Servlet Http Session Listener project

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package com.cv.servlet.session.listener;

/**

 * @author Chandra Vardhan

 *

 */

public class Dog {

  

  private String name;



  public String getName() {

    return name;

  }



  public void setName(String name) {

    this.name = name;

  }





  public Dog(String name) {

    this.name = name;

  }

}


 

    
package com.cv.servlet.session.listener;



import javax.servlet.http.HttpSessionEvent;

import javax.servlet.http.HttpSessionListener;



import org.apache.log4j.Logger;

/**

 * @author Chandra Vardhan

 *

 */

public class HttpSessionListenerImpl implements HttpSessionListener  {

  

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

  



  static private int activeSessions;

  

  public static int getActiveSessions() {

    return activeSessions;

  }



  public HttpSessionListenerImpl() {    

  }



  @Override

  public void sessionCreated(HttpSessionEvent se) {

    LOGGER.info("Entered into sessionCreated(--) of HttpSessionListenerImpl class... ");    

    

    ++activeSessions;

    LOGGER.info("No.of active sessions are available is : "+activeSessions);

  }



  @Override

  public void sessionDestroyed(HttpSessionEvent se) {

    LOGGER.info("Entered into sessionDestroyed(--) of HttpSessionListenerImpl class... ");    

    

    --activeSessions;

    LOGGER.info("No.of active sessions are available is : "+activeSessions);

  }



}


 

    
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();

    // setting “dog” attribute in request object    

    Dog dog = new Dog( getServletContext().getInitParameter("contextParam"));      

    HttpSession session = request.getSession();

    session.setAttribute("dog", dog);    

    out.print("<br/>");

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

    out.print("My Dog's first name is : "+ dogAttribute.getName());

    out.print("<br/>");

    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>HttpSessionListener</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">

	
	<context-param>
		<param-name>contextParam</param-name>
		<param-value>JokeyIsTheFirstPetName</param-value>
	</context-param>
	<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>
	
	<listener>
		<listener-class>com.cv.servlet.session.listener.HttpSessionListenerImpl</listener-class>
	</listener>
	<welcome-file-list>
		<welcome-file>input.html</welcome-file>
	</welcome-file-list>
</web-app>













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