DispatchServlet调用栈

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当Web服务器(Apache )收到指向Servlet的请求后并没有将请求交给Servlet本身，而是交给管理Servlet的容器(Tomcat)。在SpringMVC中，前端控制器DispatchServlet是一个Servlet，它的方法会被容器调用。调用栈顺序从上到下为：

DispatcherServlet(HttpServlet).service(ServletRequest, ServletResponse) line: 729

DispatcherServlet(FrameworkServlet).service(HttpServletRequest, HttpServletResponse) line: 845
DispatcherServlet(HttpServlet).service(HttpServletRequest, HttpServletResponse) line: 622

DispatcherServlet(FrameworkServlet).doGet(HttpServletRequest, HttpServletResponse) line: 860

DispatcherServlet(FrameworkServlet).processRequest(HttpServletRequest, HttpServletResponse) line: 969

DispatcherServlet.doService(HttpServletRequest, HttpServletResponse) line: 893

DispatcherServlet.doDispatch(HttpServletRequest, HttpServletResponse) line: 917

在doDispatch中获得处理器Handler（实际是一个HandlerExecutionChain）和处理器适配器 HandlerAdaptor，最后通过HandlerAdaptor调用实际的处理器。

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