code: public void transferItem() {
      if (null == attrs) {
        super.transferItem();
        return;
      }
      Object[] values = new Object[attrs.length];
      for (int i = 0; i < values.length; i++) {
        try {
          values[i] = propertyExtractor.getPropertyValue(getCurrent(), attrs[i]);
        } catch (Exception e) {
          transferResult.addFailure(TransferMessage.ERROR_ATTRS_EXPORT, "occur in get property :" + attrs[i]
              + " and exception:" + e.getMessage());
        }
      }
      writer.write(values);
    }
docs: 转换单个实体