test nat 打洞

import lombok.extern.slf4j.Slf4j;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

@Slf4j
public class UdpMain {
    public static void main(String[] args) {
        String targetIp = "182.239.92.228";//hk
        int port = 9294;
        try(DatagramSocket socket = new DatagramSocket(port)) {
            InetSocketAddress target = new InetSocketAddress(targetIp,port);
            DatagramPacket sendPacket = new DatagramPacket(new byte[1024],1024,target);
            DatagramPacket receivePacket = new DatagramPacket(new byte[1024],1024);
            //打洞
            sendPacket.setData("ping".getBytes());
            socket.send(sendPacket);
            new Thread(() -> {
                try {
                    sendPacket.setData("1".getBytes());
                    socket.send(sendPacket);
                }catch (Exception e) {
                    log.error(e.getMessage());
                }
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }).start();
            while (true) {
                socket.receive(receivePacket);
                String content = new String(receivePacket.getData(),receivePacket.getOffset(),receivePacket.getLength());
                log.info(content);
            }
        }catch (Exception e) {
            e.printStackTrace();
        }
    }
}