Java导出Excel并合并单元格-编程知识

需求：需要在导出excel时合并指定的单元格

ruoyi excel

项目基于若伊框架二次开发，本着能用现成的就不自己写的原则，先是尝试了@Excel注解中needMerge属性

     /*** 是否需要纵向合并单元格,应对需求:含有list集合单元格)*/public boolean needMerge() default false;

查了一圈别人的使用，大致是需要定义一个List集合，集合元素为对象，对象中的属性标注@Excel注解，并表明name属性

照葫芦画瓢

@Getter
@Setter
@ToString
public class CutterControlVO {/** 主键 */private Long id;/** 工厂编码 */@Excel(name = "工厂编码",needMerge = true)private String factoryCode;/** 产线编码 */@Excel(name = "产线编码",needMerge = true)private String productionLineCode;/** 设备编号 */@Excel(name = "设备编号",needMerge = true)private String deviceNumber;/** 设备名称 */@Excel(name = "设备名称",needMerge = true)private String deviceName;@Excel(name = "检测刀具编码",needMerge = true)private String cutterCode;/** 换刀时间 */@JsonFormat(timezone="GMT+8", pattern="yyyy-MM-dd HH:mm:ss")@DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss")@Excel(name = "换刀时间",dateFormat = "yyyy-MM-dd HH:mm:ss",needMerge = true)private Date cutterChangeTime;/** 上刀数 */@Excel(name = "上刀数",needMerge = true)private Integer upperKnifeNumber;/** 下刀数 */@Excel(name = "下刀数",needMerge = true)private Integer lowerKnifeNumber;@Excel(name = "更换人员",needMerge = true)private String modifyUser;/** 备注 */@Excel(name = "备注",needMerge = true)private String remark;@Excel(name = "换刀位置")private List<CutterVO> cutterChangePosition;@Excel(name = "累计分切米数")private List<CutterVO> accumulatedCuttingMeters;}

@Getter
@Setter
@ToString
public class CutterVO {@Excel(name = "上刀左")private Integer upperKnifeLeft;@Excel(name = "上刀中")private Integer upperKnifeCenter;@Excel(name = "上刀右")private Integer upperKnifeRight;@Excel(name = "下刀左")private Integer lowerKnifeLeft;@Excel(name = "下刀中")private Integer lowerKnifeCenter;@Excel(name = "下刀右")private Integer lowerKnifeRight;
}

@PostMapping("/export")
public void export(HttpServletResponse response) throws Exception{List<CutterControl> cutterControlList = cutterControlService.getCutterControlList();//设置导出的数据表格式List<CutterControlVO> cutterControlVOList = new ArrayList<>();CutterControlVO cutterControlVO = null;for (CutterControl cutterControl : cutterControlList) {cutterControlVO = new CutterControlVO();CutterVO cutterPosition = new CutterVO();cutterPosition.setUpperKnifeLeft(cutterControl.getCutterChangePositionUpperKnifeLeft());cutterPosition.setUpperKnifeCenter(cutterControl.getCutterChangePositionUpperKnifeCenter());cutterPosition.setUpperKnifeRight(cutterControl.getCutterChangePositionUpperKnifeRight());cutterPosition.setLowerKnifeLeft(cutterControl.getCutterChangePositionLowerKnifeLeft());cutterPosition.setLowerKnifeCenter(cutterControl.getCutterChangePositionLowerKnifeCenter());cutterPosition.setLowerKnifeRight(cutterControl.getCutterChangePositionLowerKnifeRight());CutterVO accumulatedCuttingMeters = new CutterVO();accumulatedCuttingMeters.setUpperKnifeLeft(cutterControl.getAccumulatedCuttingMetersUpperKnifeLeft());accumulatedCuttingMeters.setUpperKnifeCenter(cutterControl.getAccumulatedCuttingMetersUpperKnifeCenter());accumulatedCuttingMeters.setUpperKnifeRight(cutterControl.getAccumulatedCuttingMetersUpperKnifeRight());accumulatedCuttingMeters.setLowerKnifeLeft(cutterControl.getAccumulatedCuttingMetersLowerKnifeLeft());accumulatedCuttingMeters.setLowerKnifeCenter(cutterControl.getAccumulatedCuttingMetersLowerKnifeCenter());accumulatedCuttingMeters.setLowerKnifeRight(cutterControl.getAccumulatedCuttingMetersLowerKnifeRight());BeanUtils.copyProperties(cutterControl,cutterControlVO);cutterControlVO.setCutterChangePosition(Arrays.asList(cutterPosition));cutterControlVO.setAccumulatedCuttingMeters(Arrays.asList(accumulatedCuttingMeters));cutterControlVOList.add(cutterControlVO);}ExcelUtil<CutterControlVO> util = new ExcelUtil<CutterControlVO>(CutterControlVO.class);util.exportExcel(response,cutterControlVOList,"切刀管控台账数据");
}

