||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.
||Defines methods that all servlets must implement.
||A servlet configuration object used by a servlet container
used to pass information to a servlet during initialization.
||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.
||Defines an object to provide client request information to a servlet.
||Defines an object to assist a servlet in sending a response to the client.
||Ensures that servlets handle
only one request at a time.