JSP 2.0: The New Deal, Part 4
In this final part of the "JSP 2.0: The New Deal" series, we look at two new features that make it much easier to develop custom tag libraries: tag files and the new simplified tag-handler Java API.
Tutorial Details:
Developing Custom Actions as JSP Tag Files
JSP is intended to make it possible for people who are not Java gurus to write pages with dynamic content. Reusing a piece of dynamic, complex content between pages has been a bit of a pain until now. Say that you want to put a quick poll on a number of pages, with the question and answers picked up from variables. Prior to JSP 2.0, you had three options. You could copy and paste the poll form to every page where you wanted it. A better choice was to write a separate JSP page that generates the poll form, and include it in other pages with the or actions, but you could only pass it input parameters of type String, not a bean or a Map holding the answers. for instance. The third choice was to implement a custom action as a Java tag handler class, but then you'd need to know Java.
JSP 2.0 adds a fourth option: namely, developing a custom action as a tag file. A tag file is a plain text file where you use JSP elements for all dynamic parts, just as in a regular JSP page. It has the same purpose as a Java tag handler: to provide the logic for a custom action. The main differences between a tag file and a JSP page are that a tag file has a .tag filename extension, uses a tag directive instead of a page directive, and lets you declare input and output with a few new directives that are only valid in tag files.
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