make barcode with vb.net PART II in Java

Paint QR in Java PART II

PART II
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Part II:
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An example of using doInTransaction( ), the addUser( ) method of UserRegistry, is shown here:
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public void addUser(final User toAdd) throws EntityAccessorException { doInTransaction(new PersistenceActionWithoutResult() { public void execute(EntityManager em) { empersist(toAdd); } }); }
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The two concrete subclasses of AbstractEntityAccessor are listed and summarized in the following table
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Class Name UserRegistry Purpose Manages create, read, and update operations on the User entity Also has some helper methods to access the TrainingSessions associated with a user Using helper methods for this purpose was a design choice An alternative would be to have a separate TrainingSessionRegistry class Manages create, read, update, and delete operations on the Event entity
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EventRegistry
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The next section explains in detail how the Virtual Trainer application is built, starting with the basic page design and culminating with advanced data operations
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A very useful approach to follow when starting a Web development project is to first design a prototype in old-fashioned HTML This approach was used for Virtual Trainer It was during this phase that a custom Cascading Style Sheet, vtcss, was also created to define a consistent look and feel for the entire application As you ll see shortly, JSF components also come pre-equipped to work well with CSS It should be noted that in addition to merely providing a look and feel for an application, CSS can also be used to specify the layout of the items on the page For the most part, however, HTML tables are still widely used to initially define a page layout Once the HTML prototype conveys the general design of the user interface, the HTML pages can then be transformed into JSF-enabled Facelet pages Facelets makes this transition exceedingly simple (Please see 4 for more about Facelets) It is also possible to continue using HTML tables for layout in your final JSF applications; however, for maximum accessibility it s generally a good practice to use JSF layout/container components Another commonly used practice during the design phase of an application is to create a single page template that all other pages will be derived from While there are many techniques and technologies for page templating, a simple and common approach is to design a single master, or parent template page, that will be used as a starting template for all other pages, thus ensuring a consistent page design and layout This is the approach that was used for the Virtual Trainer application The following is the general page design template for Virtual Trainer:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml"
10:
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
xmlns:h="http://javasuncom/jsf/html" xmlns:f="http://javasuncom/jsf/core" xmlns:c="http://javasuncom/jsp/jstl/core" xmlns:ui="http://javasuncom/jsf/facelets"> <ui:insert name="metadata"/> <f:event type="preRenderView" listener="#{loginBackingforwardToLoginIfNotLoggedIn}" /> <h:head> <title><ui:insert name="title">Virtual Trainer</ui:insert></title> <h:outputStylesheet library="style" name="vtcss" /> </h:head> <h:body>
PART II
<table width="100%" border="0"> <tr><td height="89"><h1 align="center"> <img src="#{resource['style:logojpg']}" alt="Virtual Trainer Logo" /> JSF Virtual Trainer Application</h1> </td></tr> <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> </table> <!-- WARNING: Using tables for non-tabular data violates the Web Content Accessibility Guidelines (WCAG) Do not copy this practice in your real application Use CSS instead A gem of a site for WCAG compliance is http://worksperfectlynet/wcag/ --> <table border="0"> <tr><td width="20%"> <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> </td> <td><ui:insert name="content" /></td> </tr> </table> </h:body> </html>
The preceding Facelet page is templatexhtml It exposes three spots for templated content: metadata, at the very top of the page, content at the very bottom of the page, and title, which is simply the content of the HTML <title> element The meaning of the metadata section will become clear when we describe how this application uses GET REDIRECT POST as its navigation paradigm
Part II:
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