JavaFX: Get format (PNG, JPG..) of an image?

Question

I am creating an application that for some reasons shall only accept PNG images.

How can I check if an image is really a PNG image? Currently I am using the JavaFX 2 Image class to load the image.

Thanks for any hint!

score 2 · Answer 1 · edited May 23 '17 at 11:45

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If you don't trust the filename, a simple check is to read the first 8 bytes (with FileInputStream), and check that they correspond to the PNG signature (related: https://stackoverflow.com/a/10555053/277304)

edited May 23 '17 at 11:45

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answered Feb 16 '13 at 14:02

leonbloy

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That would be checking a mime type. – JoshDM Feb 16 '13 at 14:05
Thank you too! There's a handy way in Java 7, see my comment to Josh's reply. – stefan.at.kotlin Feb 16 '13 at 14:26

score 2 · Accepted Answer · edited May 23 '17 at 12:24

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I do this currently in my own application by confirming the file's Mime Type before I process it. There are several SO threads suggesting how to obtain Mime Types in Java.

edited May 23 '17 at 12:24

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answered Feb 16 '13 at 14:04

JoshDM

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I ended up Chris Mowforth's answer in http://stackoverflow.com/questions/51438/getting-a-files-mime-type-in-java: Java 7's Files.probeContentType(path) - works great in my case. So thanks for the hint :-) – stefan.at.kotlin Feb 16 '13 at 14:25

JavaFX: Get format (PNG, JPG..) of an image?

2 Answers2