Server端程序:

package test;

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

public class Server
{
 private ServerSocket ss;
 private Socket socket;
 private BufferedReader in;
 private PrintWriter out;
 
 public Server()
 {
  try
  {
   ss=new ServerSocket(10000);
   while(true)
   {
    socket = ss.accept();
    String RemoteIP = socket.getInetAddress().getHostAddress();
    String RemotePort = ":"+socket.getLocalPort();
    System.out.println("A client come in!IP:"+RemoteIP+RemotePort);
    in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    String line = in.readLine();
    /*if (line.equals("END"))
     break;*/
    System.out.println("Cleint send is :" + line);
    out = new PrintWriter(socket.getOutputStream(),true);
    out.println("Your Message Received!");
    out.close();
    in.close();
    socket.close();
   }
  }
  catch (IOException e)
  {
   out.println("wrong");
  }
 }

 public static void main(String[] args)
 {
  new Server();
 }
}

Client端程序:

package test;

import java.io.*;
import java.net.*;
 
public class Client
{
 private Socket socket;
 private BufferedReader in;
 private PrintWriter out;
 
 public Client()
 {
  try
  {
   System.out.println("Try to Connect to 127.0.0.1:10000");
   socket = new Socket("127.0.0.1",10000);
   System.out.println("The Server Connected!");
   System.out.println("Please enter some Character:");
   BufferedReader line = new BufferedReader(new InputStreamReader(System.in));
   out = new PrintWriter(socket.getOutputStream(),true);
   in = new BufferedReader(new InputStreamReader(socket.getInputStream())); 
   System.out.println(in.readLine());
   out.close();
   in.close();
   socket.close();　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　  }
  catch(IOException e)
  {
   out.println("Wrong");
  }
 }

 public static void main(String[] args)
 {
  new Client();
 }
}