16-图片上传那些事 org.springframework.web.multipart.MultipartException: The current request is not a multipart request

https://blog.csdn.net/u010974598/article/details/46458039

我曾尝试了：

@RequestMapping(value="/user/register")
	 public ModelAndView toRegister(
			 Integer flag,
			 User user,
			 MultipartHttpServletRequest request,
//			 MultipartFile file,
			 ModelAndView mv) {
		if(flag == 1) {
			// 跳转到登录页面
			System.out.println("-----去注册页面---------");
			mv.setViewName("user/registerUser");
		}
		else {
//			MultipartFile file = request.getParameter("file");
			MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
			List<MultipartFile>  file = multipartRequest.getFiles("file");

			System.out.println("处理注册！\n");
			System.out.println(file.toString() + "  ====文件啊啊啊啊\n");
			//上传图像：
			String imgpath = ImageUtil.generateNormalImg(file.get(0));
			System.out.println("头像路径：" + imgpath);
			//添加到对象：
			if(imgpath != null && !imgpath.equals(""))
				user.setAvater(imgpath);
			else {
				System.out.println("获取图片路径失败！");
			}
			userService.addUser(user);
			System.out.println("注册的用户为：" + user.toString());
			mv.setViewName("redirect:/loginForm");
		}
		return mv;
	}