counterlistener.java

精通tomcat书籍原代码,希望大家共同学习

package com.utils;

import javax.servlet.http.*;

public class CounterListener implements HttpSessionListener
{
	public static int count;

	public CounterListener ()
	{
		count = 0;
	}
	
	//创建一个session时激发
	public void sessionCreated(HttpSessionEvent se)
	{
		count++;
	}

	//一个session失效时激发
	public void sessionDestroyed(HttpSessionEvent se)
	{
		if(count>0)
			count--;
	}
};