Technical-paper

MVC (Spring MVC)

Abstract :

The MVC architecture was developed to make development of web applications in rapid and parallel manner. If an MVC model is used to develop any particular web application then it is possible that the application can be developed three times faster than normal development. This is possible because the Model, View and Controller can be developed by three developers parallely at the same time. ___

Introduction :

Model–view–controller (MVC) is a software design pattern commonly used for developing user interfaces that divide the related program logic into three interconnected elements. ___

Model , View , Controller :

Model :

A model contains the data of the application. A data can be a single object or a collection of objects.

View :

A view represents the provided information in a particular format. Generally, JSP+JSTL is used to create a view page.

Controller :

A controller contains the business logic of an application. Here, the @Controller annotation is used to mark the class as the controller. ___

Spring MVC :

A Spring MVC is a Java framework which is used to build web applications. It also follows the Model-View-Controller design pattern. It implements all the basic features of a core spring framework like Inversion of Control, Dependency Injection. A Spring MVC provides an elegant solution to use MVC in spring framework by the help of DispatcherServlet. Here, DispatcherServlet is a class that receives the incoming request and maps it to the right resource such as controllers, models, and views..

In the image given below the Front Controller represents the Dispatcher Servelet and the process happening in the Spring MVC can be understood easily by viewing it

Process behind the scenes :

• After receiving an HTTP request, (Front Controller)Dispatcher Servlet consults the Handler Mapping to call the appropriate Controller.
• The Controller takes the request and calls the appropriate service methods based on the used GET or POST method. The service method will set model data based on defined business logic and returns view name to the Dispatcher Servlet.
• The Dispatcher Servlet will take help from View Resolver to pickup the defined view for the request.
• Once view is finalized, The Dispatcher Servlet passes the model data to the view which is finally rendered on the browser. ___

  Advantages of Spring MVC Framework :

• Predefined Templates :

  Spring framework provides templates for JDBC, Hibernate, JPA etc. technologies. So there is no need to write too much code. It hides the basic steps of these technologies.

• Loose Coupling :

  The Spring applications are loosely coupled because of dependency injection.

• Easy to test :

  The Dependency Injection makes easier to test the application. The EJB or Struts application require server to run the application but Spring framework doesn’t require server.

• Lightweight :

  Spring framework is lightweight because of its POJO implementation. The Spring Framework doesn’t force the programmer to inherit any class or implement any interface. That is why it is said noninvasive.

• Fast Development :

  The Dependency Injection feature of Spring Framework and it support to various frameworks makes the easy development of JavaEE application.

• Powerful abstraction :

  It provides powerful abstraction to JavaEE specifications such as JMS, JDBC, JPA and JTA.

• Declarative support :

  It provides declarative support for caching, validation, transactions and formatting. ___ MVC patterns separate the input, processing, and output of an application.

  Conclusion :

  Every framework has its own importance. In the case of Spring MVC it is that rapid and parallel development can be done which saves more time.

  References :

• Javatpoint.
• spring.io.