spring-mvc-基础

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核心入口功能定位：
HttpServletBean：完成的是配置元素的依赖注入
FrameworkServle：t完成的是容器上下文的建立
DispatcherServlet：完成的是SpringMVC具体编程元素的初始化策略。


spring-web 和spring-webmvc：

spring-web provides core HTTP integration, including some handy Servlet filters, Spring HTTP Invoker, infrastructure to integrate with other web frameworks and HTTP technologies e.g. Hessian, Burlap.

spring-webmvc is an implementation of Spring MVC. spring-webmvc depends on on spring-web, thus including it will transitively add spring-web. You don't have to add spring-web explicitly.

You should depend only on spring-web if you don't use Spring MVC but want to take advantage of other web-related technologies that Spring supports.