SpringMVC的执行流程
1.DispatcherServlet加载application.xml
2.client发起请求到DispatcherServlet
3.DispatcherServlet通过url查询HandlerMapping中的Handler,返回Mapping(包含Handler信息)
4.DispatcherServlet处理请求,调用HandlerAdapter
5.HandlerAdapter调用InterceptorStack(FILO),触发前置拦截
6.Handler(Controller)处理,逆向返回处理结果进入InterceptorStack,触发后置拦截
7.HandlerAdapter返回ModelAndView给DispatcherServlet
8.DispatcherServlet调用ViewResolver处理ModelAndView
9.ViewResolver返回View(jsp、html、css、js、img、stream、pdf等)给DispatcherServlet
10.DispatcherServlet传递Model,渲染视图,将处理完的View返还给client