UDP/TCP mindless transfer class

[Luc The Perverse]

I wish to find a class, or make a set of classes for making file/data
transfer over a remote connection virtually mindless. I want the
following. (Keep in mind I CAN code these from a simple example, if someone
knows of one.) I still consider myself a java programming novice.

1. Can switch between active and passive (Active will block until current
transfer is complete, passive will allow queuing of files and serialized
objects)
2. Can easily "attach" an encryption/encoding scheme
3. Will work over TCP or UDP.
4. (This should be a no brainer) Can have multiple simultanious
instantiations of the class.
5. A thread safe progress reporter.

 

[Luc The Perverse]

I wish to find a class,

*snip*

Alright - I must have asked the wrong question.

Can someone show me any example of file x-fer over TCP or UDP that initiates
from one Java client and ends at another Java client? I can code the rest.