sessionlistener.java

简单的在线聊天系统 jsp javabean entity

package com.chatroom.servlet;

import java.util.Date;
import java.util.Map;

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

import com.chatroom.bean.Chat;
import com.chatroom.bean.Room;
import com.chatroom.entity.Word;

public class SessionListener implements HttpSessionListener {

	public void sessionCreated(HttpSessionEvent arg0) {
		System.out.println("a session created");
	}

	public void sessionDestroyed(HttpSessionEvent arg0) {
		String nickname = arg0.getSession().getAttribute("nickname").toString();
		if (nickname == null || ("".equals(nickname.trim()))) {
			System.out.println("destroy a session without nickname");
		} else {
			Map map=Room.getRoom().allUsers;
			if(map.containsKey(nickname)){
				map.remove(nickname);
				long time=(new Date()).getTime();
				String content="<font color=gray>系统消息："+nickname+"离开了聊天室</font>";
				Chat.getChat().area.add(new Word(time,content));
			}else{
				System.out.println("destroy a session but it's nickname is not in the namelist");
			}
		}
	}

}