Friday, 13 June 2014

Servlets : HttpSessionListener Demo


















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HttpSessionListenerDemo Project Dir Structure

HttpSessionTestServlet.java
import java.io.IOException;

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 HttpSessionTestServlet extends HttpServlet
{
    private static final long serialVersionUID = 1L;

    public void init() throws ServletException
    {
        System.out.println("-----------------------------------------");
        System.out.println(" Init method is called in "
                + this.getClass().getName());
        System.out.println("--------------------------------------");
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException
    {
        response.setContentType("text/html");

        sleep();
        
        HttpSession httpSession = request.getSession();

        sleep();

        httpSession.invalidate();

    }

    private void sleep()
    {
        try
        {
            Thread.sleep(12000);
        }
        catch (InterruptedException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public void destroy()
    {
        System.out.println("-----------------------------------------");
        System.out.println(" destroy method is called in "
                + this.getClass().getName());
        System.out.println("-----------------------------------------");
    }

}

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

public class MyHttpSessionListener implements HttpSessionListener
{

    @Override
    public void sessionCreated(HttpSessionEvent httpSessionEvent)
    {
        System.out.println("\n###################################\n");

        System.out.println("sessionCreated method has been called in "
                + this.getClass().getName());

        HttpSession session = httpSessionEvent.getSession();

        System.out.print(session + " Created:");

        System.out.println("ID=" + session.getId() + " MaxInactiveInterval="
                + session.getMaxInactiveInterval());

        System.out.println("\n#####################################\n");

        /*
         * if Session is created, based on that if you want to perform any
         * operation then you can do it here.
         */

    }

    @Override
    public void sessionDestroyed(HttpSessionEvent httpSessionEvent)
    {
        System.out.println("\n###################################\n");

        System.out.println("sessionDestroyed method has been called in "
                + this.getClass().getName());

        HttpSession session = httpSessionEvent.getSession();

        System.out.print(session + " destroyed:");

        System.out.println("ID=" + session.getId() + " MaxInactiveInterval="
                + session.getMaxInactiveInterval());

        System.out.println("\n#####################################\n");

        /*
         * if Session is destroyed, based on that if you want to perform any
         * operation then you can do it here.
         */

    }

}

web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    metadata-complete="true" version="3.0">
    <display-name>HttpSessionListenerDemo</display-name>
    <description>
        This is a simple web application with a source code organization
        based on the recommendations of the Application Developer's Guide.
    </description>
    
    <servlet>
        <servlet-name>HttpSessionTestServlet</servlet-name>
        <servlet-class>HttpSessionTestServlet</servlet-class>
    </servlet>
    
    <servlet-mapping>
        <servlet-name>HttpSessionTestServlet</servlet-name>
        <url-pattern>/listenerTest</url-pattern>
    </servlet-mapping>
    
    <listener>
        <listener-class>MyHttpSessionListener</listener-class>
    </listener>
</web-app>

index.html
<html>
<body>
    <a href="listenerTest">listenerTest</a>
</body>
</html>

Environment Used 

JDK version :1.7.0_51
Tomcat version : 7.0.50 

To Download HttpSessionListenerDemoApp Project Click the below link

https://sites.google.com/site/javaee4321/servlets/HttpSessionListenerDemoApp.zip?attredirects=0&d=1

See also:

  • Servlets Tutorial
  • All Design Patterns Links
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