vb.net barcode PART II in Java

Maker Data Matrix ECC200 in Java PART II

PART II
Painting Data Matrix ECC200 In Java
Using Barcode generator for Java Control to generate, create DataMatrix image in Java applications.
Decoding ECC200 In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
The first thing to notice is the messages tag that will display any global messages Notice that it has a CSS class reference to LoginError This will apply the referenced style contained in the accompanying CSS file (vtcss) when an information type message arrives, such as when an invalid login occurs The next component, h:panelGrid, serves as a layout container and is specified to have three columns This means that when rendering, the h:panelGrid component will create a new row in the table after every third child component
Barcode Printer In Java
Using Barcode generation for Java Control to generate, create bar code image in Java applications.
Bar Code Reader In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Part II:
Encoding Data Matrix 2d Barcode In Visual C#
Using Barcode maker for .NET Control to generate, create Data Matrix 2d barcode image in VS .NET applications.
Encode ECC200 In .NET
Using Barcode drawer for ASP.NET Control to generate, create ECC200 image in ASP.NET applications.
Extending JavaServer Faces
Data Matrix ECC200 Generator In VS .NET
Using Barcode printer for .NET Control to generate, create Data Matrix image in VS .NET applications.
DataMatrix Drawer In Visual Basic .NET
Using Barcode printer for .NET Control to generate, create Data Matrix ECC200 image in .NET framework applications.
As you can see, the login form is comprised of two rows of the components h:outputLabel, h:inputText (or h:inputSecret), and h:message Notice that for the password input field, an h:inputSecret component is used so as not to display any characters typed by the user Also notice each input field has a corresponding h:message component This allows the form to display field-specific validation errors styled with a custom ValidateError style, also defined in the main vtcss style sheet The Virtual Trainer Login page is shown in Figure 9-10 with validation errors If no validation errors happen, but instead an application login error occurs, the general messages component will display an invalid login error, as shown in Figure 9-11 It s important to notice that the input fields are bound to UI component instances declared in the page s backing bean using the binding attribute For example:
EAN128 Drawer In Java
Using Barcode creation for Java Control to generate, create GS1 128 image in Java applications.
Code 3/9 Printer In Java
Using Barcode generation for Java Control to generate, create USS Code 39 image in Java applications.
binding="#{Login_Backinguserid}"
GTIN - 12 Drawer In Java
Using Barcode generator for Java Control to generate, create UPCA image in Java applications.
Print Data Matrix 2d Barcode In Java
Using Barcode creation for Java Control to generate, create Data Matrix 2d barcode image in Java applications.
Recall that using the binding attribute to reference a UI component in a managed (backing) bean allows for programmatic access to the bound UI component In our case, the backing bean, Loginjava, is registered as a managed bean as Login_Backing with a scope of type request As you ll see shortly, we can extract the values from the input fields in an action method and then pass them onto an authentication method The third row of the login form simply contains an HTML non-breaking space ( ) encapsulated within a f:verbatim tag followed by a panelGroup containing both Login and Cancel h:commandButtons Inserting a space ( ) in a f:verbatim tag ensures that the login button (h:commandButton) resides in the middle column Notice also that a f:verbatim tag is also used to separate the Login and Cancel buttons a bit
2 Of 7 Code Creator In Java
Using Barcode encoder for Java Control to generate, create 2 of 7 Code image in Java applications.
EAN / UCC - 13 Creator In None
Using Barcode generation for Microsoft Excel Control to generate, create GS1-128 image in Office Excel applications.
FIGURE 9-10 The Virtual Trainer Login page with validation errors
DataMatrix Decoder In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Code 128C Generation In .NET Framework
Using Barcode generation for Reporting Service Control to generate, create Code 128 Code Set B image in Reporting Service applications.
9:
EAN-13 Drawer In C#
Using Barcode generator for VS .NET Control to generate, create EAN13 image in VS .NET applications.
Generating EAN / UCC - 13 In Objective-C
Using Barcode creator for iPhone Control to generate, create EAN 128 image in iPhone applications.
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
Create DataMatrix In None
Using Barcode generation for Excel Control to generate, create DataMatrix image in Excel applications.
Print ECC200 In .NET Framework
Using Barcode creator for Visual Studio .NET Control to generate, create Data Matrix 2d barcode image in VS .NET applications.
PART II
FIGURE 9-11 The Virtual Trainer Login page with an application login error
JSF 12 TIP The panelGrid and panelGroup were originally intended to contain only JSP tags
that were JSF components, and not plain HTML (template) text This is why the f:verbatim tag is necessary in JSF 11 The f:verbatim tag takes its nested template text and converts it into a UIOutput component, allowing the panelGrid and panelGroup components to lay it out in the expected format In JSF 12, an ease-of-use feature called content interweaving automatically converts any template text into UIOutput components so they can be laid out by components such as the panelGrid or panelGroup Notice that the action attribute of the button refers to the login action method that calls an external authentication method to determine if the entered values are valid The following is the source of the login page s backing bean
package comjsfcompreftrainerbacking; import import import import comjsfcompreftrainerUserBean; comjsfcompreftrainerUserRegistry; comjsfcompreftrainerutilUserUtil; comjsfcompreftrainerutilJSFUtil;
//Remaining import statements omitted for brevity public class Login { private HtmlInputText userid; private HtmlInputSecret password; private final static String AUTH_USER = "Authorized_User";
Part II:
Extending JavaServer Faces
public Login() { } public String login() { //Grab UserRegistry Managed Bean UserRegistry userRegCopy = (UserRegistry)JSFUtilgetManagedObject("UserRegistry"); // Call findByUserCredentials method // Retrieve currentUser which matches credentials UserBean currentUser = userRegCopyfindUserByCredentials(useridgetValue()toString(), passwordgetValue()toString()); if (currentUser == null) { // login failed FacesContextgetCurrentInstance()addMessage(null, new FacesMessage("Invalid Login!")); return "failure"; } else { // login success UserBean managedUserBean = (UserBean)JSFUtilgetManagedObject("UserBean"); UserUtilcopyUserProperties(currentUser, managedUserBean); managedUserBeansetIsLoggedIn(true); // Place authorized user token on session to satisfy security filter JSFUtilstoreOnSession(FacesContextgetCurrentInstance(), AUTH_USER, "Authorized_User"); return "success"; } } public String logout() throws IOException{ ExternalContext ectx = FacesContextgetCurrentInstance()getExternalContext(); HttpServletResponse response = (HttpServletResponse)ectxgetResponse(); HttpSession session = (HttpSession)ectxgetSession(false); sessioninvalidate(); // Navigate back to welcome page FacesContext ctx = FacesContextgetCurrentInstance(); Application app = ctxgetApplication(); appgetNavigationHandler()handleNavigation(ctx, "/welcomejsp", "welcome");
return null; } // Bean getter and setter methods omitted }
9:
Copyright © OnBarcode.com . All rights reserved.