Sending to a Multicast Group
You can send to a multicast socket using either a DatagramSocket
or a MulticastSocket. What makes it multicast is the address that
is in the datagram. If the address is a multicast address, the
datagram will reach the multicast members in the group. You only need
to use MulticastSocket if you want to control the time-to-live of
the datagram.
byte[] outbuf = new byte[1024];
int port = 1234;
try {
DatagramSocket socket = new DatagramSocket();
InetAddress groupAddr = InetAddress.getByName("228.1.2.3");
DatagramPacket packet = new DatagramPacket(outbuf, outbuf.length, groupAddr, port);
socket.send(packet);
} catch (SocketException e) {
} catch (IOException e) {
}
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