JSP 2.0: The New Deal, Part 3
More Flexible JSP Document Format Rules
The JSP specification supports two types of JSP pages: regular JSP pages containing any type of text or markup, and JSP Documents, which are well-formed XML documents; i.e., docum
Tutorial Details:
Tag libraries are declared as XML namespaces in a JSP Document. For instance, a JSP Document with XHTML template text and JSP actions from the standard and the JSTL core libraries should have an root element with these namespace declarations:
xmlns=\"http://www.w3c.org/1999/xhtml\"
xmlns:jsp=\"http://java.sun.com/JSP/Page\"
xmlns:c=\"http://java.sun.com/jsp/jstl/core\"
xml:lang=\"en\" lang=\"en\">
The xmlns attribute sets the default namespace to the XHTML namespace, the xmlns:jsp attribute associates the jsp prefix with elements defined as JSP standard actions, and the xmlns:c attribute associates the c prefix with the elements defined by the JSTL core library.
JSP Documents have been part of the JSP specification from day one, but initially as an optional feature and later with many limitations. JSP 2.0 lifts most of these limitations, making it much easier to work with the combination of XML and JSP.
Prior to JSP 2.0, a JSP Document had to have a root element, to tell the container what type of JSP page it was. JSP 2.0 removes this limitation by defining new ways to identify a file as a JSP Document. A file is processed as a JSP Document by a JSP 2.0 container if one of these conditions is true:
1.
The request path matches the URL pattern for a web.xml JSP property group declaration with an element set to true. See part two of this series for more on JSP property group declarations.
2.
The request path extension is .jspx, unless this extension matches the URL pattern for a JSP property group declaration with an element set to false. In other words, .jspx is the default extension for JSP Documents, but it can be explicitly disabled by a property group declaration.
3.
The request path extension is either .jsp or matches a URL pattern for a JSP property group declaration and the root element in the file is .
These new rules make it possible to write a JSP Document as a regular XHTML file (with JSP elements for the dynamic content, of course), for instance, without having to place all content within a element. You can even use .html as the extension for such files if you create a JSP property group declaration like this:
...
*.html
true
...
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