Antd多文件上传后台接收为null问题

    const onRemove = (file) => {
      this.setState((state) => {
        const index = state.fileList.indexOf(file);
        const newFileList = state.fileList.slice();
        newFileList.splice(index, 1);
        return {
          fileList: newFileList,
        };
      });
    };
    
    const beforeUpload = (file) => {
      const isJpgOrPng = file.type === 'image/jpeg' || file.type === 'image/png';
      if (!isJpgOrPng) {
        message.error('请上传图片格式文件!');
        return isJpgOrPng || Upload.LIST_IGNORE;
      }
      this.setState(state => ({
        fileList: [...state.fileList, file],
      }));
      return false;
    };

    <Upload
      fileList={fileList}
      onRemove={onRemove}
      beforeUpload={beforeUpload}
      directory
      accept=".png,.jpg,.jpeg"
      showUploadList={false}
      onChange={this.onChange}
    >
      <Button
        icon={<UploadOutlined />}
      >
        Click to upload
      </Button>
    </Upload>
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    const formData = new FormData();
    // 组装数据
    fileList.forEach((file) => {
      formData.append('files', file);
    });
    formData.append('id', galleryId);
    // 保存图片请求接口
    reqwest({
      // 上传url
      url: 'url',
      method: 'post',
      // 必须false才会避开jQuery对 formdata 的默认处理
      processData: false,  
      // 必须false才会自动加上正确的Content-Type        
      contentType: false, 
      data: formData,
      success: (res) => {
          message.success('上传图片成功');
      },
      error: () => {
          message.error('上传图片失败');
      },
    });
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    public Message insertPic(@RequestParam(value = "files", required = true) MultipartFile[] files) {
        // 判断file数组不能为空并且长度大于0
        if (files != null && files.length > 0) {
            //循环获取file数组中得文件
            for (int i = 0; i < files.length; i++)  {
                    MultipartFile file = files[i];
            }
        }
    }

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 fileList.forEach((file) => {
    formData.append('files', file.originFileObj, file.name);
 });
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