SUN 310-083 問題集

質問 1：
Which two actions protect a resource file from direct HTTP access within a web application? (Choose two.)
A. placing it in the /META-INF/secure directory
B. creating a <web-resource> element within the deployment descriptor
C. placing it in the /secure directory
D. creating a <secure-resource> element within the deployment descriptor
E. placing it in the /WEB-INF directory
正解：A,E

質問 2：
Which two are valid and equivalent? (Choose two.)
A. <jsp:declaration>int i;</jsp:declaration>
B. <%! int i; %>
C. <jsp:scriptlet>int i;</jsp:scriptlet>
D. <jsp:expr>int i;</jsp:expr>
E. <%= int i; %>
正解：A,B

質問 3：
Your web application requires the adding and deleting of many session attributes during a complex use case. A bug report has come in that indicates that an important session attribute is being deleted too soon and a NullPointerException is being thrown several interactions after the fact. You have decided to create a session event listener that will log when attributes are being deleted so you can track down when the attribute is erroneously being deleted.
Which listener class will accomplish this debugging goal?
A. Create an HttpSessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getName method on the event object.
B. Create an SessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getAttributeName method on the event object.
C. Create an HttpSessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getName method on the event object.
D. Create an SessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getAttributeName method on the event object.
正解：A

質問 4：
Which JSTL code snippet can be used to import content from another web resource?
A. Importing cannot be done in JSTL. A standard action must be used instead.
B. <c:import url="foo.jsp"/>
C. <c:import page="foo.jsp"/>
D. <c:include url="foo.jsp"/>
E. <c:include page="foo.jsp"/>
正解：B

質問 5：
Given:
6. <myTag:foo bar='42'>
7. <%="processing" %>
8. </myTag:foo>
and a custom tag handler for foo which extends TagSupport.
Which two are true about the tag handler referenced by foo? (Choose two.)
A. The doStartTag method is called once.
B. The EVAL_BODY_BUFFERED constant is a valid return value for the doStartTag method.
C. The SKIP_PAGE constant is a valid return value for the doStartTag method.
D. The doAfterBody method is NOT called.
E. The EVAL_PAGE constant is a valid return value for the doEndTag method.
正解：A,E

質問 6：
You have built a web application that you license to small businesses. The webapp uses a context parameter, called licenseExtension, which enables certain advanced features based on your client's license package. When a client pays for a specific service, you provide them with a license extension key that they insert into the <context-param> of the deployment descriptor. Not every client will have this context parameter so you need to create a context listener to set up a default value in the licenseExtension parameter. Which code snippet will accomplish this goal?
A. String ext = context.getAttribute('licenseExtension');
if ( ext == null ) {
context.setAttribute('licenseExtension', DEFAULT);
}
B. String ext = context.getInitParameter('licenseExtension');
if ( ext == null ) {
context.setInitParameter('licenseExtension', DEFAULT);
}
C. String ext = context.getParameter('licenseExtension');
if ( ext == null ) {
context.setParameter('licenseExtension', DEFAULT);
}
D. You cannot do this because context parameters CANNOT be altered programmatically.
E. String ext = context.getInitParameter('licenseExtension');
if ( ext == null ) {
context.resetInitParameter('licenseExtension', DEFAULT);
}
正解：D

質問 7：
Which method must be used to encode a URL passed as an argument to
HttpServletResponse.sendRedirect when using URL rewriting for session tracking?
A. HttpServletResponse.encodeRedirectURL
B. HttpServletResponse.encodeURL
C. ServletResponse.encodeURL
D. ServletResponse.encodeRedirectURL
正解：A