ImageIO - get image type and exif data

Question

Given some source file (or more generic - input stream), I need to find out

• is it an image
• if it is an image, then retrieve its type (png/jpeg/gif/etc

Answer 1

Last time I had to do this, a couple of years ago, the standard API couldn't read EXIF data. This library can do so though:

http://www.drewnoakes.com/code/exif/