By David Geary

Middle JSTL is an in-depth exam of the JavaServer Pages general Tag Library (JSTL), which supplies a typical set of customized tags--including tags for new release, gaining access to URLs, database entry, internationalization, and the manipulation and transformation of XML documents--that online page authors and software program builders can use to increase sites. The publication illustrates JSTL's features with plenty of code snippet and examples. those examples are artistic and functional mixtures of tags you should use instantaneously! a complicated a part of the e-book covers JSTL configuration and integration of Java code with JSTL. JSTL defines an expression language that enables website improvement by way of offering an alternative choice to Java code in websites. The JSTL expression language additionally permits easy accessibility to facts similar to request parameters and attributes, cookies, and HTML headers. center JSTL examines all points of this strong new addition to the JavaServer Pages usual, and is written for web page authors and software program builders alike. JSTL is a Java typical for constructing dynamic sites. It offers non-programmers entry to robust operations via HTML-like tags.

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Unary) not ! 72.  || or = The operators are listed above from left to right and top to bottom according to precedence; for example, the [] operator has precedence over the . operator, and the modulus (% or mod ) operator, which represents a division remainder, has precedence over the logical operators. The . and [] Operators The JSTL expression language provides two operators—. and [] —that let you access scoped variables and their properties. The . operator is similar to the Java . lastName}'/> Assuming that there is a bean named name that has readable properties firstName and lastName in one of the four JSP scopes—meaning methods named getFirstName and getLastName —the preceding code fragment will display those properties.

See Chapter 3, "General-Purpose and Conditional Actions," and "Iteration Actions" on page 150 for formal discussions of the actions used throughout this chapter. 72. 1 Expression Language Overview The JSTL expression language is a simple language inspired by ECMAScript (also known as JavaScript) and XPath. The expression language provides:  Expressions and identifiers  Arithmetic, logical, and relational operators  Automatic type coercion  Access to beans, arrays, lists, and maps  Access to a set of implicit objects and servlet properties All of the features listed above are described in this chapter.

That webpage is shown in Figure 1-2. Figure 1-2. 0 release or a nightly build. I recommend that you download the former for the sake of reliability. 0 release, you can choose between ZIP and TAR files. Once you've downloaded the Reference Implementation, you can unzip or untar the file that you downloaded in a directory of your choice. Decompressing that file will produce a top-level directory, so you don't have to worry about scattering files about in the directory of your choice. Now you know how to download and install the reference implementation.

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