C o n v e r t i n g a n d Va l i d a t i n g D a t a in Java

Generation QR Code in Java C o n v e r t i n g a n d Va l i d a t i n g D a t a

C o n v e r t i n g a n d Va l i d a t i n g D a t a
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E XPERT GROUP I NSIGHT In all of the preceding cases, we have glossed over how the content of the
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FacesMessage is localized for messages that are built into the specification The EG intentionally avoided providing a factory API for FacesMessage instances because a generic factory pattern may be included in a future release of the Java platform, and it would be preferable to use that when it is available Instead of the factory, the EG specified the exact manner in which the Java platform s ResourceBundle mechanism must be used to create and populate a FacesMessage instance with its localized message content The following is the algorithm: 1 Call the getMessageBundle( ) method on the application This returns the fully qualified name of the ResourceBundle to be used for this application, or null if no such bundle has been set If null, use javaxfacesMessages as the name of the ResourceBundle 2 Use the Java platform ResourceBundle lookup methods, and the Locale from the current UIViewRoot to obtain the ResourceBundle named from Step 1 3 Look in the ResourceBundle for a value under the key given by the value of the messageId for this FacesMessage If none is found, there is no localized content for this message Otherwise, use the value as the summary property of the FacesMessage Append the string _detail to the messageId and look in the ResourceBundle for a value under that key If one is found, use the value as the detail of the FacesMessage 4 Make sure to perform any parameter substitution required on the localized content for example, if the returned ResourceBundle is Validation Error: Specified attribute is not between the expected values of {0} and {1}, the proper values must be substituted for {0} and {1}, perhaps using javatextMessageFormat
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PARTIII PART PART
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At long last we have come to the place where the users enter the picture: showing them the errors in their input and how to correct them In keeping with the JSF component model, there are two standard components that serve as placeholders in the view for messages to appear: UIMessage and UIMessages Along with these components, there are renderers in the standard HTML render-kit: javaxfacesMessage and javaxfacesMessages, respectively Naturally, to show the valid combinations of these components and renderers, there are the <h:message> and <h:messages> tags in the html_basic tag library As with all of the components in the standard HTML component set, the heavy lifting is done by the renderers, so we ll briefly describe those in this section We then list the standard message keys for converters and validators, and show how to customize messages and add new ones The <h:message> tag places into the view a UIMessage component associated with a javaxfacesMessage renderer Whenever the user places a <h:message> tag in the page, the user is required to provide a for attribute that gives the componentId of the component for which this tag will display messages This gives the page author complete freedom to display the messages however he or she likes in the page Beginning in JSF12, a dir attribute has been included that lets the page author give a cue to the Renderer about the direction of the text, either left to right (LTR) or right to left (RTL) This Renderer gets an Iterator of messages from the FacesContext by calling its getMessages( ) method, and passing the value of the for attribute Only the first message in the Iterator is rendered (See 16 for complete information on <h:message>)
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Part I:
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The <h:messages> tag places into the view a UIMessages component associated with a javaxfacesMessages renderer Whenever the user places a <h:messages> tag, all messages in the FacesContext are displayed, unless the globalOnly attribute is set, in which case only messages that are not associated with a given component are displayed The layout attribute can be either table or list If table, the messages are displayed in an HTML table; if list, they are displayed in an HTML unordered list (Again, see 16 for complete information on <h:message>)
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