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Q:
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A:
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The
core of the Struts framework is a flexible control layer based on standard
technologies like Java Servlets, JavaBeans, ResourceBundles, and XML, as well
as various Jakarta Commons packages. Struts encourages application
architectures based on the Model 2 approach, a variation of the classic
Model-View-Controller (MVC) design paradigm.
Struts
provides its own Controller component and integrates with other technologies
to provide the Model and the View. For the Model, Struts can interact with
standard data access technologies, like JDBC and EJB, as well as most any
third-party packages, like Hibernate, iBATIS, or Object Relational Bridge.
For the View, Struts works well with JavaServer Pages, including JSTL and
JSF, as well as Velocity Templates, XSLT, and other presentation systems.
The
Struts framework provides the invisible underpinnings every professional web
application needs to survive. Struts helps you create an extensible
development environment for your application, based on published standards
and proven design patterns.
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Jakarta
Struts is open source implementation of MVC (Model-View-Controller) pattern
for the development of web based applications. Jakarta Struts is robust
architecture and can be used for the development of application of any size.
Struts framework makes it much easier to design scalable, reliable Web
applications with Java.
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The
class org.apache.struts.action.ActionServlet is the called the ActionServlet.
In the the Jakarta Struts Framework this class plays the role of controller.
All the requests to the server goes through the controller. Controller is
responsible for handling all the requests.
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A:
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T
Message Resources Definitions file are simple .properties files and these
files contains the messages that can be used in the struts project. Message
Resources Definitions files can be added to the struts-config.xml file
through <message-resources /> tag.
Example:
<message-resources
parameter=\"MessageResources\" />.
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The
Action Class is part of the Model and is a wrapper around the business logic.
The purpose of Action Class is to translate the HttpServletRequest to the
business logic. To use the Action, we need to Subclass and overwrite the
execute() method. In the Action Class all the database/business processing
are done. It is advisable to perform all the database related stuffs in the
Action Class. The ActionServlet (commad) passes the parameterized class to
Action Form using the execute() method. The return type of the execute method
is ActionForward which is used by the Struts Framework to forward the request
to the file as per the value of the returned ActionForward object.
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