keepalive.java

用java做的网页即时聊天系统。可以用于学习网页即时聊天功能的开发

// Decompiled by Jad v1.5.8f. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.kpdus.com/jad.html
// Decompiler options: packimports(3) 
// Source File Name:   OpenCHAT.java

import java.io.PrintStream;

class keepAlive
    implements Runnable
{

    keepAlive(User User)
    {
        active = true;
        this.User = User;
    }

    public void run()
    {
        while(active) 
            try
            {
                doPing();
                Thread.sleep(20000L);
            }
            catch(Exception e) { }
    }

    boolean doPing()
    {
        if(System.currentTimeMillis() - User.lastTime > 20000L)
        {
            User.ps.print(" ");
            if(User.ps.checkError())
            {
                User.logout();
                return false;
            }
            User.lastTime = System.currentTimeMillis();
        }
        return true;
    }

    void stop()
    {
        active = false;
    }

    private User User;
    private boolean active;
}