TCP网络编程

使用TCP协议编写一个网络程序，设置服务器端的监听端口是8002，当与客户端建立连接后，服务器端向客户端发送数据“Hello, world”，客户端收到数据后打印输出。

package Tcp;import java.io.OutputStream; import java.net.*;public class ServerTest2 {public static void main(String[] args) throws Exception {    new TCPserver().listen();}} class TCPserver{ public void listen()throws Exception{ ServerSocket serverSocket = new ServerSocket(8002); Socket client = serverSocket.accept(); OutputStream os = client.getOutputStream(); os.write((“Hello Worls”).getBytes()); Thread.sleep(5000); System.out.println(“交互结束”); os.close(); client.close(); } }package Tcp;import java.io.InputStream; import java.net.*;public class ClientTest {public static void main(String[] args) throws Exception {    new TCPclient().connect();}} class TCPclient{ private static final int PORT = 8002; public void connect()throws Exception{ Socket client = new Socket(InetAddress.getLocalHost(),PORT);    InputStream is = client.getInputStream();    byte[] buf = new byte[1024];    int len = is.read(buf);    System.out.println(new String(buf,0,len));    client.close();}}