mydatagramsocketa.java

3 pairs of sample codes for basic net apps: . Socket server/client . start the server first . Datagr

import java.net.*;


public class MyDatagramSocketA {
    public static void main(String[] args) {
        try {
            new MyDatagramSocketA().startToReceive();
        }
        catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    private void startToReceive() throws Exception{
        DatagramSocket socketA = new DatagramSocket(3001);

        byte buf[] = new byte[500];
        DatagramPacket receivedPacket = new DatagramPacket(buf, buf.length);
        socketA.receive(receivedPacket);
        System.out.println("AAA: data recieved from B: " + new String(receivedPacket.getData()));

        // send reply back to the sender of the above packet;
        byte msg[] = new String("Thanks.").getBytes();
        InetAddress remoteAddress = receivedPacket.getAddress();
        int remotePort = receivedPacket.getPort();
        DatagramPacket sendPacket = new DatagramPacket(msg, msg.length, remoteAddress, remotePort);
        socketA.send(sendPacket);

    }
}