code: public void write2File(String filePath) throws Excel4JException {
  
          try (FileOutputStream fos = new FileOutputStream(filePath)) {
              this.workbook.write(fos);
          } catch (IOException e) {
              throw new Excel4JException(e);
          }
      }
docs: 将文件写到相应的路径下
  
  @param filePath 输出文件路径