Java中EasyPoi导出复杂合并单元格的方法

前言：

上星期做了一个Excel的单元格合并，用的是EasyPoi，我之前合并单元格都是原生的，第一次使用EasyPoi合并也不太熟悉，看着网上自己套用，使用后发现比原生的方便些，贡献一下，也给其他用到合并而且用的是EasyPoi的小伙伴节省下时间。

导出模板：

坐标：

版本号，自己来定，可以去官网查看：EasyPoi官网

<!-- easypoi 导入包 -->
    <dependency>
      <groupId>cn.afterturn</groupId>
      <artifactId>easypoi-base</artifactId>
      <version>4.0.0</version>
    </dependency>

    <dependency>
      <groupId>cn.afterturn</groupId>
      <artifactId>easypoi-annotation</artifactId>
      <version>4.0.0</version>
    </dependency>

实现代码：

 //表头设置
        List<ExcelExportEntity> colList = new ArrayList<ExcelExportEntity>();

        ExcelExportEntity colEntity = new ExcelExportEntity("经销商", "distributorName");
        colEntity.setNeedMerge(true);
        colEntity.setWidth(20);
        colList.add(colEntity);

        colEntity = new ExcelExportEntity("科室", "dept");
        colEntity.setNeedMerge(true);
        colList.add(colEntity);

        colEntity = new ExcelExportEntity("部门", "region");
        colEntity.setNeedMerge(true);
        colList.add(colEntity);

        colEntity = new ExcelExportEntity("省份", "province");
        colEntity.setNeedMerge(true);
        colList.add(colEntity);

        colEntity = new ExcelExportEntity("门店数量", "storeNum");
        colEntity.setNeedMerge(true);
        colEntity.setStatistics(true);
        colList.add(colEntity);
        Map<String, Integer> map = DateUtils.getLastDayOfMonthByStr(request.getMonthStr());
        Integer dayNum = map.get("dayNum");

        for (int i = 1; i <= dayNum; i++) {
          ExcelExportEntity group_1 = new ExcelExportEntity(i + "日", "day");
          List<ExcelExportEntity> exportEntities = new ArrayList<>();
          ExcelExportEntity appalyExcel = new ExcelExportEntity("申请数量", "applyNum" + i);
          appalyExcel.setStatistics(true);
          exportEntities.add(appalyExcel);
          ExcelExportEntity adoptExcel = new ExcelExportEntity("通过数量", "adoptNum" + i);
          adoptExcel.setStatistics(true);
          exportEntities.add(adoptExcel);
          group_1.setList(exportEntities);
          colList.add(group_1);
        }
        //文件数据
        List<Map<String, Object>> list = new ArrayList<>();
        List<StoreNewAddReportVO.DistributorStoreNewAddReportVO> disList = register.getStoreNewAddReportVO().getDistributorStoreNewAddReportVOList();
        int size = disList.size();
        for (int i = 0; i < size; i++) {
          StoreNewAddReportVO.DistributorStoreNewAddReportVO dis = disList.get(i);
          Map<String, Object> valMap = new HashMap<>();
          valMap.put("distributorName", dis.getDistributorName());
          valMap.put("dept", dis.getDept());
          valMap.put("region", dis.getRegion());
          valMap.put("province", dis.getProvince());
          valMap.put("storeNum", dis.getStoreNum());
          List<StoreNewAddReportVO.dayData> dayDataList = dis.getDayDataList();
          Map<String, List<StoreNewAddReportVO.dayData>> collectMap = Maps.newHashMap();
          if (CollectionUtils.isNotEmpty(dayDataList)) {
            collectMap = dayDataList.stream().collect(Collectors.groupingBy(StoreNewAddReportVO.dayData::getDayStr));
          }
          List<Map<String, Object>> list_1 = new ArrayList<>();
          Map<String, Object> valMap_1 = new HashMap<>();
          for (int j = 1; j <= dayNum; j++) {
            List<StoreNewAddReportVO.dayData> dayData = collectMap.get(String.valueOf(j));
            int applyflag = 0;
            int adoptflag = 0;
            if (CollectionUtils.isNotEmpty(dayData)) {
              applyflag = dayData.get(0).getApplyNum();
              adoptflag = dayData.get(0).getAdoptNum();
            }
            valMap_1.put("applyNum" + j, applyflag);
            valMap_1.put("adoptNum" + j, adoptflag);
          }
          list_1.add(valMap_1);
          valMap.put("day", list_1);
          list.add(valMap);
        }
        //导出
        Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("【" + request.getMonthStr() + "】门店注册日明细数据", "数据"), colList, list);
        Sheet sheet = workbook.getSheet("数据");
        Row row = sheet.getRow(sheet.getLastRowNum());
        Cell cell = row.getCell(0);
        cell.setCellValue("总计");
        CellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setAlignment(HorizontalAlignment.CENTER);//水平居中
        cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);//垂直居中
        Font font = workbook.createFont();
        font.setFontHeightInPoints((short) 15);
        font.setFontName("Trebuchet MS");
        cellStyle.setFont(font);
        cell.setCellStyle(cellStyle);
        CellRangeAddress range_0 = new CellRangeAddress(sheet.getLastRowNum(), sheet.getLastRowNum(), 0, 3);
        sheet.addMergedRegion(range_0);
        File file = new File("D:\\".concat(UUID.randomUUID().toString().concat(".xls")));
		    FileOutputStream fileOutputStream = null;
		    try {
		      fileOutputStream = new FileOutputStream(file);
		      workbook.write(fileOutputStream);
		    } catch (Exception e) {
		      log.error("门店注册日workbook写入到文件中失败，错误信息：{}", ExceptionUtils.getStackTrace(e));
		    } finally {
		      if (null != fileOutputStream) {
		        try {
		          fileOutputStream.close();
		        } catch (IOException e) {
		          //skip
		        }
		      }
		    }

具体的API细节就不介绍了可以去官网，关键在于ExcelExportEntity 这个类，它是以map形式展现的，创建的时候设置key，设置value的根据key进行设置，上面一些StoreNewAddReportVO还有其他是我的业务类， 到时候可以替换掉。

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