单项选择题 Your web application uses a simple architecture in which servlets handle requests and then forward to aJSP using a request dispatcher. You need to pass information calculated by the servlet to the JSP；furthermore， that JSP uses a custom tag and must also process this information. This information mustNOT be accessible to any other servlet， JSP or session in the webapp. How can you accomplish this goal？（）

单项选择题 Given the web application deployment descriptor elements： 11.<filter> 12.<filter-name>ParamAdder</filter-name> 13.<filter-class>com.example.ParamAdder</filter-class> 14.</filter>... 24.<filter-mapping> 25.<filter-name>ParamAdder</filter-name> 26.<servlet-name>MyServlet</servlet-name> 27.<!-- insert element here --> 28.</filter-mapping> Which element， inserted at line 27，causes the ParamAdder filter to be applied when MyServlet is invokedby another servlet using the RequestDispatcher.include method？（）

单项选择题 Your web site has many user-customizable features， for example font and color preferences on web pages.Your IT department has already built a subsystem for user preferences using Java SE’s lang.util.prefspackage APIs and you have been ordered to reuse this subsystem in your web application. You need tocreate an event listener that stores the user’s Preference object when an HTTP session is created. Also，note that user identification information is stored in an HTTP cookie.  Which partial listener class canaccomplish this goal？（）