UDP and multicasting
Multicasting is a useful technique to use if you need to send messages to a group on a periodic basis. It uses a UDP server and one or more UDP clients. To illustrate this capability, we will create a simple time server. The server will send a date and time string to clients every second.
Multicasting will send an identical message to every member of a group. A group is identified by a multicast address. A multicast address must use the following IP address range: 224.0.0.0 through 239.255.255.255. The server will send a message mark with this address. Clients must join the group before they can receive any multicast messages.
Creating a multicast server
A MulticastServer class is declared next, where a DatagramSocket instance ...
Get Learning Network Programming with Java now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
