jsp在线考试系统-been文件（1）
answer.jsp
<%-- Include directive --%>
<%@ include file="header.html" %>
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0">
<TR>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<DIV ALIGN="RIGHT">
<FONT SIZE="-1"><A HREF="/developer/Quizzes/index.html">Quizzes
Index</A></FONT></DIV>
<H2 ALIGN="RIGHT"><FONT COLOR="#FFFFFFF">JSP Professional, Chapter 12 Quiz
Answers</FONT></H2>
<H4 ALIGN="RIGHT"><EM>by Dan Malks</EM></H4> <BR><BR>
<TABLE BORDER="0" CELLSPACING="8" CELLPADDING="2" <TR><TD>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<%-- Page directive that applies to entire page. --%>
<%@ page language="java" %>
<%-- Identifies bean as "worker" and tells the page where to locate the bean. --%>
<jsp:useBean id="worker" class="jdc.quiz.QuizResponses" scope="request" />
<%-- Set bean properties with a wildcard. --%>
<jsp:setProperty name="worker" property="*" />
<%-- Scoring --%>
<%-- Variable declaration in code scriptlet -->
<% int score = 0; %>
<!-- Quiz Questions -->
<!-- Question 1 -->
<TR><TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">1.</FONT></TD>
<%-- The method getOne() was set up in the bean with the id "worker" --%>
<%-- All Java code is enclosed in <% %>, leaving HTML to be easily --%>
<%-- changed or updated. --%>
<% if((worker.getOne() != null) && ((worker.getOne()).equals("D"))) { score ++; %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif"> <B>D</B>
is correct!</FONT></TD>
<% } else if (worker.getOne() != null) { %>
<TD VALIGN="TOP"><FONT COLOR=red><jsp:getProperty name="worker" property="one" />
is incorrect!</FONT></TD>
<% } else { %>
<TD VALIGN="TOP">Blank <FONT COLOR=red>X</FONT></TD>
<% } %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
Every JavaServer Pages<SUP><FONT SIZE="-2">TM</FONT></SUP>
(JSP)<SUP><FONT SIZE="-2">TM</FONT></SUP>source page is compiled into
a servlet before it is executed at runtime.</A><BR><BR></FONT></TD></TR>
<!-- Question 2 -->
<TR><TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">2.</FONT></TD>
<% if ((worker.getTwo() != null) && ((worker.getTwo()).equals("B"))) { score ++; %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif"> <B>B</B>
is correct!<BR></FONT></TD>
<% } else if (worker.getTwo() != null) { %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<FONT COLOR=red><jsp:getProperty name="worker" property="two" /> is
incorrect</FONT></TD>
<% } else { %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
Blank
<FONT COLOR=red>X</FONT></FONT></TD>
<% } %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
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
same file, making the development process less efficient.
</FONT>
</TD></TR>
<!-- Question 3 -->
<TR><TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">3.</FONT></TD>
<% if ((worker.getThree() != null) && ((worker.getThree()).equals("D"))) { score ++; %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif"> <B>D</B>
is correct!<BR></FONT></TD>
<% } else if (worker.getThree() != null) { %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<FONT COLOR=red><jsp:getProperty name="worker" property="three" /> is
incorrect</FONT></FONT></TD>
<% } else { %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
Blank <FONT COLOR=red>X</FONT></FONT></TD>
<% } %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
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 <CODE>RequestDispatcher</CODE>. 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.
</FONT></TD></TR>
<!-- Question 4 -->
<TR><TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">4.</TD>
<% if ((worker.getFour() != null) && ((worker.getFour()).equals("C"))) { score ++; %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif"> <B>C</B>
is correct!<BR></FONT></TD>
<% } else if (worker.getFour() != null) { %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<FONT COLOR=red><jsp:getProperty name="worker" property="four" /> is
incorrect</FONT></FONT></TD>
<% } else { %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
Blank <FONT COLOR=red>X</FONT></FONT></TD>
<% } %>
<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
Business logic is better contained in a
JavaBean<SUP><FONT SIZE="-2">TM</FONT></SUP> 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
"cut-and-paste" mentality tends to prevail when it comes
to code reuse.
</FONT>
</TD></TR>
