JAVA中excel导出一对多合并具体实现

@Getter
@Setter
@EqualsAndHashCode
// 将第6-7行的2-3列合并成一个单元格
// @OnceAbsoluteMerge(firstRowIndex = 5, lastRowIndex = 6, firstColumnIndex = 1, lastColumnIndex = 2)
public class DemoMergeData {
    // 这一列 每隔2行 合并单元格
    @ContentLoopMerge(eachRow = 2)
    @ExcelProperty("字符串标题")
    private String string;
    @ExcelProperty("日期标题")
    private Date date;
    @ExcelProperty("数字标题")
    private Double doubleData;
}

   /**
     * 合并单元格
     * <p>
     * 1. 创建excel对应的实体对象 参照{@link DemoData} {@link DemoMergeData}
     * <p>
     * 2. 创建一个merge策略 并注册
     * <p>
     * 3. 直接写即可
     *
     * @since 2.2.0-beta1
     */
    @Test
    public void mergeWrite() {
        // 方法1 注解
        String fileName = TestFileUtil.getPath() + "mergeWrite" + System.currentTimeMillis() + ".xlsx";
        // 在DemoStyleData里面加上ContentLoopMerge注解
        // 这里 需要指定写用哪个class去写，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
        EasyExcel.write(fileName, DemoMergeData.class).sheet("模板").doWrite(data());
        // 方法2 自定义合并单元格策略
        fileName = TestFileUtil.getPath() + "mergeWrite" + System.currentTimeMillis() + ".xlsx";
        // 每隔2行会合并 把eachColumn 设置成 3 也就是我们数据的长度，所以就第一列会合并。当然其他合并策略也可以自己写
        LoopMergeStrategy loopMergeStrategy = new LoopMergeStrategy(2, 0);
        // 这里 需要指定写用哪个class去写，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
        EasyExcel.write(fileName, DemoData.class).registerWriteHandler(loopMergeStrategy).sheet("模板").doWrite(data());
    }

@Data
public class BaseDTO {
    @Excel(needMerge = true,name = "序号",width = 5)
    private Integer num;
    @Excel(needMerge = true,name = "企业名称",width = 30)
    private String companyName;
    @Excel(needMerge = true,name = "企业类型",width = 18)
    private String type;
    @ExcelCollection(name = "短板指标评分标准")
    private List<ScoreRange> scoreRange;
}
@Data
public class ScoreRange {
    @Excel(name = "评分区间名称", width = 60)
    private String scoreRangeName;
    @Excel(name = "分值", width = 10)
    private String scoreRangeValue;
}

    public void downloadAnalysisList(HttpServletResponse response) throws Exception {
       String date = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy年MM月dd日HH时mm分ss秒"));
       String fileName = "企业_" + date;
       //需要导出的数据，若返回结果不是上述实体BaseDTO，需要做个映射
	   List<BaseDTO> list= getData();
	   ExcelUtils.exportExcel(fileName+".xlsx", response, CultivationAnalysisRateChangeExportDTO.class, result, fileName);
}

public class ExcelUtils {
    public static void exportExcel(String fileName, HttpServletResponse response, Class<?> pojoClass, List<?> list, String title) {
        ExportParams params = new ExportParams();
        params.setSheetName(title);
        Workbook workbook = ExcelExportUtil.exportExcel(params, pojoClass, list);
        downLoadExcel(fileName, response, workbook);
    }
    public static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
            fileName = new String(fileName.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1);
            response.setCharacterEncoding("utf-8");
            response.setHeader("content-Type", "application/octet-stream");
            response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
        try {
            workbook.write(response.getOutputStream());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}