Package javax.servlet
This chapter describes the javax.servlet package.
See:
Description
Interface Summary
Filter
A filter is an object that performs filtering tasks
on either the request to a resource (a servlet or static content), or on the response from
a resource, or both.
Filters perform filtering in the
doFilter method.
FilterChain
A FilterChain is an object provided by the servlet container to the developer
giving a view into the invocation chain of a filtered request for a resource.
FilterConfig
A filter configuration object used by a servlet container
to pass information to a filter during initialization.
RequestDispatcher
Defines an object that receives requests from the client
and sends them to any resource (such as a servlet,
HTML file, or JSP file) on the server.
Servlet
Defines methods that all servlets must implement.
ServletConfig
A servlet configuration object used by a servlet container
to pass information to a servlet during initialization.
ServletContext
Defines a set of methods that a servlet uses to communicate with its
servlet container, for example, to get the MIME type of a file, dispatch
requests, or write to a log file.
ServletContextAttributeListener
Implementations of this interface receive notifications of
changes to the attribute list on the servlet context of a web application.
ServletContextListener
Implementations of this interface receive notifications about changes to the servlet context of the web application they are part of.
ServletRequest
Defines an object to provide client request information to a servlet.
ServletRequestAttributeListener
A ServletRequestAttributeListener can be implemented by the
developer interested in being notified of request attribute
changes.
ServletRequestListener
A ServletRequestListener can be implemented by the developer
interested in being notified of requests coming in and out of
scope in a web component.
ServletResponse
Defines an object to assist a servlet in sending a response to the client.
SingleThreadModel
Deprecated. As of Java Servlet API 2.4, with no direct
replacement.
Class Summary
ServletContextAttributeEvent
This is the event class for notifications about changes to the attributes of the
servlet context of a web application.
ServletContextEvent
This is the event class for notifications about changes to the servlet context of a web application.
ServletInputStream
Provides an input stream for reading binary data from a client
request, including an efficient
readLine method
for reading data one line at a time.
ServletRequestWrapper
Provides a convenient implementation of the ServletRequest interface that
can be subclassed by developers wishing to adapt the request to a Servlet.
ServletResponseWrapper
Provides a convenient implementation of the ServletResponse interface that
can be subclassed by developers wishing to adapt the response from a Servlet.
Exception Summary
ServletException
Defines a general exception a servlet can throw when it
encounters difficulty.
UnavailableException
Defines an exception that a servlet or filter throws to indicate
that it is permanently or temporarily unavailable.
Package javax.servlet Description
This chapter describes the javax.servlet package. The chapter includes content that is generated automatically from javadoc embedded in the actual Java classes and interfaces. This allows the creation of a single, authoritative, specification document.
Generic Servlet Interfaces and Classes
The
javax.servlet package
contains a number of classes and interfaces that describe and define the contracts between a servlet class and the runtime environment provided for an instance of such a class by a conforming servlet container.
The
Servlet
interface is the central abstraction of the servlet API. All servlets implement this interface either directly, or more commonly, by extending a class that implements the interface. The two classes in the servlet API that implement the
Servlet
interface are
GenericServlet
and
HttpServlet
. For most purposes, developers will extend
HttpServlet
to implement their servlets while implementing web applications employing the HTTP protocol.
The basic
Servlet
interface defines a
service
method for handling client requests. This method is called for each request that the servlet container routes to an instance of a servlet.
The javax.servlet package
The following section summarizes the javax.servlet package: