The GzipCompressorOutputStream#writeHeader() uses ISO_8859_1 to write the file name and comment. If the strings contains non-ISO_8859_1 characters, unknown characters are displayed after decompression. Use percent encoding for non ISO_8859_1 characters.

The GzipCompressorOutputStream#writeHeader method uses the ISO_8859_1 to write the file name. 
If the file name contains non-ISO_8859_1 characters, some unknown characters are displayed after decompression.
 Can change the ISO_8859_1 to UTF-8? 
        if (filename != null)

{             out.write(filename.getBytes(ISO_8859_1));             out.write(0);         }