See if this helps: http://www.exampledepot.com/egs/java.nio.charset/ConvertChar.html

On Sat, 12 Jan 2008 05:20:45 -0800 (PST), Mradul
<mradul.kaushik@gmail.com> wrote, quoted or indirectly quoted someone
who said :

Java works internally with 16-bit chars.  These are usually converted
to 8-bit chars or char-combos externally.  There are scores of
possible encodings.  Sometimes they are written with 16-bit Unicode
chars, bit or little endian, with or without BOMs.

see http://mindprod.com/jgloss/unicode.html
http://mindprod.com/jgloss/bom.html

You need to identify the one you need to generate. I  have written a
little utility to help.  See

http://mindprod.com/jgloss/applet/encodingrecogniser.html

You also need some background on encoding.

see http://mindprod.com/jgloss/encoding.html

You also need code to generate and read encoded files. See
http://mindprod.com/applet/fileio.html

Sorry to give you so much reading, but encodings are trickier than you
might first imagine.