session的使用

package com.yuanze.listener;

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

public class TotalListener implements  HttpSessionListener
{
    
    public static int total=0;

    @Override
    public void sessionCreated(HttpSessionEvent se) {
        
        System.out.println("创建session");
        total++;
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent se) {
        
        System.out.println("销毁session");
        total--;
    }
    
    

}