Is it possible to get file encoding?

Question

I am working with windows netsh util
/**filename = path to file*/
private static BufferedReader readFileWithBufferedReader(String filename){
        FileInputStream fis = null;
        InputStreamReader sr= null;
        BufferedReader r    = null;
        try {
            fis = new FileInputStream(filename);
        } catch (FileNotFoundException ex) {
            ex.printStackTrace();
        }//fis catch
        try {
            /*creating InputStreamReader with encoding param*/
            sr = new InputStreamReader(fis, "Cp866" /*"Cp1251"*/);
            System.out.println("encoding ::: " +sr.getEncoding());
        } catch (UnsupportedEncodingException ex) {
            ex.printStackTrace();
        }//sr catch
            /*wrapping to BufferedReader*/
            br = new BufferedReader( sr);
        System.out.println("YES!!!");   
        return br;
    }I get InputStream from console. I set encoding as "cp866" (it's O.K.)
Then, I save stream to file.
Then user can open this file and get config from file.
The problem is in open file procedure.
I do not know file encoding: it can be "cp1251" (windows cyrillic) or it can be "cp866" (cmd output).
So if user tries to open "cp1251" file with "cp866" encoding, he gets unreadable characters.
Is it possible to get file encoding and then re-create InputStreamReader with proper encoding?

Answer 1

Well, you can't get the file encoding. It's not saved with the file. Unless it's your file format, in which case you can save whatever you want.
There are apps that can guess a file's encoding.
Of course, if you have control over the files entirely, it shouldn't be a problem, and generally it'd make life a lot easier to just use UTF-8.
So if user tries to open "cp1251" file with "cp866" encoding,
he gets unreadable characters.what if you read a "cp866" with "cp1251" encoding?