EasyExcel简单使用

之前一直用的Apache POI来做数据的导入导出，但听说阿里的EasyExcel也拥有POI的功能的同时，在处理大数据量的导入导出的时候性能上比POI更好，所以就来尝试使用一下

导入Maven依赖：

<dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.2.1</version> <!-- 请检查并使用最新稳定版本 -->
</dependency>

导出数据功能

导出模型类

定义一个导出数据模型类，用于设置excel文件的格式，通过注解的方式可以定义excel中的格式
@ColumnWidth(20) 设置excel中列的宽度为20；

@HeadStyle(horizontalAlignment = HorizontalAlignmentEnum.CENTER) 设置文本内容是否居中；

@HeadFontStyle(bold = BooleanEnum.FALSE) 设置字体是否加粗；

@ExcelProperty(value = “电话”, index = 0) 设置了excel中的标题，value则是标题内容，index则是内容所在的列的位置

@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
@ColumnWidth(20)
@HeadStyle(horizontalAlignment = HorizontalAlignmentEnum.CENTER)
@HeadFontStyle(bold = BooleanEnum.FALSE)
public class PmembersExportVO {@ColumnWidth(15)@ExcelProperty(value = "电话", index = 0)private String mobile;@ColumnWidth(15)@ExcelProperty(value = "姓名", index = 1)private String realname;@ColumnWidth(10)@ExcelProperty(value = "性别", index = 2)private String gender;@ColumnWidth(10)@ExcelProperty(value = "省份", index = 3)private String resideprovince;@ColumnWidth(10)@ExcelProperty(value = "城市", index = 4)private String residecity;@ColumnWidth(10)@ExcelProperty(value = "区/县", index = 5)private String residedist;@ColumnWidth(20)@ExcelProperty(value = "地址", index = 6)private String address;@ColumnWidth(12)@ExcelProperty(value = "公历生日", index = 7)private String birth;@ColumnWidth(12)@ExcelProperty(value = "农历生日", index = 8)private String yinlibirth;@ColumnWidth(12)@ExcelProperty(value = "是否闰月", index = 9)private String isLeapMonth;}

controller代码

    @ApiOperation("导出居士信息")@ApiImplicitParams({@ApiImplicitParam(name = "weiqingview_backend_token", value = "token", required = true, dataType = "String", paramType = "header"),@ApiImplicitParam(name = "uniacid", value = "Unicid", required = true, dataType = "Integer", paramType = "query")})@GetMapping("/export")public void export(@RequestParam Map<String, Object> params, HttpServletResponse response) {mcMembersService.exportExcel(params, response);}

service代码

通过查询数据库中的数据，并封装到List集合中，调用EasyExcel的write方法即可将集合中的数据写入生成excel文件供下载

public void export(Map<String, Object> params, HttpServletResponse response) {Integer uniacid = Integer.valueOf(params.get("uniacid").toString());List<McMembers> mcMembersList = this.list(new QueryWrapper<McMembers>().eq("isBeliever", 1).eq("uniacid", uniacid));List<PmembersExportVO> pmembersExportVOList = mcMembersList.stream().map(m -> {PmembersExportVO pmembersExportVO = new PmembersExportVO();pmembersExportVO.setAddress(m.getAddress());pmembersExportVO.setMobile(m.getMobile());pmembersExportVO.setGender(ObjectUtils.isEmpty(m.getGender()) ? "" : m.getGender().equals(0) ? "女" : "男");pmembersExportVO.setBirth(m.getBirth());pmembersExportVO.setYinlibirth(m.getYinlibirth());pmembersExportVO.setRealname(m.getRealname());pmembersExportVO.setResidedist(m.getResidedist());pmembersExportVO.setResidecity(m.getResidecity());pmembersExportVO.setResideprovince(m.getResideprovince());pmembersExportVO.setIsLeapMonth(ObjectUtils.isEmpty(m.getIsLeapMonth()) ? "否" : m.getIsLeapMonth() == 1 ? "是" : "否");return pmembersExportVO;}).collect(Collectors.toList());//        // 导出Excel
//        EasyExcel.write("居士信息数据.xls", PmembersExportVO.class)
                .head(headersList) // 设置表头
//                .sheet("用户信息")
//                .doWrite(pmembersExportVOList);// 设置响应头response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");response.setCharacterEncoding("utf-8");String fileName = null;try {fileName = URLEncoder.encode("居士信息数据.xlsx", "UTF-8");response.setHeader("Content-Disposition", "attachment;filename=" + fileName);EasyExcel.write(response.getOutputStream(), PmembersExportVO.class).sheet("用户信息").doWrite(pmembersExportVOList);} catch (UnsupportedEncodingException e) {log.error("导出居士信息报错 UnsupportedEncodingException:{}", e);} catch (IOException e) {log.error("导出居士信息报错 IOException:{}", e);}}

