Some japanese character encoded to "?". Please help me..

My system is below listed.
J2SE 1.4.1
MySql Ver 11.18 Distrib 3.23.52,
Resin 2.1.4
Java application load html document encoded 'SHIFT_JIS' using HtmlURLConnection.
And read the document in 'SHIFT_JIS'.
Almost it appears properly but some of characters printed in '?'.
hm....
I will show my source code.
private String readDocument(URL url) {
String METHOD_NM = ".readDocument()";
try {
HttpURLConnection URLCon = (HttpURLConnection)url.openConnection();
BufferedReader in = new BufferedReader( new InputStreamReader(url.openStream(), "SJIS"));
String inputLine;
On my web server, input the character(printed '?') on textbox in IE6(japanese language pack). and submit. then the character translated the code(ex> #4575; )
The code inserted DB. select from DB the tuple.
and display the IE6. it's ok.
but loaded from japanese html. It's inserted to DB '?'.
and displayed '?' on IE6.
I want to translate the character to code(ex> #5455;).
OK?
Please reply...
p.s I'm sorry my poor english..

Thank you for reply.
but I've already tried that.
I have tried all japanese encoding of "Supported Encodings" from java.
http://java.sun.com/j2se/1.3/docs/guide/intl/encoding.doc.html
I want to convert that.
ex)
?fe? => & # 4532; fe & # 3456; => original charcater is removed blank
This is convert '?' to code number.
In this case '?' is Japanese character.
Please let me know the way..

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