springMVC objects as method parameters used ServletAPI

ServletAPI SpringMVC favor of the original object as a parameter control method.

Support original ServletAPI object has:
　　the HttpServletRequest
　　HttpServletResponse
　　the HttpSession
　　java.security.Principal
　　Locale
　　InputStream
　　OutputStream
　　Reader
　　Writer
We can put the above objects, write directly used in the process parameter control.

@RequestMapping("/testServletAPI")
public String testServletAPI(HttpServletRequest request, HttpServletResponse response, HttpSession session) {
　　System.out.println(request);
　　System.out.println(response);
　　System.out.println(session);
　　ServletContext servletContext = session.getServletContext();
　　System.out.println(servletContext);
　　return "success";
}