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Rendering the UI for a web application is a separate concern from handling web requests, and thus is considered a separate layer of the system. The controllers are responsible for delegating to the domain model, collecting the results, and then delegating to the UI (or view) for actual rendering of the response. The controller does not actually render the view because of the single responsibility principle (see 5). Handling web requests and rendering views are two separate responsibilities, and a controller class would need to change if the API of the business logic changes and if the rendering of the view changes. This is one responsibility too many, which is why controllers in Spring MVC are designed to delegate to a view for rendering the UI. UIs for the Web are primarily encoded in XHTML with CSS, but there are many other options available. Depending on the situation, users may expect Excel spreadsheets, Portable Document Format (PDF) files, graphics, or simple text files. Spring MVC supports all these UI options with ease, along with many different options for rendering XHTML, including JSP, Velocity, and FreeMarker. In typical Spring Framework style, there is no one preferred method for rendering the view. Instead, it makes integration with a wide variety of toolkits available in order to give you the greatest set of choices.
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Spring MVC is composed of many different moving parts, all configured and managed by the DispatcherServlet servlet. Here, we ll provide an overview of the components of the Spring MVC architecture and how they work.
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In this section, we will enumerate the elements of Spring MVC so that you will have a good picture of what functionality is available to you.
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As mentioned previously, DispatcherServlet is the front controller for a Spring MVC application. All requests pass through this servlet, as it manages all of the different elements that have a chance to process the request. DispatcherServlet is not meant for subclassing; instead, it is simply declared and configured by you, just like a normal servlet inside a web application. All of the real work is performed by delegates.
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The job of handling individual page requests is given to controllers. Spring MVC provides a rich collection of controller types, from simple handlers with no workflow to full-featured, form-handling, life-cycle controllers. The following are some of the controllers provided by Spring MVC:
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CHAPTER 8 SPRING MVC
Simple servlet-like controllers Controllers to manage an XHTML form life cycle Wizard controllers to manage a simple ordered process WebWork-like one-off (disposable) controllers Flexible, multiaction controllers, able to handle many different requests You can easily extend the provided controllers if you don t find one that meets your exact needs. Controllers are responsible only for accepting a new request, delegating to the domain model, and collecting the result. The controller then creates a model in order to pass it along to the view. The controller does not manage view rendering, but it usually performs view selection. Typically, controllers are stateless. This means that each controller handles multiple requests concurrently. Therefore, you should not store state during processing of a request in instance properties of the controller.
HandlerMapping Interface
The job of analyzing a request to determine which controller is called is given to the HandlerMapping interface. Typically, the URI is the determining factor, but the HandlerMapping interface is well abstracted. You may choose to map to controllers based on cookies, session variables, time of day, or some combination. It s even possible to declare and configure multiple HandlerMapping instances in order to accommodate multiple resolution strategies. You may even specify the order in which the HandlerMapping instances are consulted.
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