easyExcel实现下载（带下拉框）

@RestController
@RequestMapping("/v1/student")
public class StudentController {

	@GetMapping("/downloadTemplate")
    public void downloadTemplate(HttpServletResponse response) throws IOException {
        response.setHeader("content-Type", "octets/stream");
        response.setCharacterEncoding("utf-8");
        response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "No-cache");
        response.setDateHeader("Expires", 0);
        String encodeFileName = URLEncoder.encode("学生信息导入模板", "UTF-8");
        response.setHeader("Content-Disposition", "attachment;filename=" + encodeFileName + ".xlsx");

        ServletOutputStream outputStream = response.getOutputStream();

        ExcelWriterBuilder builder = EasyExcel.write(outputStream, StudentInfoDTO.class).registerWriteHandler(new SheetWriteHandler() {
            @Override
            public void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
            }

            @Override
            public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
                // 区间设置 第一列第一行和第二行的数据。由于第一行是头，所以第一、二行的数据实际上是第二三行
                // 实验证明，lastRow参数 使用Integer.MAX_VALUE，下拉框效果失效，故此处用一个比较大的数代替
                CellRangeAddressList cellRangeAddressList = new CellRangeAddressList(1, 1000000, 0, 0);
                DataValidationHelper helper = writeSheetHolder.getSheet().getDataValidationHelper();
                DataValidationConstraint constraint = helper.createExplicitListConstraint(
                        getAllClasses().stream().map(ClassInfoSheet::getClassNo).toArray(String[]::new));
                DataValidation dataValidation = helper.createValidation(constraint, cellRangeAddressList);
                writeSheetHolder.getSheet().addValidationData(dataValidation);
            }
        }).registerWriteHandler(new LongestMatchColumnWidthStyleStrategy());
        ExcelWriter excelWriter = builder.build();
        WriteSheet sheet1 = EasyExcel.writerSheet(0, "学生信息").head(StudentInfoDTO.class).build();
//        excelWriter.write(Lists.emptyList(), sheet1);
        excelWriter.write(new ArrayList(0), sheet1);

        //sheet对象
        WriteSheet sheet2 = EasyExcel.writerSheet(1, "班级").head(ClassInfoSheet.class).build();
        excelWriter.write(getAllClasses(), sheet2);
        //关闭流
        excelWriter.finish();
    }

    /**
     * 获取全部分公司
     *
     * @return 全部分公司
     */
    private List<ClassInfoSheet> getAllClasses() {
        List<ClassInfoSheet> classInfo = new ArrayList<>();
        classInfo.add(ClassInfoSheet.builder().classNo("C0001").className("一班").build());
        classInfo.add(ClassInfoSheet.builder().classNo("C0002").className("二班").build());
        classInfo.add(ClassInfoSheet.builder().classNo("C0003").className("三班").build());
        return classInfo;
    }

    @Data
    @Builder
    @AllArgsConstructor
    @NoArgsConstructor
    public static class ClassInfoSheet implements Serializable {
        @ExcelProperty("班级编号")
        private String classNo;

        @ExcelProperty("班级名称")
        private String className;
    }

    @Data
    @Builder
    @AllArgsConstructor
    @NoArgsConstructor
    public static class StudentInfoDTO implements Serializable {
        @ExcelProperty("班级")
        private String classNo;

        @ExcelProperty("姓名")
        private String stuName;

        @ExcelProperty("性别")
        private String stuGender;
        
    }

我的预期是：

这是一个导入模板文件，
第一个sheet页第一列【班级】可以下拉选择班级编号
第二个sheet页展示班级编号和班级名称信息

其实需求这样也算实现了，但是有一点点瑕疵就是：

第二个sheet（由于这个sheet只是查看展示使用，应该不带下拉）的第一列也带下拉框了

这个有没有大神帮忙给解决下这个问题？或者换一种方式写第二个sheet页？