Java Library to drop the incoming packet flow

hi there,
i m planning to make application layer filter. i need to drop the flow of incoming packets. So can anyone suggest me any java library which is able do this?
or else if i have to create my own library then how can i proceed in that?

thnx oscar 4 ur reply...
actually i want to drop the incoming packets which r coming from restricted URL. means any how i want to restrict the user to see the particular webpage.
so if cant hav this low level API in java, then can u suggest me how to implement it in other way?..
i hav to make this project in JAVA only.
i have got one API named "libipq" (source: snort.org) which can drop the packet flow. But this API is for linux OS and i want to implement on windows... pls help

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