How to send datagram to other machines from one ip address to another ip address in java

Question

I want to send some messages to other machines by using UDP protocol in Java. And I knew my ip address and the broadcast address it should advertise on. Like my ip address is 127.0.0.1, and the I the other address is 127.0.0.200. I want to broadcast the message to machines with addresses from 127.0.0.1 to 127.0.0.200. How to implement this in Java?

And the range of ip address may be 127.0.0.1 to 127.1.4.80.

I am a beginner and I just know I should use InetAddress type to express the ip address. But I don't know how to iterate all the InetAddress objects.

Could someone help me?

Thanks a lot!!

score 0 · Answer 1 · answered May 03 '13 at 08:14

0

You need:

A DatagramSocket.
Some data in a byte[] array.
A target address:port, expressed as an InetSocketAddress.
A DatagramPacket, created from the byte[] array and the target address.
DatagramSocket.send().

You can't use 127. anything if you want to talk to other hosts. Those addresses are localhost-only.

answered May 03 '13 at 08:14

user207421

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does DatagramSocket.send() asynchronous? – tonyo May 03 '13 at 08:36
No it *is* not asynchronous. If that's part of your requirement it should be stated in your question. – user207421 May 03 '13 at 09:19

How to send datagram to other machines from one ip address to another ip address in java

1 Answers1