The differences between the doGet() and doPost() methods are that they are
called in the HttpServlet that your servlet extends by its service() method
when it recieves a GET or a POST request from a HTTP protocol request.
A GET request is a request to get a resource from the server. This is the
case of a browser requesting a web page. It is also possible to specify
parameters in the request, but the length of the parameters on the whole is
limited. This is the case of a form in a web page declared this way in html:
<form method="GET"> or <form>.
A POST request is a request to post (to send) form data to a resource on the
server. This is the case of a form in a web page declared this way in html:
<form method="POST">. In this case the size of the parameters can be much
greater.
The GenericServlet has a service() method that gets called when a client
request is made. This means that it gets called by both incoming requests
and the HTTP requests are given to the servlet as they are (you must do the
parsing yourself).
The HttpServlet instead has doGet() and doPost() methods that get called
when a client request is GET or POST. This means that the parsing of the
request is done by the servlet: you have the appropriate method called and
have convenience methods to read the request parameters.
NOTE: the doGet() and doPost() methods (as well as other HttpServlet
methods) are called by the service() method.
Concluding, if you must respond to GET or POST requests made by a HTTP
protocol client (usually a browser) don't hesitate to extend HttpServlet and
use its convenience methods.
If you must respond to requests made by a client that is not using the HTTP
protocol, you must use service().
-Shital
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