 |
| Screenshot of broadcast server and clients using java |
In this post we will see a java program which implements a broadcasting system. A Server can send a message as a multicast message into a multicast group. Any client can receive the multicasted packets after joining the group. The program make use of MulticastSocket class which is a subclass (derived class) of DatagramSocket class. Multicasting is almost same as UDP messaging. Datagram packets are used by MulticastSocket class. MulticastSocket class has two methods
joinGroup() and
leaveGroup(), each receive a InetAddress object as parameter which should be representing a multicast IP address. The datagrams sent using the MulticastSocket object should be addressed to a multicast group with IP between 224.0.0.0 and 239.255.255.255. These are IP addresses reserved for multicasting. The following java program to implement broadcasting using Multicast will tell you more.
