How to get the format of the uploaded file ?

Hi !!
I am developing a web application, which allows user(client) to upload a file.
I have to place that file in corresponding directory like image, sound, text on server-side.Here........ I am facing a problem to find the Format of that file.
I used 'ImageInfo.java' to find the format of the image files and I am unable to find the format of the Text, Sound files.
if user changed the file name from 'file.txt' to 'file.jpg', the action class has to indentify it. Vice Versa......
Please Help me !!!!!
Thanks in Advance :-)

Thank you.
Yes, you are right!!!
But i am using ' org.apache.struts.upload ' package . where getContentType() method in this package, gets the mimeType of the file. Its returning the type- by its extension not by its (File)Format.
I don't know ... I am trying to find the solution.....
Once again thanks.........

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