usertracelistener.java

JSP线上水球游戏开发环境Tomcat 5.5.x + JDK 5.0（不要在JDK 1.4.x的JVM上跑）

package com.andowson.onlineuser;

import java.util.Queue;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import javax.servlet.http.HttpSessionActivationListener;
import javax.servlet.http.HttpSessionAttributeListener;

/**
 * UserTraceListener
 *
 * @version 0.0.2 2004/12/23
 * @author Andowson Chang
 */
public class UserTraceListener
       implements ServletContextListener,
                  HttpSessionListener,
                  HttpSessionActivationListener,
                  HttpSessionAttributeListener
{
    public static final String USERLIST_ATTRIBUTE_KEY = "userlist";

	  private UserList userlist = UserList.getInstance();
    private UserMessageQueue messagequeue = UserMessageQueue.getInstance();

    public UserTraceListener() {
    	  System.out.println("UserTraceListener constructed");
    }

    public void contextInitialized(ServletContextEvent sce) {
        System.out.println("ServletContext Initialized");
        sce.getServletContext().setAttribute(USERLIST_ATTRIBUTE_KEY, userlist);
    }

    public void contextDestroyed(ServletContextEvent sce) {
    	  System.out.println("ServletContext Destroyed");
    	  userlist.clear();
    	  messagequeue.clear();
    }

    public void sessionCreated(HttpSessionEvent hse) {
        HttpSession session = hse.getSession();
        System.out.println("Session " + session.getId() + " was created.");
    }

    public void sessionDestroyed(HttpSessionEvent hse) {
        HttpSession session = hse.getSession();
        System.out.println("Session " + session.getId() + " was destroyed.");
    }

    public void sessionDidActivate(HttpSessionEvent hse) {
    	  HttpSession session = hse.getSession();
    	  System.out.println("Session " + session.getId() + " DidActivate");
    }

    public void sessionWillPassivate(HttpSessionEvent hse) {
        HttpSession session = hse.getSession();
        System.out.println("Session " + session.getId() + " WillPassivate");
    }

	  // 讽Τ