jsp在线考试系统-bean文件

　　一个在线考试系统，测试你的jsp知识，代码不是特别多，所以不加注释了(http://jspbbs.yeah.net)

　　QuizResponses.java

　　answer.jsp

　　<%-- include="" directive="">

　　<%@ include="" file="header.html">

　　<%-- the="" method="" was="" set="" up="" in="" bean="" with="" id="">

　　<%-- All Java code is enclosed in <%>, leaving HTML to be easily --%>

　　<%-- changed="" or="" updated.="">

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　　<%-- scoring="" calculations="">

　　<%

　　int missed = 10 - score;

　　double grade = (double)score/10*100;

　　%>

　　Quizzes

　　Index

　　JSP Professional, Chapter 12 Quiz

　　Answers

　　by Dan Malks

　　<TABLE BORDER="0" CELLSPACING="8" CELLPADDING="2"

　　<%-- page="" directive="" that="" applies="" to="" entire="" page.="">

　　<%@ page="" language="java">

　　<%-- identifies="" bean="" as="" and="" tells="" the="" page="" where="" to="" locate="" bean.="">

　　<%-- set="" bean="" properties="" with="" a="" wildcard.="">

　　<%-- scoring="">

　　<%-- variable="" declaration="" in="" code="" scriptlet="" --="">

　　<% int="" score="0;">

　　1.

　　D

　　is correct!

　　is incorrect!

　　Blank X

　　Every JavaServer PagesTM

　　(JSP)TMsource page is compiled into

　　a servlet before it is executed at runtime.

　　2.

　　B

　　is correct!

　　is

　　incorrect

　　Blank

　　X

　　When large amounts of Java scriptlet code are mixed with HTML markup

　　within a JSP page, not only do readability and reuse suffer, but often

　　bugs are introduced as web-production team members, who may not be

　　familiar with Java programming, need to modify the accompanying markup.

　　Additionally, dependencies now exist among various teams competing for the

　　 file, making the development process less efficient.

　　3.

　　D

　　is correct!

　　is

　　incorrect

　　Blank X

　　Doing an HTTP redirect requires a round-trip to the client. If this

　　is not required, and the only desire is to forward the request to

　　another resource, then this can be much more efficiently accomplished

　　with the RequestDispatcher. Additionally, when using the

　　dispatcher the state of the request object is maintained between

　　resources, which will not be the case with the HTTP redirect.

　　4.

　　C

　　is correct!

　　is

　　incorrect

　　Blank X

　　Business logic is better contained in a

　　JavaBeanTM or a servlet, which is

　　owned by a software developer. When lots of Java code is embedded

　　directly within the JSP page as scriptlets, the

　　&quot;cut-and-paste&quot; mentality tends to prevail when it comes

　　to code reuse.

　　5.

　　Ais correct!

　　is

　　incorrect

　　Blank X

　　Since the servlet is the initial contact point for each request, it is

　　well-suited to handle logic that is common across multiple requests.

　　A good example of this type of logic is an authentication check.

　　6.

　　Bis correct!

　　is

　　incorrect

　　Blank X

　　Using a business delegate reduces coupling between the presentation

　　and business tiers. The presentation tier has no knowledge of the

　　EJB implementation details, such as Java Naming and Directory

　　InterfaceTM lookup.

　　7.

　　Bis correct!

　　is

　　incorrect

　　Blank X

　　Using Java scriptlets is the accepted method of doing iteration in

　　JSPTM 1.0. In

　　JSPTM 1.1, a custom tag may be used,

　　which will hide the implementation details of the iteration code.

　　8.

　　Ais correct!

　　is

　　incorrect

　　Blank

　　X

　　The term Page-Centric is used to describe an architecture where

　　the initial contact point for the request is a JSP page. An example

　　is shown visually below:

　　9.

　　Ais correct!

　　is

　　incorrect

　　Blank X

　　When the forward method is used, the invoking resource does not regain

　　control. Multiple include invocations can be made from the 

　　resource, while the invoking resource maintains execution control.

　　10.

　　Dis correct!

　　is

　　incorrect

　　Blank X

　　Error pages are invoked when there is an uncaught exception from

　　within a particular page. In this case, we mention that the

　　validationGaurd() method might throw an exception.

　　If this exception is not caught within the page, then we vector

　　control to the errorPage, as stipulated in the attribute

　　of the given page directive.

　　You missed<%= missed="">

　　Your score is<%= grade="">percent.

　　Source Code

　　This quiz used the Page-View with Bean Approach, detailed in <A

　　HREF="/developer/Books/javaservERPages/">Chapter 12, JSP Archeticure. The first

　　page of the quiz consists of regular HTML with a form that calls <A

　　HREF="answer.txt">answer.jsp. Answer.jsp requests parameters from the bean,

　　in this case, called QuizResponses. The page-view with bean

　　approach for this quiz required extra work to write the bean, and it could have been done using the

　　page-view approach without a bean, requesting invocation directly from the answer.jsp

　　page. Deciding which approach is preferrable depends on the application and how much HTML and Java

　　scriptlets need to be used. For this quiz we opted for the page-view with bean approach for

　　illustration purposes.

　　Back to Quiz

　　<%@ include="" file="footer.html">