package www;import java.io.IOException;import java.io.OutputStream;import java.net.InetAddress;import java.net.Socket;import java.net.UnknownHostException;        //客户机端，向服务器发送一串字符串    public class TestTcpC {    public static void main(String[] args) throws UnknownHostException, IOException {        //建立TCp的服务        Socket s = new Socket(InetAddress.getLocalHost(),9000);        //获取到Socket的输出流        OutputStream outputStream = s.getOutputStream();        //利用输出流对象把数据写出        outputStream.write("服务器端，你好".getBytes());        s.close();    }}

package com.oracle.www;import java.io.IOException;import java.io.InputStream;import java.net.ServerSocket;import java.net.Socket;        //服务器端，接受客户机发送的消息并输出  public class TestTcpS {    public static void main(String[] args) throws IOException {        //建立Tcp的服务端，并侦听一个端口        ServerSocket serverSocket = new ServerSocket(9000);        //接受客户端的连接        Socket socket = serverSocket.accept();        //获取输入流对象，读取客户端发送的内容        InputStream inputStream = socket.getInputStream();        byte [] buf = new byte[1024];        int length = 0;        length = inputStream.read(buf);        System.out.println(new String(buf, 0, length));        //关闭资源        serverSocket.close();        socket.close();        inputStream.close();    }}