MultiCastSender.java

//MultiCast is to send a message to a group of people

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;

public class MultiCastSender {

 public static void main(String[] args) {

 try {
 InetAddress group = InetAddress.getByName("225.4.5.6");

 MulticastSocket multicastSock = new MulticastSocket();

 Mensaje msg = new Mensaje("Hola desde el Sender, como estas ?", 9);

 //byte[] yourBytes = (byte[]) msg.getInSendingForm();

 System.out.println(msg);

 ByteArrayOutputStream bos = new ByteArrayOutputStream();
 ObjectOutput out = null;
 byte[] yourBytes =null;

 try {
 out = new ObjectOutputStream(bos);
 System.out.println("holaa 1");
 out.writeObject(msg);
 System.out.println("holaa 2");
 out.flush();
 System.out.println("holaa 3");
 yourBytes = bos.toByteArray();
 System.out.println("holaa 4");
 }finally {
 try {
 bos.close();
 } catch (IOException ex) {
 // ignore close exception
 }
 }


 DatagramPacket packet = new DatagramPacket(yourBytes, yourBytes.length, group, 3456);

 multicastSock.send(packet);

 multicastSock.close();

 } catch (Exception e) {
 e.printStackTrace();
 }

 }
}