What is MVC Architecture?
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Answer Posted / soumen swarnakar
The main aim of the MVC architecture is to separate the
business logic and application data from the presentation
data to the user.
Here are the reasons why we should use the MVC design
pattern.
They are resuable : When the problems recurs, there is no
need to invent a new solution, we just have to follow the
pattern and adapt it as necessary.
They are expressive: By using the MVC design pattern our
application becomes more expressive.
1). Model: The model object knows about all the data that
need to be displayed. It is model who is aware about all
the operations that can be applied to transform that
object. It only represents the data of an application. The
model represents enterprise data and the business rules
that govern access to and updates of this data. Model is
not aware about the presentation data and how that data
will be displayed to the browser.
2). View : The view represents the presentation of the
application. The view object refers to the model. It uses
the query methods of the model to obtain the contents and
renders it. The view is not dependent on the application
logic. It remains same if there is any modification in the
business logic. In other words, we can say that it is the
responsibility of the of the view's to maintain the
consistency in its presentation when the model changes.
3). Controller: Whenever the user sends a request for
something then it always go through the controller. The
controller is responsible for intercepting the requests
from view and passes it to the model for the appropriate
action. After the action has been taken on the data, the
controller is responsible for directing the appropriate
view to the user. In GUIs, the views and the controllers
often work very closely together.
Difference between Model 1 and Model 2 architecture:
Features of MVC1:
Html or jsp files are used to code the presentation. To
retrieve the data JavaBean can be used.
In mvc1 archictecture all the view, control elements are
implemented using Servlets or Jsp.
In MVC1 there is tight coupling between page and model as
data access is usually done using Custom tag or through
java bean call.
Features of MVC2:
The MVC2 architecture removes the page centric property of
MVC1 architecture by separating Presentation, control logic
and the application state.
In MVC2 architecture there is only one controller which
receives all the request for the application and is
responsible for taking appropriate action in response to
each request.
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