Spring web Mvc framework 原文
13.1. Introduction
Spring's Web MVC framework is designed around a
All your registered beans and all of Spring's services can be at your fingertips even without Spring's web MVC. Spring doesn't compete with Struts or WebWork in this scenario, it just addresses the many areas that the pure web MVC frameworks don't, from bean configuration to data access and transaction handling. So you are able to enrich your application with a Spring middle tier and/or data access tier, even if you just want to use, for example, the transaction abstraction with JDBC or Hibernate.
13.2. The 13.3. ControllersThe notion of a controller is part of the MVC design pattern (more specifically it is the
The above class and the declaration in the web application context is all you need besides setting up a handler mapping (see the section entitled Section 13.4, “Handler mappings”) to get this very simple controller working. This controller will generate caching directives telling the client to cache things for 2 minutes before rechecking. This controller also returns a hard-coded view (which is typically considered bad practice).
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13.4. Handler mappingsUsing a handler mapping you can map incoming web requests to appropriate handlers. There are some handler mappings you can use out of the box, for example, the
All incoming requests for the URL 
Note
If you want to use the
This handler mapping routes requests for All MVC frameworks for web applications provide a way to address views. Spring provides view resolvers, which enable you to render models in a browser without tying you to a specific view technology. Out of the box, Spring enables you to use JSPs, Velocity templates and XSLT views, for example. The section entitled Chapter 14, Integrating view technologies has details of how to integrate and use a number of disparate view technologies. The two interfaces which are important to the way Spring handles views are ViewResolver and View. The ViewResolver provides a mapping between view names and actual views. The View interface addresses the preparation of the request and hands the request over to one of the view technologies. As discussed in the section entitled Section 13.3, “Controllers”, all controllers in the Spring Web MVC framework return a ModelAndView instance. Views in Spring are addressed by a view name and are resolved by a view resolver. Spring comes with quite a few view resolvers. We'll list most of them and then provide a couple of examples. Table 13.5. View resolvers13.5. Views and resolving them
13.5.1. Resolving views - the ViewResolver interface
