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javax.servlet

Sub Packages:

javax.servlet.http   The javax.servlet.http package contains a number of classes and interfaces that describe and define the contracts between a servlet class running under the HTTP protocol and the runtime environment provided for an instance of such a class by a conforming servlet container.  
javax.servlet.jsp   Classes and interfaces for the Core JSP 2.0 API.  
javax.servlet.jsp.el   Classes and interfaces for the JSP 2.0 Expression Language API.  
javax.servlet.jsp.jstl.core   Classes and interfaces related to the core tag library component of the JavaServer Pages Standard Tag Library (JSTL).  
javax.servlet.jsp.jstl.fmt   Classes and interfaces related to the locale sensitive formatting tag library component of the JavaServer Pages Standard Tag Library (JSTL).  
javax.servlet.jsp.jstl.sql   Classes and interfaces related to the sql tag library component of the JavaServer Pages Standard Tag Library (JSTL).  
javax.servlet.jsp.jstl.tlv   Reusable Tag Library Validator (TLV) classes provided by the JavaServer Pages Standard Tag Library (JSTL).  
javax.servlet.jsp.tagext   Classes and interfaces for the definition of JavaServer Pages Tag Libraries.  

Interfaces:

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.  code | html
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.  code | html
FilterConfig   A filter configuration object used by a servlet container to pass information to a filter during initialization.  code | html
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.  code | html
Servlet   Defines methods that all servlets must implement.  code | html
ServletConfig   A servlet configuration object used by a servlet container to pass information to a servlet during initialization.  code | html
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.  code | html
ServletContextAttributeListener   Implementations of this interface receive notifications of changes to the attribute list on the servlet context of a web application.  code | html
ServletContextListener   Implementations of this interface receive notifications about changes to the servlet context of the web application they are part of.  code | html
ServletRequest   Defines an object to provide client request information to a servlet.  code | html
ServletRequestAttributeListener   A ServletRequestAttributeListener can be implemented by the developer interested in being notified of request attribute changes.  code | html
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.  code | html
ServletResponse   Defines an object to assist a servlet in sending a response to the client.  code | html
SingleThreadModel   Ensures that servlets handle only one request at a time.  code | html

Abstract Classes:

GenericServlet   Defines a generic, protocol-independent servlet.  code | html
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.  code | html
ServletOutputStream   Provides an output stream for sending binary data to the client.  code | html

Classes:

ServletContextAttributeEvent   This is the event class for notifications about changes to the attributes of the servlet context of a web application.  code | html
ServletContextEvent   This is the event class for notifications about changes to the servlet context of a web application.  code | html
ServletException   Defines a general exception a servlet can throw when it encounters difficulty.  code | html
ServletRequestAttributeEvent   This is the event class for notifications of changes to the attributes of the servlet request in an application.  code | html
ServletRequestEvent   Events of this kind indicate lifecycle events for a ServletRequest.  code | html
ServletRequestWrapper   Provides a convenient implementation of the ServletRequest interface that can be subclassed by developers wishing to adapt the request to a Servlet.  code | html
ServletResponseWrapper   Provides a convenient implementation of the ServletResponse interface that can be subclassed by developers wishing to adapt the response from a Servlet.  code | html
UnavailableException   Defines an exception that a servlet or filter throws to indicate that it is permanently or temporarily unavailable.  code | html