Read e-book online Advanced JavaServer Pages PDF

By David Geary

ISBN-10: 0130307041

ISBN-13: 9780130307040

Hundreds of thousands of builders have came upon that JavaServer Pages characterize the optimum answer for cross-platform web-based improvement. Now that they have mastered the fundamentals of JSP, many are searching for to deepen and boost their services. In complex JavaServer Pages, best-selling Java writer and previous JavaSoft developer David Geary can provide the delicate enterprise-class suggestions they are looking for. Geary tackles JavaServer Pages 1.1 with an analogous exhaustive, authoritative strategy that made his photo 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 provides subtle insights into JSP-based net software layout. complex JavaServer Pages contains targeted chapters on internationalization, protection, databases, email integration, and company JavaBeans. for each Java developer attracted to developing server-side courses with JavaServer Pages and Sun's servlet applied sciences

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The left picture in Figure 3-1 shows the page after the form has been filled out but before it has been submitted. The right picture shows the page after the form has been submitted. 54 Advanced JavaServer Pages Figure 3-1. Saving Form Values in a Bean When the form in Figure 3-1 is redisplayed, the form's elements retain their values with state stored in a bean. a. Form is created and stored in request scope. The jsp:setProperty action sets the bean's properties according to the request parameters.

The third group of TagSupport methods listed above provide access to a tag's values, which are key/value pairs where the key is a string and the value can be any object. JSP Tip Most Custom Tags Extend TagSupport or BodyTagSupport The TagSupport and BodyTagSupport classes provide enough basic functional ity that they are almost always extended instead of implementing the Tag and BodyTag interfaces directly. Because Java does not support multiple inheritance, existing classes don't have the option to extend TagSupport or BodyTagSupport.

A, which uses an iterate tag that makes the current item in a collection available as a scripting variable. a is exactly the same as that shown in Figure 2-1 ; therefore, that figure is not repeated here . a , you can see that scripting variables eliminate the need for , which results in two benefits: the JSP code is simpler and the bean's scope does not need to be specified. a, using scripting variables is straightforward. Implementing a custom tag that creates scripting variables is a three-step process: 1.

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Advanced JavaServer Pages by David Geary


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