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1.What is MVC?

Model-View-Controller (MVC) is a design pattern put together to help control

change. MVC decouples interface from business logic and data.

Model : he model contains the core of the application!s functionalit". he

model encapsulates the state of the application. #ometimes the onl"

functionalit" it contains is state. $t %nows nothing about the &iew or controller.

View: he &iew pro&ides the presentation of the model. $t is the loo% of the

application. he &iew can access the model getters' but it has no %nowledge

of the setters. $n addition' it %nows nothing about the controller. he &iew

should be notied when changes to the model occur.

Controller:he controller reacts to the user input. $t creates and sets the

model.

More about Model-View-Controller rchitecture **

+.What is a framewor%?

framewor% is made up of the set of classes which allow us to use a librar"

in a best possible wa" for a specic re,uirement.

.What is #truts framewor%?

#truts framewor% is an open-source framewor% for de&eloping the web

applications in a&a //' based on MVC-+ architecture. $t uses and e0tends the

a&a #er&let $. #truts is robust architecture and can be used for the

de&elopment of application of an" si2e. #truts framewor% ma%es it much

easier to design scalable' reliable Web applications with a&a.

3.What are the components of #truts?

#truts components can be categori2e into Model' View and Controller:

Model: Components li%e business logic 4business processes and data are the

part of model.

View: 5M6' # are the &iew components.

Controller: ction #er&let of #truts is part of Controller components which

wor%s as front controller to handle all the re,uests.

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7.What are the core classes of the #truts 8ramewor%?

#truts is a set of cooperating classes' ser&lets' and # tags that ma%e up a

reusable MVC + design.

a&a9eans components for managing application state and beha&ior.

/&ent-dri&en de&elopment (&ia listeners as in traditional ;$ de&elopment).

ages that represent MVC-st"le &iews< pages reference &iew roots &ia the #8

component tree.

=.What is ction#er&let?

ction#er&let is a simple ser&let which is the bac%bone of all #truts

applications. $t is the main Controller component that handles client re,uests

and determines which ction will process each recei&ed re,uest. $t ser&es as

an ction factor" > creating specic ction classes based on users re,uest.

@.What is role of ction#er&let?

ction#er&let performs the role of Controller:

rocess user re,uests

Aetermine what the user is tr"ing to achie&e according to the re,uest

ull data from the model (if necessar") to be gi&en to the appropriate &iew'

#elect the proper &iew to respond to the user

Aelegates most of this grunt wor% to ction classes

$s responsible for initiali2ation and clean-up of resources

B.What is the ction8orm?

ction8orm is a&abean which represents the form inputs containing the

re,uest parameters from the View referencing the ction bean.

D.What are the important methods of ction8orm?

he important methods of ction8orm are : &alidate() E reset().

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1F.Aescribe &alidate() and reset() methods ?

&alidate() : ;sed to &alidate properties after the" ha&e been populated