How to use java to listen to a socket?

i want to create a listener to monitor the input and output of a very socket,i don't know which classes can be used.
thk u very much!!!!!!

You can't create a socket in java to 'monitor the output'. At least not in the general sense.
In the general sense this is usually referred to as raw sockets and the default java does not do that. You can however, do it via JNI. If that is what you had in mind then look at http://www.goto.info.waseda.ac.jp/~fujii/jpcap/index.html
If this isn't what you are looking for then provide a bit more detail about what you will be monitoring.

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