How to copy the resource files into my packaged folder in the build time?

["sean.chen(陈思淼)" <ch...@gmail.com>]

I define my own pakcaging type just like ear but have some customer file
type process.but sometimes, the project have some resources outside the
project.
I should copy that resources to that, in ant, i just use <copy> tag it
works.
but in maven, how can i copy the file to the folder? Is the antrun plugin
can do this kind of things?