Simple implementation of Java NTP protocol time synchronization client

A simple NTP client implemented in Java:

import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import org.apache.commons.net.ntp.NTPUDPClient;
import org.apache.commons.net.ntp.TimeInfo;
import org.apache.commons.net.ntp.TimeStamp;

public class NTPClient {
    
    

    public static void main(String[] args) {
    
    
        try {
    
    
            NTPUDPClient timeClient = new NTPUDPClient();
            String timeServerUrl = "130.149.17.21";
            InetAddress timeServerAddress = InetAddress.getByName(timeServerUrl);
            TimeInfo timeInfo = timeClient.getTime(timeServerAddress);
            TimeStamp timeStamp = timeInfo.getMessage().getTransmitTimeStamp();
            DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
            System.out.println("时间：" + dateFormat.format(timeStamp.getDate()));
        } catch (UnknownHostException e) {
    
    
            e.printStackTrace();
        } catch (IOException e) {
    
    
            e.printStackTrace();
        }
    }
}