请求端：

1. 封装参数

MultiValueMap<String, Object> multiValueMap = new LinkedMultiValueMap<>();
        List<Resource> tmpResource = new ArrayList<>();
        Arrays.stream(multipartfiles).forEach(multipartFile -> {
            tmpResource.add(multipartFile.getResource());
        });
        multiValueMap.addAll("file", tmpResource);
        multiValueMap.add("req", fileUploadReq);

2.远程调用

Resp result = BaseUtil.postForObject2(restTemplate, RestApi.UPLOAD_FILE, multiValueMap, Resp.class, MediaType.MULTIPART_FORM_DATA);
        if (null != result && result.getCode().equals(CODE.success.getCode())) {
            log.info("RestApi.UPLOAD_FILE=====" + result.getCode());
        }

远程调用中封装的postForObject2方法

public static <T> T postForObject2(RestTemplate restTemplate, String url, Object obj, Class<T> respType, MediaType mediaType) {
        log.info("开始调用远程服务....");
        if (StringUtil.isNull(url)) {
            log.error("请求url不能为空");
            return null;
        }
        if (null == respType) {
            log.error("响应类型不能为空");
            return null;
        }
        log.info("请求地址：" + url);
        log.info("请求参数：" + (obj == null ? "" : obj.toString()));

        /**设置请求头*/
        HttpHeaders headers = new HttpHeaders();
        if (mediaType == null) {
            headers.setContentType(MediaType.APPLICATION_JSON);
        } else {
            headers.setContentType(mediaType);
        }

        /**设置请求体*/
        HttpEntity<Object> entity = new HttpEntity<>(obj, headers);

        /**请求*/
        T resp;
        try {
            resp = restTemplate.postForObject(url, entity, respType);
            log.info("响应结果：" + (resp == null ? null : resp.toString()));
        } catch (Exception e) {
            log.error("远程调用异常：" + e.toString());
            return null;
        }
        log.info("调用远程服务完成====");
        return resp;
    }

服务端：

    /**
     * 服务之间调用上传文件入口
     * @param file
     * @param req
     * @return
     * @throws Exception
     */
    @RequestMapping("uploadFileCommonForService")
    public FileUploadReq uploadFileCommonForService(@Valid List<MultipartFile> file, @RequestPart FileUploadReq req) throws Exception {
        return iFileUploadService.uploadFileCommon(file, req);
    }

另外一种方式 feigin方式传递文件：https://blog.csdn.net/buyaopingbixiazai/article/details/115537084