make barcode with vb.net Extending JavaServer Faces in Java

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Extending JavaServer Faces
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After the metadata insertion, we have <f:event type="preRenderView" listener="#{loginBackingforwardToLoginIfNotLoggedIn"> The <f:event> element is described in detail in 9 In this case, the <f:event> element forces a call to the method forwardToLoginIfNotLoggedIn( ) on class LoginBacking before the page is rendered This method ensures that the only pages that can be shown without the user being logged in are loginxhtml and registerxhtml The code for this method is shown here:
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public void forwardToLoginIfNotLoggedIn(ComponentSystemEvent cse) { String viewId = getFacesContext()getViewRoot()getViewId(); if (!isUserLoggedIn() && !viewIdstartsWith("/login") && !viewIdstartsWith("/register")) { getFacesContext()getApplication()getNavigationHandler() handleNavigation(getFacesContext(), null, "/login faces-redirect=true"); } }
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This method is essentially a single if statement that says, if the user is not already logged in, and we re not already on the login or registration pages, then redirect to the login page Note the use of implicit navigation here This feature is described in detail in 6 The preRender event is used in a very similar fashion on all pages that should only be viewable by users who are trainers For example, the addTrainingEventxhtml page has this code near the top: <f:event type="preRenderView" listener="#{editTrainingEventBacking forwardToMainIfNotTrainer}" /> The code behind this method is shown here:
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public void forwardToMainIfNotTrainer(ComponentSystemEvent cse) { User user; if (null != (user = getCurrentUser()) && !userisTrainer()) { getFacesContext()getApplication()getNavigationHandler() handleNavigation(getFacesContext(), null, "/user/allEvents faces-redirect=true"); } }
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Continuing through templatexhtml, we come to the <h:head> section This section has a <ui:insert> for the title, with a default value of Virtual Trainer, and it includes a stylesheet using <h:outputStylesheet library="style" name="vtcss" /> This is an example of a usage of a resource library Following the head is a table that spans the width of the page This table provides a common page header for application pages Within this header, this same resource is used to render the logo image using the EL syntax for referring to resources: <img src="# {resource['style:logojpg']}" alt="Virtual Trainer Logo" /> Also in the header, if the user is logged in, we provide a button to allow that user to log out using the following code:
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<c:if test="#{loginBackinguserLoggedIn}"> <tr><td align="right"><h:form> Logged in as #{sessionScopecurrentUseruserid}, <h:commandButton value="Logout" action="#{loginBackingperformLogout}" /> </h:form></td></tr> </c:if>
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10:
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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 V i 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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Beneath the header we have another table, with a single row The first column contains a very simple navigation bar populated with <h:link> elements pointing to various places within the application The second column is simply <ui:insert name="content" /> Let s take a closer look at the navigation bar
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<c:if test="#{loginBackinguserLoggedIn}"> <h3>Navigation Bar</h3> <c:if test="#{loginBackingcurrentUsertrainer}"> <h:link outcome="/trainer/addTrainingEvent">Add Training Event</h: link><br/> <h:link outcome="/trainer/viewTrainees">Monitor Trainee Progress</h: link><br/> </c:if> <h:link outcome="/user/editUser">My Profile</h:link> <br /> <h:link outcome="/user/allEvents">All Events</h:link> <br /> <c:if test="#{!loginBackingcurrentUsertrainer}"> <h:link outcome="/user/myEvents">My Events</h:link> <br /> </c:if> </c:if>
PART II
First, note that the navigation bar isn t even shown unless the user is logged in This is necessary because the login page itself uses the templatexhtml and we certainly don t want to show the links to a user who is not logged in Second, note that some of the links are displayed only if the user is a trainer, using <c:if test="#{loginBackingcurrentUsertrainer}">, and in similar fashion the myEvents link is not shown if the user is a trainer Finally, note the values of the outcome attributes This is an example of implicit navigation, described in detail in 6 Another important thing to note about navigation in Virtual Trainer is the near complete use of the POST REDIRECT GET pattern This pattern, and its desirable properties, are also described in 6 The following section describes the mechanics of how login and logout work
Creating a Simple Authentication System
As you ll see in 14, 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 (loginxhtml) 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 Virtual Trainer uses a new feature in JSF 20, Composite Components, to encapsulate the login panel into a reusable component This approach, combined with the use of Facelets, makes the login page extremely simple:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml"
Part II:
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