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();}

}