How to identify the encoding used in a file ?

Hi all,
I have to read a file and check it is encoded in UTF-8. How I can do this ?. If fiel is saved in MS Windows I can check for BOM. What if the file is saved using Java API ?. Is there any code(copy left code) available for doing this ?
rgds
Antony Paul

The problem is that ther eare no definite tests for character encoding. A particular byte stream can be valid in any number of different encodings (even if the resulting characters are not correct). If the characters don't happen to include any above unicode 127 then a UTF-8 stream is identical to the same characters in any number of different encodings.
It's not just a matter of there being no code for it in the library, it's impossible to do with any certainty, and to do it even probabalistically you'd have to run the results through a multi-lingual spelling checker.
If you just ask java.io to open a Reader without specifying an encoding it will assume the default encoding of your system.

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