code: public static SheetTemplate sheetTemplateBuilder(String templatePath)
              throws Excel4JException {
          SheetTemplate sheetTemplate = new SheetTemplate();
          try {
              // 读取模板文件
              sheetTemplate.workbook = WorkbookFactory.create(new FileInputStream(new File(templatePath)));
          } catch (Exception e) {
              // 读取模板相对文件
              try {
                  sheetTemplate.workbook = WorkbookFactory.create(
                          SheetTemplateHandler.class.getResourceAsStream(templatePath)
                  );
              } catch (IOException | InvalidFormatException e1) {
                  throw new Excel4JException(e1);
              }
          }
          return sheetTemplate;
      }
docs: 构建SheetTemplate