单项选择题
A.Store the data in a public instance variable in the servlet.
B.Add an attribute to the request object before using the request dispatcher.
C.Add an attribute to the context object before using the request dispatcher.
D.This CANNOT be done as the tag handler has no means to extract this data.
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？（）
单项选择题 You have a use case in your web application that adds several session-scoped attributes. At the end of theuse case， one of these objects， the manager attribute， is removed and then it needs to decide which of theother session-scoped attributes to remove. How can this goal be accomplished？（）