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最新的 SCWCD 310-083 免費考試真題:

1. As a convenience feature, your web pages include an Ajax request every five minutes to a special servlet that monitors the age of the user's session. The client-side JavaScript that handles the Ajax callback displays a message on the screen as the session ages. The Ajax call does NOT pass any cookies, but it passes the session ID in a request parameter called sessionID. In addition, assume that your webapp keeps a hashmap of session objects by the ID. Here is a partial implementation of this servlet:
10. public class SessionAgeServlet extends HttpServlet {
11. public void service(HttpServletRequest request, HttpServletResponse) throws
IOException {
1 2. String sessionID = request.getParameter("sessionID");
1 3. HttpSession session = getSession(sessionID);
1 4. long age = // your code here
1 5. response.getWriter().print(age);
1 6. }
... // more code here
4 7. }
Which code snippet on line 14, will determine the age of the session?

A) session.getLastAccessedTime() - session.getCreationTime();
B) session.getLastAccessed().getTime() - session.getCreationTime().getTime();
C) session.getLastAccessed() - session.getCreationTime();
D) session.getLastAccessedTime().getTime() - session.getCreationTime().getTime();
E) session.getMaxInactiveInterval() - session.getCreationTime();
F) session.getMaxInactiveInterval();

2. Which two about WAR files are true? (Choose two.)

A) WAR files must be located in the web application library directory.
B) WAR files must be created by using archive tools designed specifically for that purpose.
C) The web container must allow access to resources in JARs in the web application library directory.
D) WAR files must contain the web application deployment descriptor.
E) The web container must serve the content of any META-INF directory located in a WAR file.

3. A developer for the company web site has been told that users may turn off cookie support in their browsers. What must the developer do to ensure that these customers can still use the web application?

A) The developer can ignore this issue. Web containers are required to support automatic
URL rewriting when cookies are not supported.
B) The developer must provide an alternate mechanism for managing sessions and abandon the HttpSession mechanism entirely.
C) The developer must add the string id=<sessionid> to the end of every URL to ensure that the conversation with the browser can continue.
D) The developer must ensure that every URL is properly encoded using the appropriate
URL rewriting APIs.

4. Which ensures that a JSP response is of type "text/plain"?

A) <%@ page pageEncoding="text/plain" %>
B) <%@ page contentEncoding="text/plain" %>
C) <%@ page mimeType="text/plain" %>
D) <% response.setEncoding("text/plain"); %>
E) <% response.setMimeType("text/plain"); %>
F) <%@ page contentType="text/plain" %>

5. Given that a web application consists of two HttpServlet classes, ServletA and ServletB, and the ServletA.service method:
20. String key = "com.example.data";
21. session.setAttribute(key, "Hello");
22. Object value = session.getAttribute(key);
23.
Assume session is an HttpSession, and is not referenced anywhere else in ServletA.
Which two changes, taken together, ensure that value is equal to "Hello" on line 23?
(Choose two.)

A) enclose lines 21-22 in a synchronized block:
synchronized(session) {
session.setAttribute(key, "Hello");
value = session.getAttribute(key);
}
B) ensure that ServletB synchronizes on the session object when setting session attributes
C) ensure that the ServletB.service method is synchronized
D) ensure that the ServletA.service method is synchronized
E) enclose lines 21-22 in a synchronized block:
synchronized(this) {
session.setAttribute(key, "Hello");
value = session.getAttribute(key);
}

問題與答案：