qr code programmieren java NOTE Further coverage of managed beans and scope settings is provided in 5 in Java

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NOTE Further coverage of managed beans and scope settings is provided in 5
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The JavaServer Faces Framework
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Now that we ve shown how to register a Java class as a managed bean, let s take a look at the actual managed bean, UserBeanjava, which is used in this example application:
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package comjsfcomprefmodel; import import import import import import import javautilDate; javaxfacesapplicationFacesMessage; javaxfacescomponentUIComponent; javaxfacescontextFacesContext; javaxfacesbeanManagedBean; javaxfacesbeanSessionScoped; javaxfacesvalidatorValidatorException;
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@ManagedBean @SessionScoped public class UserBean { protected protected protected protected protected protected String firstName; String lastName; Date dob; String sex; String email; String serviceLevel = "medium";
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public String getFirstName() { return firstName; } public void setFirstName(String firstName) { thisfirstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { thislastName = lastName; } public Date getDob() { return dob; } public void setDob(Date dob) { thisdob = dob; } public String getSex() { return sex; } public void setSex(String sex) { thissex = sex; }
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Building a Simple JavaServer Faces Application
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public String getEmail() { return email; }
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PARTIII PART PART
public void setEmail(String email) { thisemail = email; } public String getServiceLevel() { return serviceLevel; } public void setServiceLevel(String serviceLevel) { thisserviceLevel = serviceLevel; } public void validateEmail(FacesContext context, UIComponent toValidate, Object value) throws ValidatorException { String emailStr = (String) value; if (-1 == emailStrindexOf("@")) { FacesMessage message = new FacesMessage("Invalid email address"); throw new ValidatorException(message); } } public String addConfirmedUser() { boolean added = true; // actual application may fail to add user FacesMessage doneMessage = null; String outcome = null; if (added) { doneMessage = new FacesMessage("Successfully added new user"); outcome = "done"; } else { doneMessage = new FacesMessage("Failed to add new user"); outcome = "register"; } FacesContextgetCurrentInstance()addMessage(null, doneMessage); return outcome; } }
As you can see, the UserBean Java class is a straightforward Java bean with various fields firstName, lastName, sex, dob (Date of Birth), and serviceLevel all of which are of type String except dob, which is of type Date Notice also the getters and setters for each field as well Each of these fields is represented in the registerxhtml registration form with corresponding JSF UI components, which are value bound to the bean properties You ll also notice the extra methods: validateEmail( ) and addConfirmedUser( ) These are custom methods that essentially do exactly what their name indicates These methods are also bound to the UI components in the page You will see how shortly Now that we ve reviewed what managed beans are, as well as how to configure them and access their properties, let s get back to the registerxhtml page As you continue
Part I:
The JavaServer Faces Framework
browsing the rest of the page, you see a radio button UI component that is actually made from a combination of tags:
<h:selectOneRadio id="sex" value="#{userBeansex}" required="true"/> <f:selectItem itemLabel="Male" itemValue="male"/> <f:selectItem itemLabel="Female" itemValue="female"/> </h:selectOneRadio> <h:message for="sex"/>
The main parent tag, <h:selectOneRadio>, is the one that is value-bound to the userBean s gender property via the JavaBeans getter and setter This means that whatever value is selected in the radio button control, it will be updated in the gender property of the managed bean when the form is submitted For the individual select choices, the child tags <f:selectItem> provide both a displayed value or itemLabel along with an actual itemValue, which is the actual value used when a selection occurs As before, a selection is required and if left blank, an error message will appear via the <h:message> tag Moving on to the next input field, you see the following code:
<h:inputText value="#{userBeandob}" id="dob" required="true" > <f:convertDateTime pattern="MM-dd-yy"/> </h:inputText> (mm-dd-yy) <h:message for="dob"/>
As before, this input field is required, but this time instead of being bound to a bean property that is a String, this inputText component is bound to the userBeandob property that is of type javautilDate In order to translate the incoming string value into the serverside Date type, a JSF converter is used with the tag <f:convertDateTime> Notice the pattern attribute of the Converter tag also defines the expected date format pattern of MM-dd-yy
NOTE To JSF, the uppercase MM actually means month and mm means minutes However,
most end users wouldn t necessarily know this, so the date pattern prompt is left intentionally in lowercase (mm-dd-yy)
When the user enters a date string following the specified format, the Converter will convert it to a Date object and assign it to the userBeandob property However, if an incorrect date format pattern is used, a conversion error will be displayed To see what occurs when improper information is entered and submitted in the registration form, Figure 2-4 contains a screenshot of the registration page with various validation and converter error messages shown Notice the Email Address error message is shown when foo is entered This is because the associated validation method validateEmail( ) in the UserBean managed bean is not accepting the foo string as a valid e-mail address:
<h:inputText id="email" value="#{UserBeanemail}" required="true" validator="#{UserBeanvalidateEmail}"/> <h:message for="email"/>
This is actually the simplest form of custom validation in JavaServer Faces Another method for creating custom validation can be achieved by creating a separate Validator
2:
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