java Socket和Server Socket多线程编程

下面的代码是java socket客户端和服务端的源码程序

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package net.tcp;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class Server extends Thread
{
    ServerSocket server = null;
    Socket sk = null;
    BufferedReader rdr = null;
    PrintWriter wtr = null;
    public Server()
    {
        try
        {
            server = new ServerSocket(1987);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }
    public void run()
    {
        while (true)
            {
                System.out.println("Listenning...");
                try
                {
//                  每个请求交给一个线程去处理
                    sk = server.accept();
                    ServerThread th = new ServerThread(sk);
                    th.start();
                    sleep(1000);
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
                   
            }
    }
    public static void main(String [] args)
    {
        new Server().start();
    }
       
       
       
       
       
    class ServerThread extends Thread
    {
        Socket sk = null;
        public ServerThread(Socket sk)
        {
            this.sk = sk;
        }
        public void run()
        {
            try
            {
                wtr = new PrintWriter(sk.getOutputStream());
                rdr = new BufferedReader(new InputStreamReader(sk
                        .getInputStream()));
                String line = rdr.readLine();
                System.out.println("从客户端来的信息：" + line);
//              特别，下面这句得加上     “\n”,
                wtr.println("你好，服务器已经收到您的信息！'" + line + "'\n");
                wtr.flush();
                System.out.println("已经返回给客户端！");
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
               
        }
           
    }
}
客户端：
Java代码
1.package net.tcp;
2.
3.import java.io.BufferedReader;
4.import java.io.BufferedWriter;
5.import java.io.InputStreamReader;
6.import java.io.OutputStreamWriter;
7.import java.io.PrintWriter;
8.import java.net.Socket;
9.
10.public class Client extends Thread
11.{
12.
13.    Socket sk = null;
14.    BufferedReader reader = null;
15.    PrintWriter wtr = null;
16.    BufferedReader keyin = null;
17.
18.    public Client()
19.    {
20.        keyin = new BufferedReader(new InputStreamReader(System.in));
21.        try
22.        {
23.            sk = new Socket("127.0.0.1", 1987);
24.        }
25.        catch (Exception e)
26.        {
27.            e.printStackTrace();
28.        }
29.
30.    }
31.
32.    public void run()
33.    {
34.        try
35.        {
36.            reader = new BufferedReader(new InputStreamReader(sk
37.                    .getInputStream()));
38.            wtr = new PrintWriter(sk.getOutputStream());
39.            String get = keyin.readLine();
40.
41.            while (true)
42.            {
43.                if (get != null & get.length() > 0)
44.                {
45.                    wtr.println(get);
46.                    wtr.flush();
47.//                  wtr.close();
48.//                  System.out.println(get + "发送完毕");
49.                }
50.                if (reader != null)
51.                {
52.                    String line = reader.readLine();
53.                    System.out.println("从服务器来的信息：" + line);
54.                    
55.                }
56.                
57.            }
58.        }
59.        catch (Exception e)
60.        {
61.            e.printStackTrace();
62.        }
63.    }
64.http://wgyblog.com/html/166.html
65.    public static void main(String [] args)
66.    {
67.        new Client().start();
68.    }
69.}