Server的原始碼：

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();
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new PrintWriter(socket.getOutputStream(),true);

String line = in.readLine();
System.out.println("The client  input is :" + line);
out.close();
in.close();
socket.close();
}
//ss.close();
}
catch (IOException e)
{}
}

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

Client的原始碼：

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

public class Client
{
Socket socket;
BufferedReader in;
PrintWriter out;

public Client()
{
try
{
socket = new Socket("127.0.0.1", 10000);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new PrintWriter(socket.getOutputStream(),true);
BufferedReader line = new BufferedReader(new InputStreamReader(System.in));

out.println(line.readLine());
line.close();
out.close();
in.close();
socket.close();
}

catch (IOException e)
{}
}

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

注：Server和Client分別是在兩臺不同的機子上執行的程式。由於執行在自己的電腦上，我把Server的IP設為127.0.0.1，Client的傳送埠號設定為Server的監聽埠號10000。