下面的源代码分为4个文件；
chessClient.java:客户端主程序。
chessInterface.java:客户端的界面。
chessPad.java:棋盘的绘制。
chessServer.java:服务器端。
可同时容纳50个人同时在线下棋，聊天。
没有加上详细注释，不过绝对可以运行，j2sdk1.4下通过。


/*********************************************************************************************
1.chessClient.java
**********************************************************************************************/

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.util.*;

class clientThread extends Thread
{
 chessClient chessclient;

 clientThread(chessClient chessclient)
 {
  this.chessclient=chessclient;
 }

 public void acceptMessage(String recMessage)
 {
  if(recMessage.startsWith("/userlist "))
  {
   StringTokenizer userToken=new StringTokenizer(recMessage," ");
   int userNumber=0;

   chessclient.userpad.userList.removeAll();
   chessclient.inputpad.userChoice.removeAll();
   chessclient.inputpad.userChoice.addItem("所有人");
   while(userToken.hasMoreTokens())
   {
    String user=(String)userToken.nextToken(" ");
    if(userNumber>0 && !user.startsWith("[inchess]"))
    {
     chessclient.userpad.userList.add(user);
     chessclient.inputpad.userChoice.addItem(user);
    }

    userNumber++;
   }
   chessclient.inputpad.userChoice.select("所有人");
  }
  else if(recMessage.startsWith("/yourname "))
  {
   chessclient.chessClientName=recMessage.substring(10);
   chessclient.setTitle("Java五子棋客户端   "+"用户名:"+chessclient.chessClientName);
  }
  else if(recMessage.equals("/reject"))
  {
   try
   {
    chessclient.chesspad.statusText.setText("不能加入游戏");
    chessclient.controlpad.cancelGameButton.setEnabled(false);
    chessclient.controlpad.joinGameButton.setEnabled(true);
    chessclient.controlpad.creatGameButton.setEnabled(true);
   }
   catch(Exception ef)
   {
    chessclient.chatpad.chatLineArea.setText("chessclient.chesspad.chessSocket.close无法关闭");
   }
   chessclient.controlpad.joinGameButton.setEnabled(true);
  }
  else if(recMessage.startsWith("/peer "))
  {
   chessclient.chesspad.chessPeerName=recMessage.substring(6);
   if(chessclient.isServer)
   {
    chessclient.chesspad.chessColor=1;
    chessclient.chesspad.isMouseEnabled=true;
    chessclient.chesspad.statusText.setText("请黑棋下子");
   }
   else if(chessclient.isClient)
   {
    chessclient.chesspad.chessColor=-1;
    chessclient.chesspad.statusText.setText("已加入游戏，等待对方下子...");
   }

  }
  else if(recMessage.equals("/youwin"))
  {
   chessclient.isOnChess=false;
   chessclient.chesspad.chessVictory(chessclient.chesspad.chessColor);
   chessclient.chesspad.statusText.setText("对方退出，请点放弃游戏退出连接");
   chessclient.chesspad.isMouseEnabled=false;
  }
  else if(recMessage.equals("/OK"))
  {
   chessclient.chesspad.statusText.setText("创建游戏成功，等待别人加入...");
  }
  else if(recMessage.equals("/error"))
  {
   chessclient.chatpad.chatLineArea.append("传输错误：请退出程序，重新加入 \n");
  }
  else
  {
   chessclient.chatpad.chatLineArea.append(recMessage+"\n");
   chessclient.chatpad.chatLineArea.setCaretPosition(
    chessclient.chatpad.chatLineArea.getText().length());
  }
 }

 public void run()
 {
     String message="";
     try
     {
   while(true)
   {
    messa

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