电子政务应用

开发平台：

Java

LoggedUserCounter.java：源码内容

							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) {
		
	}
}

						