Servlet API is necessary for defining classes and interfaces while developing web based applications. There are two packages in servlet program.
- servlet
- servlet.http
Javax.servlet
Javax.servlet package has a list of interfaces and classes to use with the servlet or web containers and they are not specific to any protocol.
Javax.servlet.http
Classes and interfaces lists are managed by Javax.servlet.http and used to define http servlet programs. This package is only used to handle http request and other http protocols.
Interfaces in javax.servlet package
- Servlet
- ServletRequest
- ServletResponse
- RequestDispatcher
- ServletConfig
- ServletContext
- SingleThreadModel
- Filter
- FilterConfig
- FilterChain
- ServletRequestListener
- ServletRequestAttributeListener
- ServletContextListener
- ServletContextAttributeListener
Classes in javax.servlet package
- GenericServlet
- ServletInputStream
- ServletOutputStream
- ServletRequestWrapper
- ServletResponseWrapper
- ServletRequestEvent
- ServletContextEvent
- ServletRequestAttributeEvent
- ServletContextAttributeEvent
- ServletException
- UnavailableException
Interfaces in javax.servlet.http package
- HttpServletRequest
- HttpServletResponse
- HttpSession
- HttpSessionListener
- HttpSessionAttributeListener
- HttpSessionBindingListener
- HttpSessionActivationListener
- HttpSessionContext (deprecated now)
Classes in javax.servlet.http package
- HttpServlet
- Cookie
- HttpServletRequestWrapper
- HttpServletResponseWrapper
- HttpSessionEvent
- HttpSessionBindingEvent
- HttpUtils (deprecated now)
