visual basic 6.0 barcode generator The JavaServer Faces Framework in Java

Generating QR-Code in Java The JavaServer Faces Framework

The JavaServer Faces Framework
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javautilList; javautilMap; javautilSet; javaxfacesbeanManagedBean; javaxfacesbeanSessionScoped;
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@ManagedBean @SessionScoped public class Model { private Map<String, List<UserBean>> data; public Model() { data = new HashMap<String, List<UserBean>>(); // Populate the model with data in the constructor Naturally // in a real application, the model would be populated some // other way List<UserBean> users = new ArrayList<UserBean>(); // users with "Medium" service level usersadd(makeUser("Bob", "Biceps", "Medium", "M")); usersadd(makeUser("Frank", "Forearms", "Medium", "M")); usersadd(makeUser("Sherry", "Shins", "Medium", "F")); usersadd(makeUser("Alice", "Abs", "Medium", "F")); dataput(usersget(0)getServiceLevel(), users); users = new ArrayList<UserBean>(); // users with "Basic" service level usersadd(makeUser("Pete", "Pectorals", "Basic", "M")); usersadd(makeUser("Neil", "Neck", "Basic", "M")); usersadd(makeUser("Ellen", "Elbows", "Basic", "F")); usersadd(makeUser("Tina", "Tummy", "Basic", "F")); dataput(usersget(0)getServiceLevel(), users); users = new ArrayList<UserBean>(); // users with "Premium" service level usersadd(makeUser("Bernd", "Beine", "Premium", "M")); usersadd(makeUser("Rolf", "R ckenschmerz", "Premium", "M")); usersadd(makeUser("Bettina", "Bauch", "Premium", "F")); usersadd(makeUser("Frauke", " Fu kn chel", "Premium", "F")); dataput(usersget(0)getServiceLevel(), users); } public Set<String> getKeys() { return datakeySet(); } private UserBean makeUser(String firstName, String lastName, String serviceLevel, String sex) { UserBean result = new UserBean();
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Managed Beans and the JSF Expression Language
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resultsetFirstName(firstName); resultsetLastName(lastName); resultsetServiceLevel(serviceLevel); resultsetSex(sex); return result; } public Map<String,List<UserBean>> getData() { return data; } }
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A screen shot of the running page is shown here:
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The flash implicit object has several other features that are closely related to navigation and will be described in a more appropriate context in the chapter that deals with navigation exclusively
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Expression Operators
In addition to the [ ] and operators used in some previous examples, the EL specification defines several other useful operators These operators can be categorized into the following types: arithmetic, relational, logical, conditional, and empty Table 5-7 shows these operators Here are some EL operator examples:
<h:outputText rendered=" #{userBeanserviceLevel == 'Premium'}" value ="Congratulations, Premium members receive a #{DiscountsbasicDiscount * 10}% discount!" />
The discount example renders only for Premium members and provides them with a discount percentage ten times the basic discount value
Part I:
The JavaServer Faces Framework
Category Arithmetic Relational Logical Conditional Empty
TABLE 5-7
Operators +, -, *, / (or div), % (or mod) == (or eq ), != (or ne), < (or lt), > (or gt), <= (or le), >= (or ge) && (or and), || (or or), ! (or not) A B : C (Evaluate A to Boolean If true, evaluates and returns B Otherwise, evaluates and returns C) = empty A (If A is null or is an empty string, array, Map, or Collection, returns true Otherwise returns false)
EL Operators
To show city temperatures in both Fahrenheit and Celsius, one can use
<h:outputText value="Temperature for #{cityRegistrycityname} is: Fahrenheit: #{cityRegistrycityfahrenheitTemp} Celsius: #{(cityRegistrycityfahrenheitTemp - 32) * 5 / 9}">
Method Expressions
Method expressions are similar to value expressions, but instead of being used to retrieve and set managed bean (object) properties, method expressions are used to invoke public, non-static methods of managed beans Recall the example in 2 where a method expression was bound to a commandButton:
<h:commandButton value="Confirm" action="#{userBeanaddConfirmedUser}" />
When the Confirm button is clicked, the method addConfirmedUser( ) is invoked Method expressions use a subset syntax of value expressions where only the dot operator or bracket operator([ ]) is used to traverse the object hierarchy to access a public non-static method The other operators do not apply to method expressions
Invocation of Methods via Method Expressions
Note that the EL does not include a way to pass arguments to methods This is intentional to keep the EL as simple as possible When used from a JSP page, the arguments to the MethodExpression depend on the context in which the expression is used Table 5-8 provides the method expression details of the standard tags with the ActionSource (ActionSource2) behavioral interface It lists the arguments and return type to which the method pointed to by the MethodExpression must conform It also lists the tags and tag attributes for the MethodExpression Table 5-9 shows the standard tags/UI components with the EditableValueHolder behavioral interface and their method expression details The single tag attribute, valueChangeListener, is bound to a value change listener method, which accepts a ValueChangeEvent argument and has a return type of void
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