Multicast Group

import java.net.InetAddress;
import java.net.MulticastSocket;
//j  ava 2 s .  c  o m
public class Main {
  public static void main(String[] argv) throws Exception {

    String groupName = "groupName";
    int port = 1024;
    MulticastSocket msocket = new MulticastSocket(port);
    InetAddress group = InetAddress.getByName(groupName);
    msocket.joinGroup(group);

  }
}

import java.net.DatagramPacket;
import java.net.MulticastSocket;
// j  a v a  2s .  co m
public class Main {
  public static void main(String[] argv) throws Exception {

    MulticastSocket msocket = new MulticastSocket(9999);
    byte[] inbuf = new byte[1024];
    DatagramPacket packet = new DatagramPacket(inbuf, inbuf.length);

    msocket.receive(packet);

    // Data is now in inbuf
    int numBytesReceived = packet.getLength();
  }
}

import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
//j  av a  2s. c  o m
public class MainClass {

  public static void main(String[] args) throws Exception {

    int port = 0;
    byte ttl = (byte) 1;

    InetAddress ia = InetAddress.getByName("127.0.0.1");

    byte[] data = "Here's some multicast data\r\n".getBytes();
    DatagramPacket dp = new DatagramPacket(data, data.length, ia, port);

    MulticastSocket ms = new MulticastSocket();
    ms.joinGroup(ia);
    for (int i = 1; i < 10; i++) {
      ms.send(dp, ttl);
    }
    ms.leaveGroup(ia);
    ms.close();
  }

}