www.pudn.com > shopping.rar > LoggedUserCounter.java

package com.bjsxt.shopping.util.listener; 
 
import javax.servlet.http.HttpSessionAttributeListener; 
import javax.servlet.http.HttpSessionBindingEvent; 
import javax.servlet.http.HttpSessionEvent; 
import javax.servlet.http.HttpSessionListener; 
 
public class LoggedUserCounter implements HttpSessionListener, HttpSessionAttributeListener { 
	 
	private static int count = 0; 
	 
	public void sessionCreated(HttpSessionEvent event) { 
System.out.println("------------session created!"); 
	} 
 
	public void sessionDestroyed(HttpSessionEvent event) { 
	} 
 
	public void attributeAdded(HttpSessionBindingEvent event) { 
		if(event.getName().equals("admin") && ((String)event.getValue()).equals("admin")) { 
			count ++; 
			System.out.println("a user logged in ! now total :" + count); 
		} 
	} 
 
	public void attributeRemoved(HttpSessionBindingEvent arg0) { 
		 
	} 
 
	public void attributeReplaced(HttpSessionBindingEvent arg0) { 
		 
	} 
 
}