easypoi多级动态表头

public static void main(String[] args) throws IOException {
        // exportList为表头总的集合，导出的EXCEL表格的表头完全是按照这个来生成的
        List<ExcelExportEntity> exportList = new ArrayList<>();
        // 创建最底部的一级表头10个
        ExcelExportEntity A1 = new ExcelExportEntity("一级表头A1", "a1");
        ExcelExportEntity A2 = new ExcelExportEntity("一级表头A2", "a2");
        ExcelExportEntity B1 = new ExcelExportEntity("一级表头B1", "b1");
        ExcelExportEntity B2 = new ExcelExportEntity("一级表头B2", "b2");
        ExcelExportEntity B3 = new ExcelExportEntity("一级表头B3", "b3");
        ExcelExportEntity C1 = new ExcelExportEntity("一级表头C1", "c1");
        ExcelExportEntity C2 = new ExcelExportEntity("一级表头C2", "c2");
        ExcelExportEntity D1 = new ExcelExportEntity("一级表头D1", "d1");
        ExcelExportEntity D2 = new ExcelExportEntity("一级表头D2", "d2");
        ExcelExportEntity D3 = new ExcelExportEntity("一级表头D3", "d3");

        // 创建二级表头，并将二级表头对应的下级一级表头放入其中，以此类推...
        ExcelExportEntity A = new ExcelExportEntity("二级表头A", "a");
        A.setList(Arrays.asList(A1, A2));
        ExcelExportEntity B = new ExcelExportEntity("二级表头B", "b");
        B.setList(Arrays.asList(B1, B2, B3));
        ExcelExportEntity C = new ExcelExportEntity("二级表头C", "c");
        C.setList(Arrays.asList(C1, C2));
        ExcelExportEntity D = new ExcelExportEntity("二级表头D", "d");
        D.setList(Arrays.asList(D1, D2, D3));

        ExcelExportEntity AA = new ExcelExportEntity("三级表头AA", "aa");
        AA.setList(Arrays.asList(A, B, C));
        ExcelExportEntity AB = new ExcelExportEntity("三级表头BB", "bb");
        AB.setList(Arrays.asList(D));




        ExcelExportEntity XYZ = new ExcelExportEntity("四级表头", "xyz");
        XYZ.setList(Arrays.asList(AA, AB));

        // 最后表头设置完毕，将总和起来的四级表头放入
        exportList.add(XYZ);
        // EXCEL导出参数
        ExportParams params = new ExportParams("表格标题", "随便取个sheet名", ExcelType.XSSF);
        // 导出的表格
        // Workbook sheets = ExcelExportUtil.exportBigExcel(params, exportList, "查询数据用的接口"：service, "查询数据接口要用到的查询参数":queryParams);
        List<Map<String, Object>> titles = new ArrayList<>();
        List<Map<String, Object>> data = new ArrayList<>();//数据为空
        Map<String, Object> map = ExcelUtils.createDynamicHeaderSheetMap(data, exportList, params);
        //        params.setSheetName("");
        //        params.setStyle(ExcelStyle.class);
        titles.add(map);
        Workbook dynamicHeaderSheets = ExcelUtils.createDynamicHeaderSheets(titles, ExcelType.XSSF, false);
        FileOutputStream fos = new FileOutputStream(new File("C:\\Users\\farben\\Desktop\\a.xlsx"));
        dynamicHeaderSheets.write(fos);
    }