code: public void setContext(Context context) {
      super.setContext(context);
      if (null != context) {
        Object count = context.getDatas().get("countPerSheet");
        if (null != count && Numbers.isDigits(count.toString())) {
          int countParam = Numbers.toInt(count.toString());
          if (countParam > 0) this.countPerSheet = countParam;
        }
      }
    }
docs: {@inheritDoc} 设置每个sheet多少条记录