Handling XMLHttp request in JSP

I have got an HTML file in which I have written JavaScript code to send XMLHttp request to a JSP file.

It is done using Open and Send methods of XMLHttp object.
Can anyone help me in handling this request in the JSP file?
I dont know how to receive this request in a JSP file. I have seen some methods in ASP, ie, by creating a XMLDOM object and loading the Request to that object. Is there any similar method in JSP to receive the request?

Please help me with code samples...

Thanks and Regards,
Jijesh