By David Geary
Hundreds of thousands of builders have came upon that JavaServer Pages characterize the optimum resolution for cross-platform web-based improvement. Now that they have mastered the fundamentals of JSP, many are seeking for to deepen and develop their services. In complicated JavaServer Pages, best-selling Java writer and previous JavaSoft developer David Geary supplies the subtle enterprise-class suggestions they're looking for. Geary tackles JavaServer Pages 1.1 with an identical exhaustive, authoritative procedure that made his picture Java books such a success. He starts off with an intensive evaluate of JSP components, servlets, and JavaBeans; then introduces customized and physique tags; and gives subtle insights into JSP-based net software layout. complicated JavaServer Pages comprises precise chapters on internationalization, defense, databases, e mail integration, and company JavaBeans. for each Java developer drawn to growing server-side courses with JavaServer Pages and Sun's servlet applied sciences
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Extra resources for Advanced JavaServer Pages
Java” can be used here. Specifying Scripting Variable Information JSP containers need to know a scripting variable's name, its type, whether the variable already exists or needs to be created, and the scope of the variable's lifetime. That information is encapsulated in an object—known as a tag extra info. tagext package. a. NESTED) // scope }; } } The getVariableInfo method returns an array of VariableInfo objects, each of which represents a scripting variable. a. AT_END 37 Advanced JavaServer Pages AT_BEGIN and AT_END specify scopes from the start tag or end tag, respectively, to the end of the page.
Because findAncestorWithClass returns a reference to a Tag instance, it is necessary to cast the reference to TagSupport in order to access its TagSupport functionality. One other thing: findAncestorWithClass must be passed a reference to a Class. Typically, the name of the ancestor class is known, but there's not a reference to the corresponding class available, so one has to be manufactured for the occasion. A short but handy method meant for TagSupport extensions is listed below; it that addresses all of the issues discussed above.
Storing the state of an object (in this case, a form element) in another object (a bean) is an example of the Memento design pattern. This chapter begins with a discussion of encapsulating form state in beans. Next, both client-side and server-side validation are explored, followed by an examination of a beans form framework and a custom tag that extends the HTML form tag. Forms with Beans Using beans to capture state is the preferred method for handling forms: JSP pages have easy access to beans and you can easily restore a form's values with those beans.
Advanced JavaServer Pages by David Geary