EasyExcel 复杂表头的导出（动态表头和静态表头）

问题：如图，1部分的表头是动态的根据日期变化，2部分是数据库对应的字段，静态不变的；

解决方案：如果不看1的部分，2部分+内容可以根据实体类+注解的方式导出，那么我们是不是可以先将动态表头1 写入到Excel中，然后再用注解+实体类的方式将2部分和内容写入到Excel中。

// 以下是伪代码参考，无法直接运行

// 设置动态表头
List<String> head = new ArrayList<>();

String name = String.format(sheetName, LocalDate.now().getYear(), LocalDate.now().getMonth().getValue());

if (StringUtils.isNotBlank(publicityReq.getCountyId())) {
    name = name + "\n" + depart + departName;
}

head.add(name);
headList.add(head);

ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream(), TPublicityInfo.class).build();
// 创建sheet
WriteSheet writeSheet = EasyExcel.writerSheet(String.format(sheetName, LocalDate.now().getYear(), LocalDate.now().getMonth().getValue())).needHead(Boolean.FALSE).build();
// 将动态表头写入sheet，new ArrayList<>()代表写入空数据
WriteTable writeTable0 = EasyExcel.writerTable(0).head(headList).registerWriteHandler(new OnceAbsoluteMergeStrategy(0, 2, 0, 7)).needHead(Boolean.TRUE).build();

excelWriter.write(new ArrayList<>(), writeSheet, writeTable0);
// 将静态表头+内容写入sheet，tPublicityInfos代表内容数据
WriteTable writeTable2 = EasyExcel.writerTable(3).head(TPublicityInfo.class).relativeHeadRowIndex(2).needHead(Boolean.TRUE).build();

excelWriter.write(tPublicityInfos, writeSheet, writeTable2);
excelWriter.finish();

下边是项目中的完整代码，可以做简单参考

public void exportExcel(Principal principal, HttpServletResponse response, PublicityInfoReq publicityReq) throws IOException {
    String sheetName = "%s年%s月xxxx";
    String depart = "单位：";
    String personId = AuthenticationInfo.getUserId(principal);
    String departsCode = "";
    if (StringUtils.isNotEmpty(publicityReq.getCorpId())) {
        DepartInfo departInfo = iDepartSCodeService.getVDeptById(publicityReq.getCorpId());
        departsCode = departInfo.getDepartScode();
    } else {
        departsCode = iDepartSCodeService.getDeptScode(personId);
    }
    publicityReq.setDepartsCode(departsCode);

    List<TPublicityInfo> tPublicityInfos = publicityMapper.listByPublicity(publicityReq);

    if (CollectionUtils.isNotEmpty(tPublicityInfos)) {
        for (int i = 0; i < tPublicityInfos.size(); i++) {
            TPublicityInfo tPublicityInfo = tPublicityInfos.get(i);
            tPublicityInfo.setNum(i+1);
        }
    }

    List<String> departNames = this.baseMapper.selectDepartNameByDepartId(publicityReq.getCountyId());

    String departName = "";
    if (CollectionUtils.isNotEmpty(departNames) && departNames.size() == 1) {
        departName = departNames.get(0);
    }
    List<List<String>> headList = new ArrayList<>();
    List<String> head = new ArrayList<>();

    String name = String.format(sheetName, LocalDate.now().getYear(), LocalDate.now().getMonth().getValue());

    if (StringUtils.isNotBlank(publicityReq.getCountyId())) {
        name = name + "\n" + depart + departName;
    }

    head.add(name);
    headList.add(head);

    ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream(), TPublicityInfo.class).build();

    WriteSheet writeSheet = EasyExcel.writerSheet(String.format(sheetName, LocalDate.now().getYear(), LocalDate.now().getMonth().getValue())).needHead(Boolean.FALSE).build();

    WriteTable writeTable0 = EasyExcel.writerTable(0).head(headList).registerWriteHandler(new OnceAbsoluteMergeStrategy(0, 2, 0, 7)).needHead(Boolean.TRUE).build();

    excelWriter.write(new ArrayList<>(), writeSheet, writeTable0);

    WriteTable writeTable2 = EasyExcel.writerTable(3).head(TPublicityInfo.class).relativeHeadRowIndex(2).needHead(Boolean.TRUE).build();
    excelWriter.write(tPublicityInfos, writeSheet, writeTable2);
    excelWriter.finish();
}

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