How to use XBox controller to move car in TestFancyCar.java

I am a n00b trying to learn some game programming. I have been playing with the test projects in the tutorials, and I cannot find anything about how to add inputs other than keyboard/mouse. I was hoping to implement analog steering with the joysticks on an xbox controller. Can anyone point me in the right direction?

http://code.google.com/p/jmonkeyengine/source/browse/trunk/engine/src/test/jme3test/input/TestJoystick.java