Tag Library Concepts
The toughest part of building a tag library is understanding that it's a multiple-step process. Once you understand the overall process, it's easy to concentrate on each of the individual parts needed to build a tag library.
Isolating the Business Logic
To take advantage of the object-oriented nature of Java, reusable code should be placed outside the tag library in independent class containers. These classes are not part of the tag library. Rather, they are the code implemented by the tag library to perform part of the assigned task.
That is not to say that there isn't code within a tag library that executes. There is. It's called a tag handler, and it's a Java class file. But it's specifically written in such a way that ...
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