查看导出效果：

黑人问号脸？

突然想到别人都是采用的是一个List集合，于是我注释了一个List，此时效果如下：

可以看到，一个List效果是正常显示的，数据获取和显示也是正常的。

若伊使用的Excel导出工具类底层采用apache poi ，只能导出简单的excel表格，涉及复杂excel表格或者需要自定义表格时就比较难操作

使用阿里的easyExcel来实现复杂excel表格的导出

easyExcel

首先引入POM依赖

    <dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>2.2.7</version></dependency>

1、不合并单元格的写法

实体类

@Getter
@Setter
public class CutterControl {/** 主键 */@ExcelIgnoreprivate Long id;/** 工厂编码 */@ExcelProperty(value = "工厂编码")private String factoryCode;/** 产线编码 */@ExcelProperty(value = "产线编码")private String productionLineCode;/** 设备编号 */@ExcelProperty(value = "设备编号")private String deviceNumber;/** 设备名称 */@ExcelProperty(value = "设备名称")private String deviceName;@ExcelProperty(value = "检测刀具编码")private String cutterCode;@ExcelProperty(value = "上刀左")private Integer cutterChangePositionUpperKnifeLeft;@ExcelProperty(value = "上刀中")private Integer cutterChangePositionUpperKnifeCenter;@ExcelProperty(value = "上刀右")private Integer cutterChangePositionUpperKnifeRight;@ExcelProperty(value = "下刀左")private Integer cutterChangePositionLowerKnifeLeft;@ExcelProperty(value = "下刀中")private Integer cutterChangePositionLowerKnifeCenter;@ExcelProperty(value = "下刀右")private Integer cutterChangePositionLowerKnifeRight;@ExcelProperty(value = "上刀左")private Integer accumulatedCuttingMetersUpperKnifeLeft;@ExcelProperty(value = "上刀中")private Integer accumulatedCuttingMetersUpperKnifeCenter;@ExcelProperty(value = "上刀右")private Integer accumulatedCuttingMetersUpperKnifeRight;@ExcelProperty(value = "下刀左")private Integer accumulatedCuttingMetersLowerKnifeLeft;@ExcelProperty(value = "下刀中")private Integer accumulatedCuttingMetersLowerKnifeCenter;@ExcelProperty(value = "下刀右")private Integer accumulatedCuttingMetersLowerKnifeRight;/** 换刀时间 */@JsonFormat(timezone="GMT+8", pattern="yyyy-MM-dd HH:mm:ss")@DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss")@ExcelProperty(value = "换刀时间")@ColumnWidth(20)private Date cutterChangeTime;/** 上刀数 */@ExcelProperty(value = "上刀数")private Integer upperKnifeNumber;/** 下刀数 */@ExcelProperty(value = "下刀数")private Integer lowerKnifeNumber;@ExcelProperty(value = "更换人员")private String modifyUser;/** 备注 */@ExcelProperty(value = "备注")private String remark;}

@ExcelIgnore ：设置表格忽略该属性

@ColumnWidth(20)：设置列宽

controller代码

  @PostMapping("/export")public void export(HttpServletResponse response) throws Exception{List<CutterControl> cutterControlList = cutterControlService.getCutterControlList();String fileName = System.getProperty("user.dir") + "/" + System.currentTimeMillis() + ".xlsx";// 构建ExcelWriterExcelWriter excelWriter = EasyExcel.write(fileName).excelType(ExcelTypeEnum.XLSX).build();// 构建sheetWriteSheet writeSheet = EasyExcel.writerSheet("切刀管控台账数据").head(CutterControl.class).build();// 写sheetexcelWriter.write(cutterControlList, writeSheet);excelWriter.finish();}

