By David Geary

ISBN-10: 0130307041

ISBN-13: 9780130307040

Hundreds of thousands of builders have stumbled on that JavaServer Pages signify the optimum resolution for cross-platform web-based improvement. Now that they have mastered the fundamentals of JSP, many are searching for to deepen and enhance their services. In complex JavaServer Pages, best-selling Java writer and previous JavaSoft developer David Geary grants the delicate enterprise-class suggestions they're looking for. Geary tackles JavaServer Pages 1.1 with a similar exhaustive, authoritative process that made his photograph Java books such a success. He starts off with an intensive overview of JSP parts, servlets, and JavaBeans; then introduces customized and physique tags; and gives refined insights into JSP-based internet software layout. complex JavaServer Pages comprises designated chapters on internationalization, protection, databases, electronic mail integration, and firm JavaBeans. for each Java developer drawn to growing server-side courses with JavaServer Pages and Sun's servlet applied sciences

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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. 28 Advanced JavaServer Pages Chapter 2.

Table 2-1 lists the valid return values for BodyTag methods that influence flow of control. Table 2-1. BodyTag Method Return Values Method Valid Return Values doStartTag() EVAL_BODY_TAG: evaluate body content and store the result in a BodyContent object SKIP_BODY: do not evaluate body doAfterTag() EVAL_BODY_TAG: reevaluate body content SKIP_BODY: do not reevaluate body content doEndTag() EVAL_PAGE: process the page after the end tag SKIP_PAGE: do not process the page beyond the end tag The BodyTagSupport Class Nearly all body tag handlers extend the BodyTagSupport class—an implementation of BodyTag—instead of directly implementing the BodyTag interface.

Jsp; see “Security” for more information concerning login and security in general. 27 Advanced JavaServer Pages If the user's role is 'user', doStartTag returns EVAL_BODY_INCLUDE, and the body of the tag is included. If the user's role is not 'user', the method returns SKIP_BODY and the body content is ignored. JSP Tip Including Body Content Custom tags that do not implement the BodyTag interface can pass through body content unchanged by returning EVAL_BODY_INCLUDE from doStart Tag. If tags need to manipulate the content of their bodies, they must implement the BodyTag interface, as discussed in “Body Tag Handlers”.

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Advanced JavaServer Pages by David Geary


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