Download e-book for iPad: Advanced JavaServer Pages by David Geary

By David Geary

ISBN-10: 0130307041

ISBN-13: 9780130307040

Hundreds of thousands of builders have found 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 searching for to deepen and enhance their services. In complicated JavaServer Pages, best-selling Java writer and previous JavaSoft developer David Geary supplies the subtle enterprise-class concepts they are looking for. Geary tackles JavaServer Pages 1.1 with a similar exhaustive, authoritative strategy that made his photograph Java books such a success. He starts off with a radical evaluation of JSP parts, servlets, and JavaBeans; then introduces customized and physique tags; and gives subtle insights into JSP-based net software layout. complex JavaServer Pages comprises designated chapters on internationalization, defense, databases, email integration, and company JavaBeans. for each Java developer attracted to growing server-side courses with JavaServer Pages and Sun's servlet applied sciences

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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. CUSTOM TAG ADVANCED CONCEPTS Topics in this Chapter • • • • • • Body Tag Handlers Iteration Scripting Variables - Storing Beans in Page Scope - Specifying Scripting Variable Information - Associating a Tag Handler and Scripting Variables - Using Custom Tag IDs Body Content - Understanding How Body Content Works - Generating JavaScript Nested Tags - Locating Ancestor Tags - Sharing Data Conclusion Sophisticated custom tags often manipulate their body content; for example, a custom tag could wrap its body content in an HTML SELECT tag, so that tag might be used like this— ...

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 most noteworthy aspect of the Form bean is that it encapsulates the code for accessing form values—including working around null values—instead of embedding that code within a JSP page. Keeping code out of JSP pages makes them more readable and easier to maintain.

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 most noteworthy aspect of the Form bean is that it encapsulates the code for accessing form values—including working around null values—instead of embedding that code within a JSP page.

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Advanced JavaServer Pages by David Geary


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