springboot文件上传失败

1.已经配置spring...enbled=true，文件很小1k不到，1.txt
2. 给出异常
java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver configured?
3.给出代码

 @RequestMapping(value="/file/upload", method = RequestMethod.POST)
    @ResponseBody
    public String upload(@RequestParam("file") MultipartFile file){

        return "productList";
    }

4 postman测试 key=file, value=1.txt

看一下别人的解决方案是否可行
http://stackoverflow.com/questions/27050018/spring-file-upload-getting-expected-multiparthttpservletrequest-is-a-multipar

个人的上传图片代码

   @RequestMapping("/imageUpload")
    @ResponseBody
    public PhotoResult imageUpload(@RequestParam(value = "editormd-image-file",required = true) MultipartFile file){
        }

没做过多的配置。