Hi Gangadhar

JSP was suns answer to ASP....JSP would be compiled into a servlet..however JSP is much easier to write..try writing a simple hello world application in jsp and in servlet you will appreciate JSP.

check out these sites

www.theserverside.com

www.ibm.com/developerworks

Or buy a book this is very good

Java for the Web with Servlets, JSP, and EJB: A Developer's Guide to J2EE Solutions
by Budi Kurniawan