How to use the java class (dnsjava package) to implement the ping method

lianyi

Not allowed to call commands in java can only call existing java classes, how to implement, please master

sbsbaw

Following, I also want to know...

lijilkj

import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.DatagramPacket;
import java.io.IOException;

public class MyPing
{
    static final int echoPort = 7;
    static final int maxPingTime = 3000; // Milliseconds
    static final int pingPollInterval = 100; // Milliseconds

    public void ping(InetAddress dest)
    {
        String message = "test ping";
        byte[] outmsg = message.getBytes();
        int length = message.getBytes().length;
        byte[] inmsg = new byte[length];
        DatagramPacket outPacket = new DatagramPacket(outmsg, length);
        DatagramPacket inPacket = new DatagramPacket(inmsg, length);

        try
        {
            DatagramSocket socket = new DatagramSocket(echoPort, dest);
            outPacket.setAddress(dest);
            outPacket.setPort(echoPort);
            socket.send(outPacket);
            socket.setSoTimeout(5000);
            socket.receive(inPacket);
            System.out.println(new String(inmsg));
        }
        catch (SocketException e)
        {
            e.printStackTrace();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }

    }
}


import java.net.InetAddress;
import java.net.UnknownHostException;

class Tester
{
    public static void main(String[] a)
    {
        try
        {
            InetAddress addr = InetAddress.getLocalHost();
            new MyPing().ping(addr);
        }
        catch (UnknownHostException e)
        {
            e.printStackTrace();
        }
    }
}