1Z0-858最も有効な質問と解答で勉強

Your web site has many user-customizable features, for example font and color
preferences on web pages. Your IT department has already built a subsystem for user preferences using the Java SE platform's lang.util.prefs package APIs, and you have been ordered to reuse this subsystem in your web application. You need to create an event listener that constructs the preferences factory and stores it in the application scope for later use. Furthermore, this factory requires that the URL to a database must be declared in the deployment descriptor like this:
42.
<context-param>
43.
<param-name>prefsDbURL</param-name>
44.
<param-value>
45.
jdbc:pointbase:server://dbhost:4747/prefsDB
46.
</param-value>
47.
</context-param>
Which partial listener class will accomplish this goal?

• A. public class PrefsFactoryInitializer implements ContextListener {
  public void contextInitialized(ServletContextEvent e) {
  ServletContext ctx = e.getContext();
  String prefsURL = ctx.getParameter("prefsDbURL");
  PreferencesFactory myFactory = makeFactory(prefsURL);
  ctx.putAttribute("myPrefsFactory", myFactory);
  }
  // more code here
  }
• B. public class PrefsFactoryInitializer implements ServletContextListener {
  public void contextInitialized(ServletContextEvent e) {
  ServletContext ctx = e.getServletContext();
  String prefsURL = ctx.getInitParameter("prefsDbURL");
  PreferencesFactory myFactory = makeFactory(prefsURL);
  ctx.setAttribute("myPrefsFactory", myFactory);
  }
  // more code here }
• C. public class PrefsFactoryInitializer implements ContextListener {
  public void contextCreated(ServletContext ctx) {
  String prefsURL = ctx.getParameter("prefsDbURL");
  PreferencesFactory myFactory = makeFactory(prefsURL);
  ctx.putAttribute("myPrefsFactory", myFactory);
  }
  // more code here
  }
• D. public class PrefsFactoryInitializer implements ServletContextListener {
  public void contextCreated(ServletContext ctx) {
  String prefsURL = ctx.getInitParameter("prefsDbURL");
  PreferencesFactory myFactory = makeFactory(prefsURL);
  ctx.setAttribute("myPrefsFactory", myFactory);
  }
  // more code here
  }

Given an HttpServletRequest request and HttpServletResponse response, which sets a cookie "username" with the value "joe" in a servlet?

• A. response.addCookie("username", "joe")
• B. response.addCookie(new Cookie("username", "joe"))
• C. request.addCookie(new Cookie("username", "joe"))
• D. request.addCookie("username", "joe")
• E. request.addHeader(new Cookie("username", "joe"))
• F. request.setCookie("username", "joe")
• G. response.addHeader(new Cookie("username", "joe"))

Given: http://com.example/myServlet.jsp?num=one&num=two&num=three Which two produce the output "one, two and three"? (Choose two.)

• A. ${parameterValues["num"]["0"]}, ${parameterValues["num"]["1"]} and ${parameterValues["num"]["2"]}
• B. ${parameterValues.num[0]}, ${parameterValues.num[1]} and ${parameterValues.num[2]}
• C. ${param.num[0],[1] and [2]}
• D. ${paramValues.num[0]}, ${paramValues.num[1]} and ${paramValues.num[2]}
• E. ${param.num[0]}, ${param.num[1]} and ${param.num[2]}
• F. ${paramValues["num"][0]}, ${paramValues["num"][1]} and ${paramValues["num"][2]}
• G. ${paramValues[0],[1] and [2]}

Which implicit object is used in a JSP page to retrieve values associated with <contextparam> entries in the deployment descriptor?

• A. config
• B. application
• C. request
• D. session

You have been contracted to create a web site for a free dating service. One feature is the ability for one client to send a message to another client, which is displayed in the latter
client's private page. Your contract explicitly states that security is a high priority. Therefore, you need to prevent cross-site hacking in which one user inserts JavaScript code that is then rendered and invoked when another user views that content. Which two JSTL code snippets will prevent cross-site hacking in the scenario above? (Choose two.)

• A. <c:out>${message}</c:out>
• B. <c:out value='${message}' escapeXml='true' />
• C. <c:out value='${message}' eliminateXml='true' />
• D. <c:out eliminateXml='true'>${message}</c:out>
• E. <c:out value='${message}' />