Appendix B. JSP API Reference
Besides the JSP elements described in Appendix A, the JSP specification also defines a number of Java classes and interfaces. Instances of some of these classes are assigned to the implicit variables available to scripting elements in a JSP page. Others are used for development of custom actions and to allow JSP container vendors to encapsulate internal implementations. This appendix describes the classes and interfaces in all these categories.
Implicit Variables
The JSP
specification
defines a number of implicit variables. Most of the implicit
variables have types defined by classes and interfaces in the servlet
specification’s
javax.servlet.http
package, but two are part of the JSP
javax.servlet.jsp
package and one is part of the Java
core API. Scripting elements in a JSP page can use these objects to
access request and response information as well as objects saved in
one of the JSP scopes: page, request, session, and application.
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