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How to See Total Visitors in webpage Using HTMl front End and Servlet Used for forwarding the Control ?
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For creating this project we need to create Some files like :-
index.jsp :- for front page
logout.jsp:- for log out page
________________________________index.jsp________________________________________
<html>
<body bgcolor="#FFCCFF">
<h1 align="center">Welcome to the World of java </h1>
<table align="right">
<tr>
<td>
<h4>
Total Visited :<%=application.getAttribute("TV") %>
</h4></td>
</tr>
<tr>
<td>
<h4>
Total Active :<%=application.getAttribute("TA") %>
</h4></td>
</tr>
</table>
<br />
<br />
<h4 align="center">Home page</h4>
<br />
<br />
<a href="logout.jlc">LOGOUT</a>
</body>
</html>
____________________________________Logout.jsp____________________________________
<%@ page session="false"%>
<html>
<body bgcolor="#FFCCFF">
<h1>Welcome to the World of java </h1>
<table align="right">
<tr>
<td>
<h4>
Total Visited :<%=application.getAttribute("TV") %>
</h4></td>
</tr>
<tr>
<td>
<h1>
Total Active :<%=application.getAttribute("TA") %>
</h1></td>
</tr>
</table>
<br />
<br />
<h4>You have logged out successfully</h4>
<br />
<br />
<a href="index.jsp">Go To Index Page</a>
</body>
</html>
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Now for forwarding a Control we have create three servlet classes
LogoutServlet.java
MyContextListener.java
MySessionListener.java
______________________________LogoutServlet.java ________________________________
package com.servlet;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
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 LogoutServlet extends HttpServlet {
protected void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
HttpSession sess=req.getSession(false);
if(sess!=null)
sess.invalidate();
RequestDispatcher rd=req.getRequestDispatcher("logout.jsp");
rd.forward(req, res);
}
}
__________________________MyContextListener.java________________________________
package com.servlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
public class MyContextListener implements ServletContextListener {
public void contextInitialized(ServletContextEvent event) {
System.out.println("**ContextInitialized***");
ServletContext ctx=event.getServletContext();
ctx.setAttribute("TV", 0);
ctx.setAttribute("TA", 0);
}
public void contextDestroyed(ServletContextEvent arg0) {
System.out.println("***contextDestroyed**");
}
}
__________________________MySessionListener.java______________________________
package com.servlet;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
public class MySessionListener implements HttpSessionListener {
public void sessionCreated(HttpSessionEvent event) {
HttpSession sess=event.getSession();
ServletContext ctx=sess.getServletContext();
int tv=(Integer) ctx.getAttribute("TV");
tv++;
ctx.setAttribute("TV", tv);
int ta=(Integer) ctx.getAttribute("TA");
ta++;
ctx.setAttribute("TA", ta);
}
public void sessionDestroyed(HttpSessionEvent event) {
HttpSession sess=event.getSession();
ServletContext ctx=sess.getServletContext();
int ta=(Integer) ctx.getAttribute("TA");
ta--;
ctx.setAttribute("TA",ta);
}
}
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For mapping
web.xml
_______________________________web.xml___________________________________
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Lab29</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>logoutServ</servlet-name>
<servlet-class>com.servlet.LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>logoutServ</servlet-name>
<url-pattern>/logout.jlc</url-pattern>
</servlet-mapping>
<listener>
<listener-class>com.servlet.MyContextListener</listener-class>
</listener>
<listener>
<listener-class>com.servlet.MySessionListener</listener-class>
</listener>
</web-app>
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Please find attached image where we put all these files so it can be accessible and O/P Console as well .
if any Doubt and suggestion wanted Contact any time
Thanks & Regards
Anand Dwivedi
Software Developer
Email: ananddwivedi92@gmail.com
