STRUTS
The
model contains the business logic and interact with the persistance
storage to store, retrive and manipulate data.
The view is responsible for dispalying the results back to the
user. In Struts the view layer is implemented using JSP.
The controller handles all the request from the user and selects
the appropriate view to return. In Sruts the controller's job
is done by the ActionServlet.
• The
ActionServlet receives the request.
• The
struts-config.xml file contains the details regarding the Actions,ActionForms,
ActionMappings
and ActionForwards.
• During
the startup the ActionServelet reads the struts-config.xml file
and creates a database
of configuration objects. Later while processing the request the
ActionServlet makes
decision by refering to this object.
When
the ActionServlet receives the request it does the following tasks.
• Bundles
all the request values into a JavaBean class which extends Struts
ActionForm class.
• Decides
which action class to invoke to process the request
• Validate
the data entered by the user.
• The
action class process the request with the help of the model component.The
model interacts
with the database and process the request.
• After
completing the request processing the Action class returns an
ActionForward to the controller.
• Based
on the ActionForward the controller will invoke the appropriate
view.
• The
HTTP response is rendered back to the user by the view component.
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