feign 同时传递对象和MultipartFile的临时解决方案(对象封装成json字符串再解析)

临时解决方案：

    
    public OssFileDTO saveFile(MultipartFile mpFile, OssFileDTO ossFile) {
        if (mpFile != null) {
            OssMultipartFileHandler.appendFileInfo(ossFile, mpFile);
            return client.uploadAndSaveFile(mpFile, JSON.toJSONString(ossFile));
        } else {
            throw new BusinessException("上传的文件不能为空");
        }
    }

    
    @Override
    @PostMapping(value = "/uploadAndSaveFile", produces = {MediaType.APPLICATION_JSON_VALUE}, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public OssFileDTO uploadAndSaveFile(@RequestPart("file") MultipartFile mpFile, @RequestPart("json") String json) {
        return fileService.uploadAndSaveFile(mpFile, json);
    }

    @SneakyThrows
    @Override
    public OssFileDTO uploadAndSaveFile(MultipartFile mpFile, String json) {
        //1.解析文件信息
        OssFileDTO dto = JSON.toJavaObject(JSON.parseObject(json), OssFileDTO.class);
	    ...
        return dto;
    }