How can I make a Packet Sniffer in Java?

Is there anyone who can tell me where to start to look for the information needed to make a packet sniffer in Java? I've already programmed internet-type applications before, but I would like to know how to access the recieved data packets before they reach their intended port. So, just tell me a way to do that if you already know; otherwise, just tell me where to look for some information about it. Thank you.

Short answer: Anythings possible
Medium answer: I think you are actually going to talk to the 'chip' on your network device to tell it to pass messages to your listener too. From what I understand most of these devices simple won't pass those not meant for it's own ID(some long number, each device unique, yes, in the world). So you need some hardware.
Since communicating with the hardware is not something Java is good at, probably you would need some kind of native language interface.
Here's somebody who has done just that.
http://forum.java.sun.com/thread.jsp?forum=52&thread=95001

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How can I make a Packet Sniffer in Java?

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