package jave;
import java.io.*;
import java.net.*;
/*先啟動Server*/
public class TCPServer {

	public static void main(String[] args) throws IOException {
		ServerSocket ss = new ServerSocket(6666);//監聽在6666埠上
		while(true) { //可以連線多個
			Socket s = ss.accept();//接收Client端的連線
			//接受Client端發來的東西
			DataInputStream dis = new DataInputStream(s.getInputStream());
			System.out.println(dis.readUTF());
			dis.close();
			s.close();
		}
	}
}
 

注意：Server只需啟動一次，切勿重複啟動，否則會出錯

package jave;
import java.io.*;
import java.net.*;

import org.omg.CORBA.portable.OutputStream;
public class TCPClient {

	public static void main(String[] args) throws UnknownHostException, IOException, InterruptedException {
		Socket s = new Socket("127.0.0.1", 6666);//申請連結
		//通過管道往Server裡寫東西
		java.io.OutputStream os =  s.getOutputStream();
		DataOutputStream dos = new DataOutputStream(os);
//		Thread.sleep(3000);//延遲3s讓Server讀取
		dos.writeUTF("Hello Server!");
		dos.flush();
		dos.close();
		s.close();
	}

}