how can I get username in my web application?

From: eeyimaya (eeyimaya_at_hotmail.com)
Date: 03/30/05 

Date: 30 Mar 2005 03:58:40 -0800

I use IIS 6.0 and Tomcat 5.5.7.

In IIS -> Directory Security -> Authentication Methods, I set the
"Digest Auth. for windows domain servers" checkbox so that users can
log on by domain username/passwords.

When user wants to enter the site windows login panel appears, after
entering the domain username/password user can login.

But I could not found a way to get the username in my jsp/servlet.
Is it possible? how?

Thanks...