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();	}}