List<LocalDate> row5 = CollUtil.newArrayList( LocalDate.now());

        List<List<LocalDate>> rows = CollUtil.newArrayList(Collections.singleton(row5));


        ExcelWriter writer = ExcelUtil.getWriter("d:/write.xlsx");
        CellStyle cellStyle = writer.getStyleSet().getCellStyle();
        Workbook workbook = writer.getWorkbook();
        cellStyle.setDataFormat(workbook.createDataFormat().getFormat("yyyy-MM-dd"));
        writer.write(rows, true);
//关闭writer，释放内存
        writer.close();