Servlet Http Session Binding Listener project

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/**

 * 

 */

package com.cv.session;



import javax.servlet.http.HttpSessionBindingEvent;

import javax.servlet.http.HttpSessionBindingListener;



/**

 * @author Chote

 * 

 */

public class Dog implements HttpSessionBindingListener   {



  private String breed;



  public Dog() {



  }



  public Dog(String arg) {

    System.out.println("dog obj created===" + arg);

    breed = arg;



  }



  public String getBreed() {

    System.out.println("dog obj return==="+breed);

    return breed;

  }



  @Override

  public void valueBound(HttpSessionBindingEvent arg0) {

    System.out.println("valueBound is called==="+arg0);

    

  }



  @Override

  public void valueUnbound(HttpSessionBindingEvent arg0) {

    System.out.println("valueUnbound is called==="+arg0);

    

  }

}


 

    
package com.cv.session;



import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpSessionAttributeListener;

import javax.servlet.http.HttpSessionBindingEvent;



public class MySessionAttributeListener implements HttpSessionAttributeListener {

  private static final long serialVersionUID = 1L;



  /**

   * @see HttpServlet#HttpServlet()

   */

  public MySessionAttributeListener() {

    super();

    System.out.println("MyServletContextListener obj created===");

  }



  @Override

  public void attributeAdded(HttpSessionBindingEvent arg0) {



    System.out.println("attributeAdded obj added to the session...");

  }



  @Override

  public void attributeRemoved(HttpSessionBindingEvent arg0) {

    System.out.println("attributeRemoved obj added to the session...");



  }



  @Override

  public void attributeReplaced(HttpSessionBindingEvent arg0) {

    System.out.println("attributeReplaced obj added to the session...");

  }



}


 

    
package com.cv.session;



import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpSession;

import javax.servlet.http.HttpSessionEvent;

import javax.servlet.http.HttpSessionListener;







public class MySessionListener implements HttpSessionListener {

  private static final long serialVersionUID = 1L;



  /**

   * @see HttpServlet#HttpServlet()

   */

  public MySessionListener() {

    super();

    System.out.println("MyServletContextListener obj created===");

  }



  @Override

  public void sessionCreated(HttpSessionEvent arg0) {

    System.out.println("sessionCreated===" + arg0);

    HttpSession type = arg0.getSession();

    String value = type.getServletContext().getInitParameter("context");

    System.out.println("type is===" + value);

    Dog d = new Dog(value);

    System.out.println("dog object adding to session...");

    type.setAttribute("sessAttr", d);    

    System.out.println("dog object addded to session...");

    System.out.println("===========================");

    

    Dog dog = (Dog)type.getAttribute("dogAttr");

    

    System.out.println("dog object is==="+dog);



  }



  @Override

  public void sessionDestroyed(HttpSessionEvent arg0) {

  System.out.println("sessionDestroyed is called...");



  }



}


 

    
package com.cv.session;



import java.io.IOException;

import java.io.PrintWriter;

import java.util.Enumeration;



import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;



/**

 * Servlet implementation class TestServlet

 */

@WebServlet("/TestServlet")

public class TestServlet extends HttpServlet {

  private static final long serialVersionUID = 1L;



  /**

   * @see HttpServlet#HttpServlet()

   */

  public TestServlet() {

    super();

    // TODO Auto-generated constructor stub

  }



  /**

   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse

   *      response)

   */

  protected void doGet(HttpServletRequest request,

      HttpServletResponse response) throws ServletException, IOException {



    response.setContentType("text/html");

    PrintWriter out = response.getWriter();

    out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");

    out.println("<HTML>");

    out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");

    out.println("  <BODY>");

    out.print("    This is ");

    out.print(this.getClass() + "<br>");



    PrintWriter aPW = response.getWriter();



    // String scontext = getServletConfig().getInitParameter("init");



    HttpSession httpSession =  request.getSession();    

    Dog dog = (Dog) httpSession.getAttribute("sessAttr");

    System.out.println(dog.getBreed());

    aPW.print(dog.getBreed());

    out.flush();

    out.close();



  }



  /**

   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse

   *      response)

   */

  protected void doPost(HttpServletRequest request,

      HttpServletResponse response) throws ServletException, IOException {

    doGet(request, response);

  }



}


 

    
package com.cv.servlet.session.listener;



import javax.servlet.http.HttpSessionBindingEvent;

import javax.servlet.http.HttpSessionBindingListener;



import org.apache.log4j.Logger;



/**

 * @author Chandra Vardhan

 *

 */

public class Dog implements HttpSessionBindingListener {



  private static final Logger LOGGER = Logger.getLogger(Dog.class);



  private String name;



  public String getName() {

    return name;

  }



  public void setName(String name) {

    this.name = name;

  }



  public Dog() {

  }



  public Dog(String name) {

    this.name = name;

