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  • Gary Whitten thinks this is interesting:

The tag handler is a Java class that carries out the specific behavior of the tag. It implements one of several custom tag interfaces, depending on the type of tag that you need to develop. The handler class has access to all of the JSP resources, such as the PageContext object and the request, response, and session objects. The tag also is populated with the attribute information, so it can customize its behavior based on the attribute values.

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Cover of Programming Jakarta Struts

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Custom Tags