Advanced JavaServer Pages by David Geary

March 9, 2017 | Java | By admin | 0 Comments

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 increase their services. In complex JavaServer Pages, best-selling Java writer and previous JavaSoft developer David Geary grants the subtle enterprise-class suggestions they're looking for. Geary tackles JavaServer Pages 1.1 with an analogous exhaustive, authoritative technique that made his photograph Java books such a success. He starts with a radical evaluate 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 targeted chapters on internationalization, safeguard, databases, e mail 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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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.

PopBody after the inner printBody tag's doAfterBody method has been called and before its doEndTag method is invoked. That popBody method pops the current body content off the stack, resulting in state #2 as shown in Figure 2-6. popBody between calls to the tag's doAfterBody and doEndTag methods, the body content stack is in state #3 in the inner printBody tag's doAfterBody method but is in state #2 in that tag's doEndTag method. If you are not aware of this fact, it can be difficult to manipulate body content as you would like.

The TagSupport methods are listed below: // TagSupport implements the Tag interface and adds the following // methods: protected String id; protected PageContext pageContext; static Tag findAncestorWithClass(Tag, Class) Object getValue(String key) void setValue(String key, Object value) void removeValue(String key) Enumeration getValues() String getId() void setId() TagSupport extensions have access to two protected variables: the tag's ID, and the page context. 25 Advanced JavaServer Pages The findAncestorWithClass method locates a tag's ancestor of a specified Java class.

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