  }



  @Override

  public void valueBound(HttpSessionBindingEvent httpSessionBindingEvent) {

    LOGGER.info("Entered into valueBound(--) of Dog class... ");

    Dog dog = (Dog) httpSessionBindingEvent.getValue();

    if (dog != null) {

      LOGGER.info("Value of the Session attribute is : " + dog.getName());



    }

    LOGGER.info("Checking whether it is stored as session attribute : "

        + httpSessionBindingEvent.getSession().getAttribute("dog"));

    dog.setName("Tommy is the second pet name...");

    // httpSessionBindingEvent.getSession().setAttribute("dog", dog);



  }



  @Override

  public void valueUnbound(HttpSessionBindingEvent httpSessionBindingEvent) {

    LOGGER.info("Entered into valueUnbound(--) of Dog class... ");

    Dog dog = (Dog) httpSessionBindingEvent.getValue();

    if (dog != null) {

      LOGGER.info("Value of the Session attribute is : " + dog.getName());



    }

  }



}


 

    
package com.cv.servlet.session.listener;





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;



import org.apache.log4j.Logger;



/**

 * Servlet implementation class HttpSessionListenerServlet

 * 

 * @author Chandra Vardhan

 *

 */

public class HttpSessionListenerServlet extends HttpServlet {

  

  private static final Logger LOGGER = Logger.getLogger(HttpSessionListenerServlet.class);

  

  private static final long serialVersionUID = 1L;

       

    /**

     * @see HttpServlet#HttpServlet()

     */

    public HttpSessionListenerServlet() {

        super();

    }



  /**

   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

   */

  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    LOGGER.info("Entered into doGet(--) of HttpSessionListenerServlet class... ");    

    

    response.setContentType("text/html");

    PrintWriter out = response.getWriter();

    Dog dog = new Dog("Jokey");

    HttpSession session = request.getSession();

    session.setAttribute("dog", dog);

    LOGGER.info("session attribute added");        

    Dog dogAttribute =(Dog)session.getAttribute("dog");

    out.print("Value of the session attribute is : "+dogAttribute.getName());    

    session.invalidate();

  }



  /**

   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

   */

  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    LOGGER.info("Entered into doPost(--) of HttpSessionListenerServlet class... ");    

    

    doGet(request, response);

  }



}



<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Beer title here</title>

</head>

<body>


	<form action="HttpSessionListenerServlet" method="post">

		<input type="submit" value="Click here to continue...">

	</form>


</body>

</html>

















#By default enabling Console appender

# Root logger option

log4j.rootLogger=INFO, stdout



# Redirect log messages to console

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.Target=System.out

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%-5p [%c]:%L -->> %m%n



# Redirect log messages to a log file

#log4j.appender.file=org.apache.log4j.RollingFileAppender

#log4j.appender.file.File=C:\\servlet-application.log

#log4j.appender.file.MaxFileSize=5MB

#log4j.appender.file.MaxBackupIndex=10

#log4j.appender.file.layout=org.apache.log4j.PatternLayout

#log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
















<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <artifactId>httpSessionBindingListener</artifactId>
  <version>1.0</version>
  <packaging>war</packaging>
   <properties>
		<log4j.version>1.2.16</log4j.version>
		<java.version>1.8</java.version>
	</properties>

	<build>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.3</version>
				<configuration>
					<source>${java.version}</source>
					<target>${java.version}</target>
				</configuration>
			</plugin>
			<plugin>
				<artifactId>maven-war-plugin</artifactId>
				<version>2.6</version>
				<configuration>
					<warSourceDirectory>WebContent</warSourceDirectory>
					<failOnMissingWebXml>false</failOnMissingWebXml>
				</configuration>
			</plugin>
		</plugins>
	</build>
	<dependencies>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>servlet-api</artifactId>
			<version>3.0-alpha-1</version>
		</dependency>
		<dependency>
			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>1.3.1</version>
		</dependency>
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>${log4j.version}</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet.jsp</groupId>
			<artifactId>jsp-api</artifactId>
			<version>2.0</version>
		</dependency>
		<dependency>
			<groupId>jstl</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>
		<dependency>
			<groupId>taglibs</groupId>
			<artifactId>standard</artifactId>
			<version>1.1.2</version>
		</dependency>
	</dependencies>
	<groupId>com.cv.servlet.session.listener</groupId>
</project>
















 
<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee  http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"   version="3.1">

	<servlet>
		<servlet-name>HttpSessionListenerServlet</servlet-name>
		<servlet-class>com.cv.servlet.session.listener.HttpSessionListenerServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>HttpSessionListenerServlet</servlet-name>
		<url-pattern>/HttpSessionListenerServlet</url-pattern>
	</servlet-mapping>
	
	<welcome-file-list>
		<welcome-file>input.html</welcome-file>
	</welcome-file-list>
</web-app>













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