Windows Ad Authentication using java

Hi,
My Requirement: We are using Java, JSP, Struts in our application.
We have a user login jsp page. Whenever user try signing by using the logiin page we have to use Ad(Active Directory) userid and Ad password available from operating system.
Can any one please suggest me how I can achieve this?
Thanks in advance
Best Regards,
Satish

1. Given a user name password and perhaps other information find out via the windows API how to 'log in'. This has nothing to do with java.
2. Write some C/C++ code that uses 1 to wrap that functionality in such a way that it describes what you want to do in your application. This has nothing to do with java.
3. Write a jni java class and C JNI code to wrap 2. This has something to do with java.

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How to set proxy authentication using java properties on the command line, or in Netbeans (Project => Properties
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import java.io.*;
import java.net.*;
public class DnldURLWithoutUsingProxy {
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      DataInputStream dis;
      String s;
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I have also tried the command without much luck either:
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Oops- an IOException happened.
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George

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