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Knowing what type of image one is manipulating

 
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Hello,
Suppose I get an inputstream from a web form.
1. How can I check that I have an image and not another type of binary file?
2. How do I know what type of image I have (jpg, or gif)?
Thanks in advance,
Julien.
 
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This piece of code might be useful:
from java almanac
 
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