MVC architecture
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The document describes the Model-View-Controller (MVC) architecture pattern for web applications. It consists of three components: the Model manages and represents the application's data, the View displays the data to the user, and the Controller handles interactions between the Model and View. Many frameworks like Spring and Ruby on Rails have adopted MVC concepts. The document then provides a specific example of using the Spring MVC framework to build a web application with the MVC pattern.
MVC architecture
- 2. Overview MVC structure is a design pattern for web applications, with three components: ● Model ● View ● Controller
- 3. Overview
- 4. Model ● Responsible for maintaining data ● Represents knowledge - can be a single object or a structure of objects
- 5. View ● Responsible for displaying data to user ● Representation of the model ○ presentation filter ○ shows only chosen data to the user
- 6. Controller ● Controls interactions between model & view ● Link between user and system ● The “brains” of the application ● Controls data flow into the model and updates the view when data changes
- 7. Simple Example Model View Controller HTML CSS Web Browser ● Bare text ● The content, knowledge of a web page ● Styling ● The display of a web page ● Brings it all together ● Displays the view with the knowledge of the model, allowing interaction for the user
- 8. Why is it used? ● Isolates the business logic from the user interface ● Allows the application to be skinnable ○ same data with changeable views
- 9. Frameworks Many programming frameworks have adopted MVC concepts, including: ● Spring ● Django ● Ruby on Rails ● Struts ● ASP.NET
- 10. Our project ● Spring Web MVC framework ○ DispatcherServlet ○ ModelAndView object ○ Annotations
- 11. DispatcherServlet ● Dispatches requests to controllers ● Integrated with Spring IoC container
- 12. Spring MVC
- 13. Our Structure ● Model: ModelAndView object ● View: JSP pages ● Controller: Spring MVC controller
- 14. Model: ModelAndView ● Used ModelAndView object as our model ● Spring MVC object: represents a model and view returned by a handler ● Model is a map with <K,V>
- 15. View: JSP ● Used JSP pages as the view ● Calls in attributes of the model
- 16. Controller: Spring MVC ● Defined with @Controller annotation ● @RequestMapping annotation to map URLs to particular handler methods
- 17. Spring MVC Example @RequestMapping(value = "/approvetask", method = RequestMethod.POST) public ModelAndView approveTask() { ModelAndView model = new ModelAndView(); model.addObject("msg", "You have approved an employee task."); model.setViewName("mytasks"); return model; }
- 18. Spring MVC Example <c:if test="${not empty msg}"> <div class="msg">${msg}</div> </c:if>
- 19. Spring MVC Example <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix"> <value>/WEB-INF/pages/</value> </property> <property name="suffix"> <value>.jsp</value> </property> </bean>