code: @SuppressWarnings("unchecked")
      public Workbook create(Object bean) {
          optionsSheet = sheet.getWorkbook().getSheet("Options");
  
          for (val field : bean.getClass().getDeclaredFields()) {
              if (Fields.shouldIgnored(field, ExcelColIgnore.class)) continue;
              if (field.getName().endsWith("Tmpl")) continue;
  
              processExcelCellAnnotation(field, bean);
              processExcelRowsAnnotation(field, bean);
          }
  
          fixRowsHeight();
          PoiUtil.removeOtherSheets(sheet);
  
  
          val wb = sheet.getWorkbook();
          wb.setPrintArea(0, 0, PoiUtil.findMaxCol(sheet), 0, sheet.getLastRowNum());
          return wb;
      }
docs: 根据JavaBean，在模板页基础上生成Excel.