java 怎么用UDP实时接收数据？

我自己写的代码：

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
public class UdpRecvDemo
{

    public static void main(String[] args) throws IOException
    {
        Recv();
    }
    
    public static void Recv() throws IOException
    {
        System.out.println("接受开始......");
        DatagramSocket ds = new DatagramSocket(3388);
        while(true)
        {
            byte[]buf = new byte[1024];
            DatagramPacket dp = new DatagramPacket(buf,buf.length);
            ds.receive(dp);
            System.out.println(ds);
            String ip = dp.getAddress().getHostAddress();
            int port = dp.getPort();
            String text = new String(dp.getData(),0,dp.getLength());
            if(text.equals("exit"))
                {
                    System.out.println(ip+"退出会话......");
                    break;
                }
            System.out.println(ip+":"+port+"===>me "+text);
        }

        ds.close();
    }
}