How to read a text/html file in java regardless of its encoding?

Hi All,
How to read a text/html file in java regardless of its encoding?
1. Is there any way to identify that a file (read using FileInputStream/or any other means with java.io package) has been saved with which type of encoding i.e. whether the file is using ANSI encoding or Unicode encoding or other?
2. Is there any standard way to read an encoded file (i.e. files having UTF-16 format for Asian locales character support) and un-encoded file (i.e. files having ordinary ANSI format) correctly without knowing the user input?
The problem is that while creating an instance of 'InputStreamReader' (ISR) we can pass the encoding type used (otherwise it takes the system's default encoding type), and the ISR expects the file to be in the same encoding format otherwise it reads it as some junk. But we don't know which file the user is going to pass whether it is Unicode (for Asian locales file should be in Unicode) with or ANSI coded (for non-Asian / English locales user generally uses ANSI encoding).
Regards,
Sam

1. There is no reliable way of guessing the encoding of a file without that information. Thats why XML for example has very strict rules wrt. it's encoding (short form: use UTF-8 or UTF-16, if you use anything else, you'll have to specify it)
2. you might be able to make an educated guess if the possible range of encodings is limited, but it will probably never be 100% certain
3. The HTML file might have a header entry "<meta http-equiv..." that tells you about it's encoding. You could try to read the start of the file and see if you find that, then if you found it re-read the entire file.
regards

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