the best way to talk to multiple UDP/TCP servers?

[Wang Weijun]

I'm writing a client which talks to 3 servers, and would like to write a method that

  sends request to server 1 at time 0:01
  sends request to server 2 at time 0:02
  sends request to server 3 at time 0:03
  sends request to server 1 at time 0:11
  sends request to server 2 at time 0:12
  sends request to server 3 at time 0:13
  waits until 0:20

During this whole period, whenever a response from a server is received, the method returns and no more request is sent. The protocol can be UDP or TCP. What is the best way I can do this with NIO?

Thanks
Max