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The syntax of the element depends on the source of the property value Table 12 1 summarizes the various ways to set a property of a JavaBeans component using the element Table 12 1 Setting JavaBeans Component Properties
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A property set from a constant string or request parameter must have a type listed in Table 12 2 Since both a constant and request parameter are strings, the Web container automatically converts the value to the property s type; the convalues can be used to assign values version applied is shown in the table to a property that has a class When that is the case, the method is used A conversion failure arises if the method throws
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JAVABEANS COMPONENTS IN JSP PAGES
an The value assigned to an indexed property must be an array, and the rules just described apply to the elements Table 12 2 Valid Value Assignments
Property Type
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You would use a runtime expression to set the value of a property whose type is a compound Java programming language type Recall from the section Expressions, page (262) that a JSP expression is used to insert the value of a scripting language expression, converted into a , into the stream returned to the client When used within a element, an expression simply returns its value; no automatic conversion is performed As a consequence, the type returned from an expression must match or be castable to the type of the property The Duke s Bookstore application demonstrates how to use the element and a scriptlet to set the current book for the database helper bean For example, uses the form
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The following fragments from the page illustrate how to initialize a currency bean with a object and amount determined by evaluating request-time expressions Because the first initialization is nested in a element, it is only executed when the bean is created
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There are several ways to retrieve JavaBeans component properties Two of the methods (the element and an expression) convert the value of the property into a and insert the value into the current implicit object:
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If you need to retrieve the value of a property without converting it and inserting it into the object, you must use a scriptlet: