This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
Are you trying to read request parameters (the name/value pairs in the query string)? If so, have a look at the getParameter(), getParameterNames(), getParameterMap() and getParameterValues() methods of the HttpServletRequest object. Actually, those methods are inherited from the ServletRequest object.