docs: private ByteArrayInputStream generateThumbImageByDefault(InputStream inputStream) throws IOException {
          LOGGER.debug("根据默认配置生成缩略图");
          // 在内存当中生成缩略图
          ByteArrayOutputStream out = new ByteArrayOutputStream();
          //@formatter:off
          Thumbnails
                  .of(inputStream)
                  .size(thumbImageConfig.getWidth(), thumbImageConfig.getHeight())
                  .toOutputStream(out);
          //@formatter:on
          return new ByteArrayInputStream(out.toByteArray());
      }