Easypoi导出excel

简单excel导出
第一步：导入依赖

  <dependency><groupId>cn.afterturn</groupId><artifactId>easypoi-spring-boot-starter</artifactId><version>4.2.0</version></dependency>

第二部：构建导出excel实体类

@Data
@ExcelTarget("alarmTrendExcel")
public class AlarmStatisticsDto {/*** 时间*/@Excel(name = "时间",width = 30,needMerge = true)private String warningTime;/*** 报警数量*/@Excel(name = "报警量",width = 30,needMerge = true)private int warningCount;
}
@Data
@NoArgsConstructor
@AllArgsConstructor
@ExcelTarget("alarmPositionExcel")
public class AlarmPositionDto {/*** 所属地区编码*/private String deviceAreaCode;/*** 所属地区名*/@Excel(name = "所属区域",width = 30,needMerge = true)private String deviceArea;/*** 报警数量*/@Excel(name = "报警量",width = 30,needMerge = true)private int warningCount;/*** 开始时间*/@Excel(name = "开始时间",width = 30,needMerge = true)private String startTime;/*** 结束时间*/@Excel(name = "结束时间",width = 30,needMerge = true)private String endTime;
}
@Data
@NoArgsConstructor
@AllArgsConstructor
@ExcelTarget("bizProportionDto")
public class BizProportionDto {/*** 业务名对应code值*/private String pcode;/*** 业务名*/@Excel(name = "业务名称",width = 30,needMerge = true)private String name;/*** 数量*/@Excel(name = "报警次数",width = 30,needMerge = true)private int warningCount;/*** 占比*/@Excel(name = "占比",width = 30,needMerge = true)private String proportion;/*** 开始时间*/@Excel(name = "开始时间",width = 30,needMerge = true)private String startTime;/*** 结束时间*/@Excel(name = "结束时间",width = 30,needMerge = true)private String endTime;
}
@Data
@NoArgsConstructor
@AllArgsConstructor
@ExcelTarget("deviceProportionDto")
public class DeviceProportionDto {/*** 设备名code*/private String pcode;/*** 设备名*/@Excel(name = "设备名称",width = 30,needMerge = true)private String name;/*** 数量*/@Excel(name = "报警次数",width = 30,needMerge = true)private int warningCount;/*** 占比*/@Excel(name = "占比",width = 30,needMerge = true)private String proportion;/*** 开始时间*/@Excel(name = "开始时间",width = 30,needMerge = true)private String startTime;/*** 结束时间*/@Excel(name = "结束时间",width = 30,needMerge = true)private String endTime;
}

第三步：导出

 public ApiResponse export(AlarmStatisticsVo alarmStatisticsVo, HttpServletResponse response) throws ClassNotFoundException {Workbook workBook = null;// 将sheet1、sheet2、sheet3使用得map进行包装List<Map<String, Object>> sheetsList = new ArrayList<>();//sheet1List<AlarmStatisticsDto> alarmTrendData = alarmStatisticsService.getAlarmTrendExcelData(alarmStatisticsVo);Map<String, Object> trendSheet = EasyPoiSheetCreaterUtil.getSheet(AlarmStatisticsDto.class,alarmTrendData, "sheet1");sheetsList.add(trendSheet);//sheet2List<AlarmPositionDto> alarmPositionDtos = alarmStatisticsService.getAlarmExcelPositions(alarmStatisticsVo);Map<String, Object> positionSheet = EasyPoiSheetCreaterUtil.getSheet(AlarmPositionDto.class,alarmPositionDtos, "sheet2");sheetsList.add(positionSheet);//sheet3List<DeviceProportionDto> deviceProportionDtos = alarmStatisticsService.getAlarmDeviceExcelData(alarmStatisticsVo);Map<String, Object> deviceSheet = EasyPoiSheetCreaterUtil.getSheet(DeviceProportionDto.class,deviceProportionDtos, "sheet3");sheetsList.add(deviceSheet);//sheet4List<BizProportionDto> bizProportionDtos = alarmStatisticsService.getAlarmBizExcelData(alarmStatisticsVo);Map<String, Object> bizSheet = EasyPoiSheetCreaterUtil.getSheet(BizProportionDto.class,bizProportionDtos, "sheet4");sheetsList.add(bizSheet);workBook = ExcelExportUtil.exportExcel(sheetsList, ExcelType.HSSF);// 设置excel的文件名称String excelName;// 当前日期，用于导出文件名称SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");Integer linkId = alarmStatisticsVo.getLinkId();if (ObjectUtils.isEmpty(linkId)){excelName = "文件名" + "-" + sdf.format(new Date());}else {Link linkDetailsById = linkService.getLinkDetailsById(linkId);excelName= linkDetailsById.getLinkName() + "-" + sdf.format(new Date());}// 重置响应对象response.reset();// 指定下载的文件名--设置响应头response.setHeader("Content-Disposition", "attachment;filename=" + new String((excelName + ".xls").getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1));response.setContentType("application/vnd.ms-excel;charset=UTF-8");response.setHeader("Pragma", "no-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0);// 写出数据输出流到页面try {OutputStream output = response.getOutputStream();BufferedOutputStream bufferedOutPut = new BufferedOutputStream(output);workBook.write(bufferedOutPut);bufferedOutPut.flush();bufferedOutPut.close();output.close();} catch (IOException e) {e.printStackTrace();}return “success”;}

构建sheet 工具抽取

public class EasyPoiSheetCreaterUtil {/*** easypoi导出excel构建sheet** @param object  导出实体的类* @param recordList  导出数据list* @param sheetName sheet名称* @return* @throws ClassNotFoundException*/public static Map<String, Object> getSheet(Object object, List<? extends Object> recordList, String sheetName) throws ClassNotFoundException {// 创建sheet1使用得mapMap<String, Object> exportMap = new HashMap<>();// 创建参数对象（用来设定excel得sheet得内容等信息）ExportParams exportParams = new ExportParams();// 设置sheet得名称exportParams.setSheetName(sheetName);// title的参数为ExportParams类型，目前仅仅在ExportParams中设置了sheetNameexportMap.put("title", exportParams);// 模版导出对应得实体类型exportMap.put("entity", Class.forName(((Class) object).getCanonicalName()));// sheet中要填充得数据exportMap.put("data", recordList);// 执行方法return exportMap;}
}

复杂一点的导出：没做，看了一下这篇，挺不错的https://blog.csdn.net/weixin_36380516/article/details/108426874

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