TestTCPServer
package socketdemo;

import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class TestTCPServer {
	public static void main(String[] args) throws IOException {
		ServerSocket ss = new ServerSocket(9999);
		while(true){
			System.out.println("----------服務端已經啟動------------");
			Socket s = ss.accept();
//			System.out.println(s.getLocalPort()+"  "+s.getPort()+"  "+s.getLocalAddress().getHostAddress());
//			System.out.println(s.getInetAddress().getHostAddress()+":"+s.getPort()+
//					"客戶端已經 連接上服務器ServerSocket");
			DataOutputStream dos = new DataOutputStream(s.getOutputStream());
			System.out.println("客戶端【"+s.getInetAddress().getHostAddress()+"::"+s.getPort()+"】已經連接");
			dos.writeUTF("服務器端寫入客戶端的數據：客戶端【"+s.getInetAddress().getHostAddress()+"::"+s.getPort()+
					"】已經連接上服務器端【"+s.getLocalAddress().getHostAddress()+"::"+s.getLocalPort()+"】！");
			dos.flush();
			dos.close();
			s.close();
		}
	}

}

TestTCPClient
package socketdemo;

import java.io.DataInputStream;
import java.io.IOException;
import java.net.Socket;

public class TestTCPClient {
	public static void main(String[] args)throws IOException {
		for(int i =0;i<5;i++){
			Socket s = new Socket("192.168.0.2",9999);
//			------------------------------------------
			DataInputStream dis = new DataInputStream(s.getInputStream());
			System.out.println("接收："+dis.readUTF());
			dis.close();
//			------------------------------------------
			s.close();
		}
	}
}