Number of online people using Httpsessionlistener statistics

Source: Internet
Author: User

JSP Display online number code

Write the following Sessioncounter.java and compile it for sessiioncounter.class and then put it on your site classpath sessioncount (build this directory yourself) below

package SessionCount;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessionCounter implements HttpSessionListener {
private static int activeSessions = 0;
public void sessionCreated(HttpSessionEvent se) {
activeSessions++;
}
public void sessionDestroyed(HttpSessionEvent se) {
if(activeSessions > 0)
activeSessions--;
}
public static int getActiveSessions() {
return activeSessions;
}
}

Then create a online.jsp file to display the number of people online

<%@ page import="SessionCount.SessionCounter" %>

Online:

<%= SessionCounter.getActiveSessions() %>

Then you need to create a web.xml file in the Web-inf of your website as follows:

<!-- Web.xml -->
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/j2ee/dtds/web-app_2.3.dtd">
<web-app>
<!-- Listeners -->
<listener>
<listener-class>
SessionCount.SessionCounter
</listener-class>
</listener>
</web-app>

Then restart your application server and access the online.jsp check to see if the display is correct.



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