结果：

2、自定义列合并策略

参考eastExcel文档可知，在实体类上添加属性即可实现我想要的效果

写Excel | Easy Excel

@Getter
@Setter
@EqualsAndHashCode
public class ComplexHeadData {@ExcelProperty({"主标题", "字符串标题"})private String string;@ExcelProperty({"主标题", "日期标题"})private Date date;@ExcelProperty({"主标题", "数字标题"})private Double doubleData;
}

再次照葫芦画瓢

@Getter
@Setter
public class CutterControl {/** 主键 */@ExcelIgnoreprivate Long id;/** 工厂编码 */@ExcelProperty(value = "工厂编码")private String factoryCode;/** 产线编码 */@ExcelProperty(value = "产线编码")private String productionLineCode;/** 设备编号 */@ExcelProperty(value = "设备编号")private String deviceNumber;/** 设备名称 */@ExcelProperty(value = "设备名称")private String deviceName;@ExcelProperty(value = "检测刀具编码")private String cutterCode;@ExcelProperty({"换刀位置", "上刀左"})private Integer cutterChangePositionUpperKnifeLeft;@ExcelProperty({"换刀位置", "上刀中"})private Integer cutterChangePositionUpperKnifeCenter;@ExcelProperty({"换刀位置", "上刀右"})private Integer cutterChangePositionUpperKnifeRight;@ExcelProperty({"换刀位置", "下刀左"})private Integer cutterChangePositionLowerKnifeLeft;@ExcelProperty({"换刀位置", "下刀中"})private Integer cutterChangePositionLowerKnifeCenter;@ExcelProperty({"换刀位置", "下刀右"})private Integer cutterChangePositionLowerKnifeRight;@ExcelProperty({"累计分切米数", "上刀左"})private Integer accumulatedCuttingMetersUpperKnifeLeft;@ExcelProperty({"累计分切米数", "上刀中"})private Integer accumulatedCuttingMetersUpperKnifeCenter;@ExcelProperty({"累计分切米数", "上刀右"})private Integer accumulatedCuttingMetersUpperKnifeRight;@ExcelProperty({"累计分切米数", "下刀左"})private Integer accumulatedCuttingMetersLowerKnifeLeft;@ExcelProperty({"累计分切米数", "下刀中"})private Integer accumulatedCuttingMetersLowerKnifeCenter;@ExcelProperty({"累计分切米数", "下刀右"})private Integer accumulatedCuttingMetersLowerKnifeRight;/** 换刀时间 */@JsonFormat(timezone="GMT+8", pattern="yyyy-MM-dd HH:mm:ss")@DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss")@ExcelProperty(value = "换刀时间")@ColumnWidth(20)private Date cutterChangeTime;/** 上刀数 */@ExcelProperty(value = "上刀数")private Integer upperKnifeNumber;/** 下刀数 */@ExcelProperty(value = "下刀数")private Integer lowerKnifeNumber;@ExcelProperty(value = "更换人员")private String modifyUser;/** 备注 */@ExcelProperty(value = "备注")private String remark;}

其余不用修改

效果如下：

若需要导出excel在浏览器，修改Controller代码如下：

 @GetMapping("/export")public void export(HttpServletResponse response) throws Exception{List<CutterControl> cutterControlList = cutterControlService.getCutterControlList();String fileName = new String("切刀管控台账数据.xlsx");fileName = URLEncoder.encode(fileName, "UTF-8");response.setContentType("application/vnd.ms-excel");response.setCharacterEncoding("utf8");response.setHeader("Content-disposition", "attachment;filename=" + fileName );EasyExcel.write(response.getOutputStream(),CutterControl.class).sheet("切刀管控台账数据").doWrite(cutterControlList);}

