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use in the faces-configxml file Using annotations is recommended over using XML because it leads to more cohesive and easier-to-maintain code
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To access properties or methods of managed beans, from your JSF pages, you will use a compact, simple-to-use expression language, which will also be explained later in this chapter For example, to display the current value of the firstName property of UserBean in a JSF page, you can use an <h:outputText> tag (UIOutput component) and set its value attribute with the following JSF expression #{userBeanfirstName}:
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<h:outputText value="#{userBeanfirstName}" />
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JSF 20 TIP Because JSF 20 includes Facelets, it is also possible to put EL Expressions directly in
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the page, instead of using an <h:outputText> tag This is useful when there is no need to attach attributes, such as CSS or JavaScript to the <h:outputText> For example, the preceding tag could simply be replaced by #{userBeanfirstName} straight in the page
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At runtime, the JSF expression allows the value of the firstName property to be displayed in the page As we ll show later in the chapter, the JSF expression language allows for a shorthand way to call the getFirstName( ) method of UserBean and display its value in the page using the <h:outputText> tag Recall that in addition to displaying the current properties of a managed bean, properties can also be updated if the managed bean has setter methods for those properties To update properties of a managed bean, you can bind a property of the bean to a UI component that accepts an input value (implements EditableValueHolder) such as UIInput Recall again the registration form used the UIInput component (with the JSP tag <h:inputText>) with its value attribute set with a JSF expression to accept the registrant s input values
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<h:inputText value="#{userBeanfirstName}" />
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Part I:
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The JavaServer Faces Framework
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In general, during a form submission, the JSF request processing lifecycle updates managed bean properties with new property values from UIInput components In this example, the form submission causes the setFirstName( ) method on UserBean to be called The argument to the method is the value entered into the text field by the user Table 5-1 shows the basic elements used in a managed bean registration
Initializing Managed Bean Properties
So far you have seen how to register a simple managed bean and relied on a JSF application to display or update bean properties However, it is also possible to supply initial values to managed beans by adding a @ManagedProperty annotation on a field or by providing a <managed-property> element inside the managed-bean entry in the Faces configuration file For example, to initialize the firstName and lastName properties of the userBean managed bean, you can add the following to the annotation declarations:
@ManagedBean @SessionScoped public class UserBean { @ManagedProperty(value="Jane") private String firstName; @ManagedProperty(value="Doe") private String lastName; public String getFirstName() { return firstName; } public void setFirstName(String firstName) {thisfirstName = firstName;} public String getLastName() { return lastName; } public void setLastName(String lastName) {thislastName = lastName;} }
or the following to the configuration:
<managed-bean> <managed-bean-name>userBean</managed-bean-name> <managed-bean-class>comjsfcomprefregisterUserBean</managed-bean-class> <managed-bean-scope>session</managed-bean-scope> <managed-property> <property-name>firstName</property-name> <value>Jane</value> </managed-property> <managed-property> <property-name>lastName</property-name> <value>Doe</value> </managed-property> </managed-bean>
This has the effect of executing the setter methods for the firstName and lastName properties just after the bean is instantiated by the Faces lifecycle Note that in both the XML and the annotation syntax, the getter and setter methods are required At runtime the registration form in the registerxhtml page would no longer appear completely empty
5:
Managed Beans and the JSF Expression Language
Element <managed-bean>
Description Parent element of a managed bean in the Faces configuration file Description of the purpose of the managed bean (Optional) A display name of the managed bean Intended for possible development tool usage (Optional) Icon associated with this managed bean Also intended for development tool usage (Optional) The published name of the managed bean JSF expression language uses this name
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