bytes sent / recieved ?

[Albeeezz]

Hello,

I am a newbie programmer and I was wondering how i can "listen" to ports on my pc and read the bytes sent and recieved, very much like in windows how you double click on the "connection status" in the lower-right hand corner of the screen.

I have been told that the java.net* package can be used for this type of thing.

Can anyone please tell me the classes and methods involved in listening to, and getting the size of any incoming and outgoing packets?




Your help is greatly appreciated,


Albeeezz

[Belisarius]

While you can keep track of bits going out over a connection (as in a TCP connection), I'm not sure how you'd keep track of data going out over a *device* like Windows does (that strikes me as an OS level operation that's out of the scope of Java). You might be able to do it, but I honestly don't have a clue how.

[technobard]

Take at look at datagrams. Specificially, there is a DatagramSocket class. There is also a DatagramPacket class. The DatagramPacket has methods for setting the size of a packet for packets sent (outgoing). To receive packets, you have to specify the maximum allowed packet size. You'd have to write the specifics for tracking total bytes received for example, but it should be easily done based on the methods available (e.g. getlength(), getData() ). The problem with datagrams is that they do not guarantee delivery. Packets can arrive out of sequence or not at all.

Good luck! A google search on java.net DatagramPacket should give you more details.
Here's a good place to start: http://java.sun.com/j2se/1.4.2/docs/...ramPacket.html