3、自定义行合并策略

具体业务暂时用不到，需要的可参考这个博客

https://www.cnblogs.com/monianxd/p/16359369.html

导入excel并处理同名列

由于实体类中存在excel列名重复的情况，所以如果不进行处理，会出现只有一个有值的情况，最简单的处理方式如下：

同名列添加所在位置的索引，默认从0开始

@Getter
@Setter
public class CutterControl {/** 主键 */@ExcelIgnoreprivate Long id;/** 工厂编码 */@ExcelProperty(value = "工厂编码")private String factoryCode;/** 产线编码 */@ExcelProperty(value = "产线编码")private String productionLineCode;/** 设备编号 */@ExcelProperty(value = "设备编号")private String deviceNumber;/** 设备名称 */@ExcelProperty(value = "设备名称")private String deviceName;@ExcelProperty(value = "检测刀具编码")private String cutterCode;@ExcelProperty(value = {"换刀位置", "上刀左"},index = 5)private Integer cutterChangePositionUpperKnifeLeft;@ExcelProperty(value = {"换刀位置", "上刀中"},index = 6)private Integer cutterChangePositionUpperKnifeCenter;@ExcelProperty(value = {"换刀位置", "上刀右"},index = 7)private Integer cutterChangePositionUpperKnifeRight;@ExcelProperty(value = {"换刀位置", "下刀左"},index = 8)private Integer cutterChangePositionLowerKnifeLeft;@ExcelProperty(value = {"换刀位置", "下刀中"},index = 9)private Integer cutterChangePositionLowerKnifeCenter;@ExcelProperty(value = {"换刀位置", "下刀右"},index = 10)private Integer cutterChangePositionLowerKnifeRight;@ExcelProperty(value = {"累计分切米数", "上刀左"},index = 11)private Integer accumulatedCuttingMetersUpperKnifeLeft;@ExcelProperty(value = {"累计分切米数", "上刀中"},index = 12)private Integer accumulatedCuttingMetersUpperKnifeCenter;@ExcelProperty(value = {"累计分切米数", "上刀右"},index = 13)private Integer accumulatedCuttingMetersUpperKnifeRight;@ExcelProperty(value = {"累计分切米数", "下刀左"},index = 14)private Integer accumulatedCuttingMetersLowerKnifeLeft;@ExcelProperty(value = {"累计分切米数", "下刀中"},index = 15)private Integer accumulatedCuttingMetersLowerKnifeCenter;@ExcelProperty(value = {"累计分切米数", "下刀右"},index = 16)private Integer accumulatedCuttingMetersLowerKnifeRight;/** 换刀时间 */@JsonFormat(timezone="GMT+8", pattern="yyyy-MM-dd HH:mm:ss")@DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss")@ExcelProperty(value = "换刀时间")@ColumnWidth(20)private Date cutterChangeTime;/** 上刀数 */@ExcelProperty(value = "上刀数")private Integer upperKnifeNumber;/** 下刀数 */@ExcelProperty(value = "下刀数")private Integer lowerKnifeNumber;@ExcelProperty(value = "更换人员")private String modifyUser;/** 备注 */@ExcelProperty(value = "备注")private String remark;}

导入Controller代码

@PostMapping("/import")public R importData(@RequestParam(value = "file") MultipartFile file) throws IOException {String fileName = file.getOriginalFilename();String suffixName = fileName.substring(fileName.lastIndexOf("."));if (!(suffixName.equals(".xlsx"))) {return R.fail("请上传xlsx格式文件");}EasyExcel.read(file.getInputStream(), CutterControl.class, new ReadListener<CutterControl>() {/*** 单次缓存的数据量*/public static final int BATCH_COUNT = 100;/***临时存储*/private List<CutterControl> cachedDataList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);@Overridepublic void invoke(CutterControl data, AnalysisContext context) {cachedDataList.add(data);if (cachedDataList.size() >= BATCH_COUNT) {saveData();// 存储完成清理 listcachedDataList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);}}@Overridepublic void doAfterAllAnalysed(AnalysisContext context) {saveData();}/*** 加上存储数据库*/private void saveData() {cutterControlService.batchInsertCutterControl(cachedDataList);log.info("{}条数据，开始存储数据库！", cachedDataList.size());log.info("存储数据库成功！");}}).sheet().doRead();return R.ok();}