spring cloud feign client 上传文件遇到问题记录

项目中用FeignClient上传文件时，发现大小无法大于1M,代码如下：

MultiValueMap<String, String> requestMap = new LinkedMultiValueMap<String, String>();
OptUploadFileByteInfoReqDto optUploadFileByteInfoReqDto = new OptUploadFileByteInfoReqDto();
optUploadFileByteInfoReqDto.setFileByteArray(file.getBytes());
optUploadFileReqDto.setUploadFileByteInfoReqDto(optUploadFileByteInfoReqDto);
requestMap.add("file", JSON.toJSONString(optUploadFileReqDto));

// TODO 待修改,增加loginAuthDto
response = opcRpcService.uploadFile(file, null);

------------------------------

@Transactional(rollbackFor = Exception.class)
public OptUploadFileRespDto uploadFile(MultiValueMap<String, String> requestMap, LoginAuthDto loginAuthDto) {
   Wrapper<OptUploadFileRespDto> response = opcOssFeignApi.uploadFile(requestMap);
   log.info("----- 上传文件响应：{}", response);
   if (response != null && response.success()) {
      OptUploadFileRespDto result = response.getResult();
      MdcAttachment mdcAttachment = new MdcAttachment();
      mdcAttachment.setAttachmentNo(result.getRefNo());
      mdcAttachment.setBucketName(result.getAttachmentPath());
      mdcAttachment.setRefNo(result.getRefNo());
      mdcAttachment.setName(result.getAttachmentName());
      mdcAttachment.setPath(result.getAttachmentUrl());
      mdcAttachment.setType(result.getFileType());
      mdcAttachment.setFormat(result.getFileType());
      // TODO 待修改，去除非空判断
      mdcAttachment.setCreator(loginAuthDto != null ? loginAuthDto.getLoginName() : null);
      mdcAttachment.setCreatorId(loginAuthDto != null ? loginAuthDto.getAccountId() : null);
      mdcAttachment.setCreatedTime(LocalDateTime.now());
      mdcAttachment.setUpdateTime(LocalDateTime.now());
      mdcAttachmentMapper.insertSelective(mdcAttachment);
      result.setAttachmentId(mdcAttachment.getId());
      return result;
   }
   return null;
}

------------------------------

public class OpcAttachmentFeignClient extends BaseController implements OpcOssFeignApi {

 @Resource
    private OpcAttachmentService opcAttachmentService;
    @Resource
    private OpcAliOssService opcAliOssService;

    @Override
    @ApiOperation(httpMethod = "POST", value = "上传文件")
    public Wrapper<OptUploadFileRespDto> uploadFile(MultiValueMap<String, String> requestMap) {
        OptUploadFileReqDto optUploadFileReqDto = JSON.parseObject(requestMap.getFirst("file"),
                OptUploadFileReqDto.class);
        String fileType = optUploadFileReqDto.getFileType();
        String fileName = LocalDateTime.now().format(DateUtil.DATE_FORMAT_30) + RandomUtil.createNumberCode(4) + "."
                + fileType;

        OptUploadFileRespDto optUploadFileRespDto = null;
        try {
            optUploadFileRespDto = opcAliOssService
                    .uploadFile(optUploadFileReqDto.getUploadFileByteInfoReqDto().getFileByteArray(), fileName);
        } catch (IOException e) {
            e.printStackTrace();
            logger.error("上传文件发生异常:{}", e.getMessage());
            return WrapMapper.error("上传文件发生异常");
        }
        if (optUploadFileRespDto != null) {
            optUploadFileRespDto.setFileType(fileType);
        }
        return WrapMapper.ok(optUploadFileRespDto);
    }

 当文件>1M时，被调用的uploadFile方法的requestMap就变成空了，原因不明。

于是换了种写法：

    @Transactional(rollbackFor = Exception.class)
    public OptUploadFileRespDto uploadFile(MultipartFile file, LoginAuthDto loginAuthDto) {

        Wrapper<OptUploadFileRespDto> response = opcOssFeignApi.handleFileUpload(file);
        log.info("----- 上传文件响应：{}", response);
        if (response != null && response.success()) {
            OptUploadFileRespDto result = response.getResult();
-------------

@Override
public Wrapper<OptUploadFileRespDto> handleFileUpload(@RequestPart(value = "file") MultipartFile file) {
   String fileType = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(".") + 1);
   String fileName = LocalDateTime.now().format(DateUtil.DATE_FORMAT_30) + RandomUtil.createNumberCode(4) + "."
         + fileType;
   OptUploadFileRespDto optUploadFileRespDto = null;
   try {
      optUploadFileRespDto = opcAliOssService
            .uploadFile(file.getBytes(), fileName);
   } catch (IOException e) {
      e.printStackTrace();
      logger.error("上传文件发生异常:{}", e.getMessage());
      return WrapMapper.error("上传文件发生异常");
   }
   if (optUploadFileRespDto != null) {
      optUploadFileRespDto.setFileType(fileType);
   }
   return WrapMapper.ok(optUploadFileRespDto);
}

问题没了