How 2 get WINDOWS USERNAME in a JSP

Question

<%@ page import="sun.misc.BASE64Encoder" %>
<%
String auth = request.getHeader("Authorization");
if (auth == null) {
response.setStatus(response.SC_UNAUTHORIZED);
response.setHeader("WWW-Authenticate", "NTLM");
return;
if (auth.startsWith("NTLM ")) {
byte[] msg = new sun.misc.BASE64Decoder().decodeBuffer(auth.substring(5));
int off = 0, length, offset;
String s;
if (msg[8] == 1) {
off = 18;
byte z = 0;
byte[] msg1 = {(byte)'N', (byte)'T', (byte)'L', (byte)'M', (byte)'S',
(byte)'S', (byte)'P', z,
(byte)2, z, z, z, z, z, z, z,
(byte)40, z, z, z, (byte)1, (byte)130, z, z,
z, (byte)2, (byte)2, (byte)2, z, z, z, z, //
z, z, z, z, z, z, z, z};
response.setStatus(response.SC_UNAUTHORIZED);
response.setHeader("WWW-Authenticate", "NTLM "
+ new sun.misc.BASE64Encoder().encodeBuffer(msg1).trim());
return;
     else if (msg[8] == 3) {
off = 30;
length = msg[off+9]*256 + msg[off+8];
offset = msg[off+11]*256 + msg[off+10];
s = new String(msg, offset, length);
out.println(s + " ");
else
return;
%></BODY>

Answer 1

Please use Code tags
Any of theses answer your question?
Ohh, wait that code is a direct copy of the first two posts.
What is wrong with it?