Appendix A. Servlet API Quick Reference
The javax.servlet package is the core of the
Servlet API. It includes the basic
Servlet interface, which all servlets must
implement in one form or another, and an abstract
GenericServlet class for developing basic
servlets. It also includes classes for communicating with the host
server and client (ServletRequest and
ServletResponse) and communicating with the client
(ServletInputStream and
ServletOutputStream). The class hierarchy of the
javax.servlet package is shown in Figure A-1. Servlets should confine themselves to the
classes in this package in situations in which the underlying
protocol is unknown.
Figure A-1. The java.servlet package
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