usercountlistener.java

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package com.bjsxt.drp.util.listener;

import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

public class UserCountListener implements HttpSessionListener,HttpSessionAttributeListener {
	
	private static int count = 0;
	
	public void sessionCreated(HttpSessionEvent httpSessionEvent) {
		System.out.println("UserCountListener.sessionCreated()");
	}

	public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
		System.out.println("UserCountListener.sessionDestroyed()");
	}

	public void attributeAdded(HttpSessionBindingEvent event) {
		// TODO Auto-generated method stub
		System.out.println("name=" + event.getName());
		System.out.println("name=" + event.getValue());
		if (event.getName().equals("user")) {
			count ++; 
		} 
		System.out.println("online count: " + count);
	}

	public void attributeRemoved(HttpSessionBindingEvent event) {
		// TODO Auto-generated method stub
		
	}

	public void attributeReplaced(HttpSessionBindingEvent event) {
		// TODO Auto-generated method stub
		
	}

}