Download Advanced JavaServer Pages by David Geary PDF

By David Geary

Millions of builders have came upon that JavaServer Pages signify the optimum resolution for cross-platform web-based improvement. Now that they have got mastered the fundamentals of JSP, many are seeking for to deepen and enhance their services. In complex JavaServer Pages, best-selling Java writer and previous JavaSoft developer David Geary provides the subtle enterprise-class concepts they are trying to find. Geary tackles JavaServer Pages 1.1 with an analogous exhaustive, authoritative technique that made his photograph Java books such a success. He starts off with a radical evaluate of JSP components, servlets, and JavaBeans; then introduces customized and physique tags; and provides refined insights into JSP-based internet software layout. complicated JavaServer Pages comprises distinctive chapters on internationalization, safety, 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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That bean is subsequently used to retrieve the name request parameter, in addition to selecting a radio button. jsp—that also uses the form bean to display the values of the textfield, text area, and the selected radio button. b. jsp at compile time. jsp would be evaluated on its own at runtime. jsp. a. = null ? = null ? equals(creditName) ? "checked" : ""; } return ""; } } The Form bean listed above has JavaBeans-compliant accessor methods that comply with the JavaBeans specification for the form's textfield (name), text area (comments), and radio buttons (credit).

The standard tag library, which will become part of a future JSP specification, will have a profound effect on JSP's usability. By providing tags for commonplace functions functionality such as iteration and database access, the standard tag library will broaden JSP's appeal. Many custom tags are simple tags with limited attributes that do not process their body content. Along with an introduction to the JSP tag package, simple tags were have been the focus of this chapter. The next chapter discusses more sophisticated aspects of custom tags, including tags that process the contents of their bodies in some fashion.

With a little more effort, custom tags can make scripting vari ables available to a JSP page. Because JSP pages can access scripting variables directly, using scripting vari ables is are preferable to accessing beans with the action. Using Custom Tag IDs Scripting variables, as opposed to beans, reduce dependences between custom tags and the JSP pages that use them, as discussed in “Scripting Variables” . But if you look closely at the example in that section, you will see that that example's JSP page has to know the name of the scripting variable that it uses—here is the pertinent code from that JSP page: 38 Advanced JavaServer Pages ...

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