|
What is
the servlet? |
|
Servlet is a script, which resides and
executes on server side, to create dynamic HTML. In servlet
programming we will use java language. A servlet can handle
multiple requests concurrently |
|
What is
the architechture of servlet package? |
Servlet Interface is the central
abstraction. All servlets implements this Servlet
Interface either direclty or indirectly
( may implement or extend Servlet Interfaces sub classes or sub
interfaces)
Servlet
|
Generic Servlet
|
HttpServlet ( Class ) -- we will extend this class to handle GET
/ PUT HTTP requests
|
MyServlet |
|
What is
the difference between HttpServlet and GenericServlet?
|
A GenericServlet has a service() method to
handle requests.
HttpServlet extends GenericServlet added new methods
doGet()
doPost()
doHead()
doPut()
doOptions()
doDelete()
doTrace() methods
Both these classes are abstract. |
|
What's the
difference between servlets and applets? |
|
Servlets executes on Servers. Applets
executes on browser. Unlike applets, however, servlets have no
graphical user interface. |
|
What are
the uses of Servlets? |
|
A servlet can handle multiple requests
concurrently, and can synchronize requests. Servlets can forward
requests to other servers and servlets. Thus servlets can be
used to balance load among several servers. |
|
When doGET()
method will going to execute? |
When we specified method='GET' in HTML
Example : < form name='SSS' method='GET'>
|
|
When
doPOST() method will going to execute? |
When we specified method='POST' in HTML
< form name='SSS' method='POST' >
|
|
What is
the difference between Difference between doGet() and doPost()?
|
GET Method : Using get method we can able
to pass 2K data from HTML
All data we are passing to Server will be displayed in URL
(request string).
POST Method : In this method we does not have any size
limitation.
All data passed to server will be hidden, User cannot able to
see this info
on the browser. |
|
What is
the servlet life cycle? |
When first request came in for the servlet
, Server will invoke init() method of the servlet. There after
if any user request the servlet program, Server will directly
executes the service() method. When Server want to remove the
servlet from pool, then it will execute the destroy() method
3333 |