how to realize 'mouse picking' with JOGL?

how to realize ‘mouse picking’ with JOGL?
http://nehe.gamedev.net/ it gives the mouse picking code in LWJGL
http://pepijn.fab4.be/?page_id=34 this page shares many nehe lessons in jogl,but lesson32(shooting game ) is not given.

Can you tell me how to write the ‘mouse picking’ function in jogl?
thanks

oh~,I find the answer.
If you have the same question as me ,please access the follow page.
http://www.java-gaming.org/forums/index.php?topic=13086.0

and you can download this package
http://ak.kiet.le.googlepages.com/glredbook10.jar
It rewrite the redbook demos in jogl.