How to get the length of a audio file without play it ?

Now I know a method to get the length of a audio file by play it:
1 Create a Player, and add a ControllerListener
2.Start the Player
3.In the ControllerListener's controllerUpdate method, use getMediaTime() by receiving a EndOfMediaEvent
However I think this method is not convenience, if I don't want to play it how I can get the length of the audio file?
Is anyone can help me?Really thanks a lot !

I got the answer here:
http://forum.java.sun.com/thread.jspa?threadID=5149132&tstart=15
I tried getDuration() before, but it always return a same time, I think maybe I didn't realize the player.

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