Java多个客户端同时连接服务端，在现实生活中用得比较多。同时执行多项任务，第一想到的当然是多线程了。下面用多线程来实现并发多连接。

import java.net.*;
import java.io.*;

public class ThreadServer extends Thread
{
     private Socket client;

     public ThreadServer(Socket c)
     {
         this.client=c;
     }

     public void run()
     {
         try
         {
             BufferedReader in=new BufferedReader(new InputStreamReader(client.getInputStream()));
             PrintWriter out=new PrintWriter(client.getOutputStream());
             //Mutil User but can't parallel

             while (true)
             {
                 String str=in.readLine();
                 System.out.println(str);
                 out.println("has receive....");
                 out.flush();
                 if (str.equals("end"))
                     break;
             }
             client.close();
         }
         catch (IOException ex)
         {
         }
         finally
         {

         }
     }
     public static void main(String[] args)throws IOException
     {
         ServerSocket server=new ServerSocket(8000);
         while (true)
         {
             //transfer location change Single User or Multi User

             ThreadServer mu=new ThreadServer(server.accept());
             mu.start();
         }
     }
}

一家之言，请多指教！