jsp在线考试系统-htm文件_MySQL

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JSP Professional, Chapter 12
Quiz

by Dan Malks

The HREF="/developer/Books/jsp/index.html">JSP Professional: Chapter 12, JSP Archictecture Test your knowledge on the differences between servlets and JSP, Factor Forward-Factor Back, page-centric verses the dispatcher approach, and more.

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1. Choose the statement
   that best describes the relationship between JavaServer
   Pages^TM (JSP^TM)
   and servlets:
   
   
   
   
   
   
   
   
   
   
   
   

   TYPE="RADIO" VALUE="A"> A.	Servlets are built on JSP semantics and all servlets are compiled to JSP pages for runtime usage
   TYPE="RADIO" VALUE="B"> B.	JSP and servlets are unrelated technologies
   TYPE="RADIO" VALUE="C"> C.	Servlets and JSP are competing technologies for handling web requests. Servlets are being superceded by JSP, which is preferred. The two technologies are not useful in combination.
   TYPE="RADIO" VALUE="D"> D.	JSPs are built on servlet semantics and all JSPs are compiled to servlets for runtime usage

   
   
   

   
   
   

2. What is a benefit of
   using JavaBeans^TM to separate business logic
   from presentation markup within the JSP environment?
   
   
   
   
   
   
   
   
   
   
   
   

   TYPE="RADIO" VALUE="A"> A.	It allows the JSP to access middleware
   TYPE="RADIO" VALUE="B"> B.	It creates a cleaner role separation between the web-production team and the software development team, so that the web-production team can focus on presentation markup, while the software team can focus on building reusable software components for helping to generate dynamic displays
   TYPE="RADIO" VALUE="C"> C.	It provides a dynamic markup environment, such that JavaBeans are integrated seamlessly with the template presentation content, in order to create the dynamic display for the client
   TYPE="RADIO" VALUE="D"> D.	It provides the developer with full access to the JavaTM 2 Platform Enterprise Edition (J2EETM), which is unavailable from outside the JavaBean environment

   
   

   
   
   
   

3. Why use the
   RequestDispatcher to forward a request to another resource,
   instead of doing a sendRedirect?
   
   
   
   
   
   
   
   
   
   
   
   

   TYPE="RADIO" VALUE="A"> A.	Redirects are no longer supported in the current servlet API
   TYPE="RADIO" VALUE="B"> B.	Redirects are not a cross-platform portable mechanism
   TYPE="RADIO" VALUE="C"> C.	The RequestDispatcher does not use the reflection API
   TYPE="RADIO" VALUE="D"> D.	The RequestDispatcher does not require a round trip to the client, and thus is more efficient and allows the server to maintain request state

   
   
   

   
   
   
   

4. What alternatives exist
   to embedding Java code directly within the HTML markup of your JSP page?
   
   
   
   
   
   
   
   
   
   
   
   

   TYPE="RADIO" VALUE="A"> A.	Moving the code into your session manager
   TYPE="RADIO" VALUE="B"> B.	Moving the code into sciptlets
   TYPE="RADIO" VALUE="C"> C.	Moving the code into JavaBeans and servlets
   TYPE="RADIO" VALUE="D"> D.	Moving the code into a transaction manager

   
   

   
   
   
   

5. What type of scriptlet
   code is better-suited to being factored forward into a servlet?
   
   
   
   
   
   
   
   
   
   
   
   
   

   TYPE="RADIO" VALUE="A"> A.	Code that deals with logic that is common across requests
   TYPE="RADIO" VALUE="B"> B.	Code that deals with logic that is vendor specific
   TYPE="RADIO" VALUE="C"> C.	Code that deals with logic that relates to database access
   TYPE="RADIO" VALUE="D"> D.	Code that deals with logic that relates to client scope

   
   
   

   
   
   
   

6. Choose the statement that
   best describes how to connect JSP pages and EJBs
   
   
   
   
   
   
   
   
   
   
   
   

   TYPE="RADIO" VALUE="A"> A.	Lookup the EJBs from within a JSP, but use the EJBs from within a basic JavaBean
   TYPE="RADIO" VALUE="B"> B.	Lookup and use the EJBs from a separate business delegate. The JavaBeans that work with JSP pages are clients to these business delegates and know nothing about EJB specifics
   TYPE="RADIO" VALUE="C"> C.	Lookup and use the EJBs from within a JSP page, but only as remote references
   TYPE="RADIO" VALUE="D"> D.	Lookup the EJBs from within a servlet, delegating usage to specific JSP pages

   
   
   

   
   
   
   

7. Are custom tags
   available in JSP 1.0? If not, how else might you implement iteration from
   within a JSP?
   
   
   
   
   
   
   
   
   
   
   
   

   TYPE="RADIO" VALUE="A"> A.	Yes, but the only tags available relate to database access
   TYPE="RADIO" VALUE="B"> B.	No. To iterate over a collection of values, one must use scriptlet code
   TYPE="RADIO" VALUE="C"> C.	No, but there is a standard <iterate> tag that may be used
   TYPE="RADIO" VALUE="D"> D.	Yes, but custom tags will not help developers create tags for use in iterating over a collection

   
   
   

   
   
   
   

8. What is the initial
   contact point for handling a web request in a Page-Centric architecture?
   
   
   
   
   
   
   
   
   
   
   
   
   

   TYPE="RADIO" VALUE= "A"> A.	A JSP page
   TYPE="RADIO" VALUE= "B"> B.	A JavaBean
   TYPE="RADIO" VALUE= "C"> C.	A servlet
   TYPE="RADIO" VALUE= "D"> D.	A session manager

   
   
   

   
   
   
   

9. What is the difference
   between doing an include or a forward with a
   RequestDispatcher?
   
   
   
   
   
   
   
   
   
   
   
   

   TYPE="RADIO" VALUE="A"> A.	The forward method transfers control to the designated resource, while the include method invokes the designated resource, substitutes its output dynamically in the display, and returns control to the calling page.
   TYPE="RADIO" VALUE="B"> B.	The two methods provide the same functionality, but with different levels of persistence
   TYPE="RADIO" VALUE="C"> C.	The forward method is deprecated as of JSP 1.1 and the include method should be used in order to substitue portions of a dynamic display at runtime
   TYPE="RADIO" VALUE="D"> D.	The include method transfers control to a dynamic resource, while the forward method allows for dynamic substitution of another JPS pages output, returning control to the calling resource

   
   
   

   
   
   

10. What line of code below
    might be combined in the same JSP page with a validation guard (for
    example, <% bean.validationGuard(); %> ), in order to create
    an alternate flow of control for scenarios in which exceptions arise. The
    validationGaurd method might throw an exception, which should cause
    the flow of control to continue in another user-defined page (assume JSP
    1.0)
    
    
    
    
    
    
    
    
    
    
    
    

    TYPE="RADIO" VALUE="A"> A.	<jsp:error page="errorPage.jsp" guard="true" />
    TYPE="RADIO" VALUE="B"> B.	<%@ page language="java" buffer="8k" %>
    TYPE="RADIO" VALUE="C"> C.	<jsp:useBean id="bean" class="examples.Bean" scope="request" />
    TYPE="RADIO" VALUE="D"> D.	<%@ page language="java" errorPage="errorPage.jsp" buffer="8k" %>