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PART II
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Part II:
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Extending JavaServer Faces
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<td> <h1 align="center"> <h:graphicImage url="/images/vtlogojpg" alt="Virtual Trainer Logo"/> JSF Virtual Trainer Application </h1> </td> </tr> <tr> <td > <f:subview id="loginbar"> <jsp:include page="loginbarjsp"/> </f:subview> </td> </tr> <tr> <td> <h3>(Page Title)</h3> <!-- Page specific content goes here --> </td> </tr> </table> </h:form></body> </html> </f:view>
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A quick review of this page template code reveals the required JSF taglib directives followed by the CSS reference A Virtual Trainer shortcut icon is also defined in the header It serves as a small icon associated with the site/application and is rendered in certain browsers (such as Firefox) in the address bar as well as in the bookmarks Moving into the body of the page, you ll see that the rest of the page uses an HTML table to define the overall structure of the page Again, this structure could also be created using just JSF components, but for this example, an HTML table will suffice At the top of the table is the banner portion of the page that displays the main logo of the application, vtlogojpg, along with an H1-formatted banner text At runtime the H1formatted text will render with a line beneath it This is part of the style associated with H1 and is specified in the accompanying vtcss CSS file The other thing to notice is the usage of a JSF f:subview This allows for the inclusion of an external (register and login) portion of content that is used in several pages In general, JSF subviews provide a way to insert reusable portions of content using a JSP include in JSF applications
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NOTE When dealing with subviews and parameters, there are some corner cases in JSP that pose
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problems in passing parameters These problems have been solved when using technologies such as Facelets or Struts Tiles Recall that JSP includes merge Web content at runtime and are also known as dynamic includes For static includes, where the content is merged at compile time, subviews are not needed since the JSF runtime only sees the combined content Below the included portion of the page resides the main content area This is where each page will contain page-specific content As we step through building all of the pages, we ll start with this page template and fill in this area with page-specific content
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9:
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A p p l y i n g J S F : I n t r o d u c i n g t h e Vi r t u a l Tr a i n e r A p p l i c a t i o n
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Creating a Simple Authentication System
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As you ll see in 15, creating a truly secure enterprise Web application takes careful planning and coding However, it is often useful to begin with a simple authentication system that provides basic application-level authentication that can later be enhanced to a more robust architecture without completely redesigning the architecture This is the approach used by Virtual Trainer The application-based authentication employed in Virtual Trainer consists of a login form on a page (loginjsp) that obtains user credentials and then checks them against a registry of users If the user credentials do not exist in the registry, a faces invalid login message is displayed on the form and the user is not permitted to log in to the application An additional technique to aid in security is to place all secured pages in a subdirectory For example, this application places all secure pages in an /app subdirectory This facilitates either application-based or container-managed security to filter out all non-secure requests to pages residing below the secure subdirectory (Incidentally, the downloadable version of the Virtual Trainer application provides a simple example of application-based security with a Servlet filter to prevent access to the secured /app/* pages The details of how to implement a Servlet filter to secure pages is detailed in 15) The login form that receives the user-entered credentials consists of a two-column h:panelGrid component along with child components for the Userid: and Password: labels The code for the login form, which is placed in the central content area of the template page, is as follows:
<h:messages globalOnly="true" infoClass="LoginError"/> <h:panelGrid width="70%" columns="3" border="0" styleClass="form-bkg"> <h:outputLabel value="Userid:" for="userid"/> <h:inputText required="true" id="userid" binding="#{Login_Backinguserid}"/> <h:message for="userid" errorClass="ValidateError"/> <h:outputLabel value="Password:" for="password"/> <h:inputSecret required="true" id="password" binding="#{Login_Backingpassword}"/> <h:message for="password" errorClass="ValidateError"/> <f:verbatim> </f:verbatim> <h:panelGroup> <h:commandButton value="Login" action="#{Login_Backinglogin}"/> <f:verbatim>    </f:verbatim> <h:commandButton value="Cancel" immediate="true" action="welcome"/> </h:panelGroup> </h:panelGrid>
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