package javase.net.socket; 

import java.io.DataInputStream; 
import java.io.DataOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.net.ServerSocket; 
import java.net.Socket; 

public class TCPServer { 
    public static void main(String[] args) { 
        try { 
            ServerSocket serverSocket = new ServerSocket(8888); 
            Socket socket = serverSocket.accept(); 
            // 讀取客戶端數據 
            InputStream info = socket.getInputStream(); 
            DataInputStream dis = new DataInputStream(info); 
            System.out.println(dis.readUTF()); 

            // 向客戶端輸出數據 
            OutputStream os = socket.getOutputStream(); 
            DataOutputStream dos = new DataOutputStream(os); 
            dos.writeUTF("Hello!"); 
            dos.flush(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
    } 
} 

package javase.net.socket; 

import java.io.DataInputStream; 
import java.io.DataOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.net.Socket; 
import java.net.UnknownHostException; 

public class TCPClient { 
    public static void main(String[] args) { 
        try { 
            Socket socket = new Socket("192.168.1.123", 8888); 
            // 向服務器端發送數據 
            OutputStream os =  socket.getOutputStream(); 
            DataOutputStream bos = new DataOutputStream(os); 
            bos.writeUTF("Connect"); 
            bos.flush(); 

            // 接收服務器端數據 
            InputStream is = socket.getInputStream(); 
            DataInputStream dis = new DataInputStream(is); 
            System.out.println(dis.readUTF()); 
        } catch (UnknownHostException e) { 
            e.printStackTrace(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
    } 
}