visual basic 6.0 barcode generator The JavaServer Faces Framework in Java

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The JavaServer Faces Framework
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Finally, here is the very simple JavaBean that is the model managed bean:
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package comjsfcompref; import javaxfacesbeanManagedBean; import javaxfacesbeanRequestScoped; @ManagedBean @RequestScoped public class Model { protected String firstName; public String getFirstName() { return firstName; } public void setFirstName(String firstName) { thisfirstName = firstName; } }
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Because Model has been given the @RequestScoped annotation, its values will not persist across multiple invocations of the JSF request processing lifecycle Recall that the XHTML markup for the first button is <h:button value="HTTP GET" outcome="page02" /> Pressing this button will cause the following rendering of page02xhtml to appear:
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Note that the value of the modelfirstName property is the empty string This is because the h:button command does not, by default, submit any form values, so whatever is entered into the text field is lost Returning to the first page and filling in a value for text field and pressing the second button will give us the same result, even though this time the button is coded with <h:commandButton value="HTTP POST with Redirect" action="page02 facesredirect=true" /> We are, indeed, doing a POST, and the value entered into the text field is submitted, but because the action attribute includes faces-redirect=true, the implicit navigation will behave as if a <redirect /> element was in play Therefore, when the postback happens, and the navigation action is processed, the server tells the browser to make another
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The Navigation Model
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HTTP request to the new URL Because the model Managed Bean is @RequestScoped, the value submitted on the first request is not retained when the server renders the page as a result of the second request The result is the same as shown previously Now, returning a third time to the initial page, we once again enter a value into the text field and this time press the HTTP POST button Finally, we get the expected result, as shown here
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PARTIII PART PART
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POST REDIRECT GET and JSF
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Michael Jouravlev, in his influential August 2004 article on theserversidecom, describes the POST REDIRECT GET (PRG) pattern as follows: Never show pages in response to POST Always load pages using GET Navigate from POST to GET using REDIRECT We have seen that JSF violates the first of these rules by using POST for every page navigation via the RequestDispatcherforward( ) method from the Servlet API Indeed, most popular Java Servlet based Web frameworks, including Struts, use this approach for navigation HTTP purists rightly point out that this approach violates the first rule in the PRG pattern Not only did JSF violate the first rule, but until JSF 20, it was very difficult to do it any other way Thanks to another JSF contribution from the Seam team at JBoss, it is now much easier to do PRG with JSF Let s rewrite the registration example from 2 using PRG We ll do it two different ways, using the flash, and then using View Parameters
POST REDIRECT GET Using the Flash Let s revisit the registerxhtml page, this time using the
flash The changed elements are shown in boldface
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml" xmlns:h="http://javasuncom/jsf/html" xmlns:f="http://javasuncom/jsf/core"> <h:head> <title>A Simple JavaServer Faces Registration Application</title> </h:head>
Part I:
The JavaServer Faces Framework
<h:body> <h:form> <h2>JSF Registration App</h2> <h4>Registration Form</h4> <table> <tr> <td>First Name:</td> <td> <h:inputText label="First Name" id="fname" value="#{flashfirstName}" required="true"/> <h:message for="fname" /> </td> </tr> <tr> <td>Last Name:</td> <td> <h:inputText label="Last Name" id="lname" value="#{flashlastName}" required="true"/> <h:message for="lname" /> </td> </tr> additional table rows not shown </table> <p><h:commandButton value="Register" action="confirm faces-redirect=true" /></p> </h:form> </h:body> </html>
The only changes necessary to the page to support PRG using the flash are: 1) change the EL expressions for the components to store their values into properties in the flash rather than on the UserBean, and 2) add the faces-redirect special query parameter to the implicit navigation to the confirmxhtml page Let s look at the confirmxhtml page
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml" xmlns:h="http://javasuncom/jsf/html" xmlns:f="http://javasuncom/jsf/core"> <h:head> <title>A Simple JavaServer Faces Registration Application</title> </h:head> <h:body> <h:form> <h2>JSF Registration App</h2> <h4>Registration Confirmation</h4> <table> <tr> <td>First Name:</td> <td> <h:outputText value="#{flashkeepfirstName}" /> </td> </tr>
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