how to choose java nio vs io?

Question

As we had known, If we want to use traditional IO to construct server, it must block somewhere, so we had to use loop or one thread one socket mode, So nio seem it is better

Answer 1

If you want non-blocking IO, NIO is not the better choice—it's the only choice in Java. Keep in mind that people still use the old IO regularly because it is way simpler to code against. NIO API is quite raw and is more of an enabling low-level technology than a client-side API. I suggest using NIO through an API that provides a simpler interface to the problems you want to solve using non-blocking IO.