How to get width and height of a jpg file ?

Hello,
I'm trying to insert a jpg file in a blob field on my database. The problem is that I need to get the file width and height in pixels. My class does not have a graphic interface, it's a batch. Does anybody has an idea of how can I do that ?
tia.

Write a jpeg decoder that can figure out how to determine the width/height of a jpeg file? Google it.
Or if you're really lazy, load each jpeg using the
Toolkit.loadImage( URL ) function and use getWidth/getHeight from there, but that's slow.

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