JSTL in Action by Shawn Bayern

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By Shawn Bayern

JSTL is a crucial simplification of the Java internet platform. With JSTL, web page authors can now write dynamic pages utilizing regular HTML-like tags and an easy-to-learn expression language. JSTL is a regular from the Java neighborhood approach, and its expression language turns into a part of JSP 2.0. JSTL in motion indicates you the way to write down wealthy, dynamic web content with out programming. From easy loops to difficult XML processing, each characteristic of JSTL is roofed and exercised in different worthy examples. even if you're a amateur web page writer or an skilled Java programmer, this e-book indicates you effortless how you can create strong sites.

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Additional info for JSTL in Action

Example text

If you have three directories on your disk—a, b, and c—and you are running Windows, you can refer to these directories as follows: c:\a\b\c Note how the backslash character (\) is used to separate the directory names. Unix systems use the regular slash (/) character in a similar capacity: /a/b/c XPath adopts this Unix convention, using the slash character to separate the name of one XML element from another. info XPath variables and JSTL 147 Therefore, //p is true if it is applied to a document that has at least one

element, and it’s false if the document has no

elements.

Note that the check for Dr. appears first because it transcends gender. If we checked for a particular gender first, we would miss all the members of that gender who were also doctors. Instead, we want to check gender only if the user is not a doctor. This example demonstrates that JSTL strictly adheres to the order of your tags. If the first tag succeeds, then the second (and remaining) tags won’t be evaluated; if the second succeeds, then the third (and remaining) tags won’t be evaluated; and so on.

2 Compound conditions with Just as the core JSTL library provides , , and for complex, mutually exclusive conditionals, the XML library offers , , and for compound XML-based conditions. Their use is identical to the core library’s, except that each tag uses an XPath expression. 5 shows the attribute for . 5 tag attribute Attribute select Description XPath expression to evaluate. If true, process the tag’s body; if false, ignore the body.

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