Spring MVC 支持使用原生的ServletAPI

• 支持如下的类型
• HttpServletRequest
• HttpServletResponse
• HttpSession
• java.security.Principal
• Locale InputStream
• OutputStream
• Reader
• Writer
• 只需写入形参，就可以得到当前请求的类型参数
• 代码如下

    @RequestMapping("/testServletAPI")
    public void testServletAPI(HttpServletRequest request,HttpServletResponse response, Writer out) throws IOException {
        System.out.println("testServletAPI, " + request + ", " + response);
        out.write("hello springmvc");
//      return SUCCESS;
    }