/**
     * 1.Spring MVC 获取原生的servlet API <br />
     * 2.当请求方法的参数上加上原生的Servlet API类型请求参数 时，Spring MVC会自动注入对于类型的入参<br />
     * 3.MVC Handller 方法可以接收的ServletAPI类型参数有 :
     *   1) HttpServletRequest 
     *   2) HttpServletResponse 
     *   3) HttpSession 
     *   4) java.security.Principal 
     *   5) Locale
     *   6) InputStream
     *   7) OutputStream
     *   8) Reader
     *   9) Writer 
     * @param request
     * @param response
     * @return
     */
    @RequestMapping("index")
    public String index(HttpServletRequest request , HttpServletResponse response ) {
        System.out.println("request:" + request);
        return "index";
    }
    
    public String index2(HttpServletResponse response , @RequestParam("name")String name) {
        return "index";
    }