socket

package test1;

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

public class TcpServer {
	public static void main(String[] args) throws Exception{
		//server在哪个端口上监听客户端的连接
		ServerSocket ssServerSocket=new ServerSocket(6666);
		//接受
		while (true){

		Socket s=ssServerSocket.accept();
		
		DataInputStream dis=new DataInputStream(s.getInputStream());
		System.out.println(dis.readUTF());
		
		
		dis.close();
		s.close();
		System.out.println("A client connect!");
		
		}
		
	}

}

　　

package test1;

import java.io.DataOutputStream;
import java.io.OutputStream;
import java.net.Socket;

public class TcpClient {
	public static void main(String[] args) throws Exception{

		//申请和服务器端链接
		Socket socket=new Socket("127.0.0.1",6666);
		
		//管道发送信息
		OutputStream osOutputStream=socket.getOutputStream();
		DataOutputStream doStream=new DataOutputStream(osOutputStream);
		
		doStream.writeUTF("hello");
		
		
		doStream.flush();
		doStream.close();
		socket.close();
	}
}