code: public static ExcelReader getReader(String bookFilePath, int sheetIndex) {
  		try {
  			return new ExcelReader(bookFilePath, sheetIndex);
  		} catch (NoClassDefFoundError e) {
  			throw new DependencyException(ObjectUtil.defaultIfNull(e.getCause(), e), PoiChecker.NO_POI_ERROR_MSG);
  		}
  	}
docs: 获取Excel读取器，通过调用{@link ExcelReader}的read或readXXX方法读取Excel内容
  
  @param bookFilePath Excel文件路径，绝对路径或相对于ClassPath路径
  @param sheetIndex sheet序号，0表示第一个sheet
  @return {@link ExcelReader}
  @since 3.1.1