导入数据功能：

导入数据模型类

我这里用的跟导出数据类基本一致，所以也就改了个类名

只要用@ExcelProperty指定对应列的信息就行，其他指定格式的注解其实可以忽略

@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
@ColumnWidth(20)
@HeadStyle(horizontalAlignment = HorizontalAlignmentEnum.CENTER)
@HeadFontStyle(bold = BooleanEnum.FALSE)
public class ImportPmcMembersDTO {@ColumnWidth(15)@ExcelProperty(value = "电话", index = 0)private String mobile;@ColumnWidth(15)@ExcelProperty(value = "姓名", index = 1)private String realname;@ColumnWidth(10)@ExcelProperty(value = "性别", index = 2)private String gender;@ColumnWidth(10)@ExcelProperty(value = "省份", index = 3)private String resideprovince;@ColumnWidth(10)@ExcelProperty(value = "城市", index = 4)private String residecity;@ColumnWidth(10)@ExcelProperty(value = "区/县", index = 5)private String residedist;@ColumnWidth(20)@ExcelProperty(value = "地址", index = 6)private String address;@ColumnWidth(12)@ExcelProperty(value = "公历生日", index = 7)private String birth;@ColumnWidth(12)@ExcelProperty(value = "农历生日", index = 8)private String yinlibirth;@ColumnWidth(12)@ExcelProperty(value = "是否闰月", index = 9)private String isLeapMonth;}

controller代码

前端页面上传一个name是file的文件

    @ApiOperation("导入居士信息")@ApiImplicitParams({@ApiImplicitParam(name = "weiqingview_backend_token", value = "token", required = true, dataType = "String", paramType = "header"),@ApiImplicitParam(name = "uniacid", value = "Unicid", required = true, dataType = "Integer", paramType = "query"),@ApiImplicitParam(name = "file", value = "file", required = true, dataType = "MultipartFile", paramType = "query")})@PostMapping("/uploadExcel")public R uploadExcel(@RequestParam("file") MultipartFile file, @RequestParam Map<String, Object> params) {return mcMembersService.importExcel(file, params);}

service代码

下面是接收controller传来的文件后，通过调用EasyExcel的read方法，直接进行导入操作

    public R importExcel(MultipartFile file, Map<String, Object> params) {// 检查文件是否为空if (file.isEmpty()) {return R.error("没有检测到文件"); // 返回错误页面}try {// 执行导入操作EasyExcel.read(file.getInputStream(), ImportPmcMembersDTO.class, new ImportPmcMembersListener(this, params)).sheet().doRead();// 返回上传成功页面return R.ok("导入excel成功");} catch (IOException e) {e.printStackTrace();return R.error("导入excel失败");}}

下面是service中基本的添加数据的操作方法，导入数据插库的时候也直接调用，就不写新的插库方法了

public R pAdd(AddPmcMembersDTO addPmcMembersDTO, Map<String, Object> params) {McMembers mcMembers = new McMembers();BeanUtils.copyProperties(addPmcMembersDTO, mcMembers);mcMembers.setIsBeliever((byte) 1);Integer uniacid = Integer.parseInt(params.get("uniacid").toString());mcMembers.setUniacid(uniacid);if (this.save(mcMembers)) {return R.ok("添加成功");}return R.error("添加失败");}

listener代码

上传的话需要定义一个listener，并继承AnalysisEventListener，这里的T类型就是上面定义的模型类的类型。

如果是在listener中进行插库操作，那需要把service注入进来，但是在listener中不能用@Autowired，所以重写一个带参的构造方法，把注入好的service直接传进来使用即可，我下面将注入好的mcMembersService传递了进来，执行插库操作。下面的AddPmcMembersDTO是我另外定义的一个模型类，是用于界面上添加数据用的，这里直接转换后调用进行插库操作了。

当然也可以在listener中先将excel中的数据都封装到List集合中，再统一将List中的数据插库也行。

public class ImportPmcMembersListener extends AnalysisEventListener<ImportPmcMembersDTO> {private McMembersService mcMembersService;private Map<String, Object> params;//通过构造方法，得到注入好的mcMembersServicepublic ImportPmcMembersListener(McMembersService mcMembersService, Map<String, Object> params) {this.mcMembersService = mcMembersService;this.params = params;}@Overridepublic void invoke(ImportPmcMembersDTO data, AnalysisContext context) {// 处理读取到的每行数据，例如保存到数据库System.out.println("读取到一行数据: " + data.toString());// 这里可以添加保存到数据库的逻辑AddPmcMembersDTO addPmcMembersDTO = new AddPmcMembersDTO();addPmcMembersDTO.setMobile(data.getMobile());addPmcMembersDTO.setRealname(data.getRealname());addPmcMembersDTO.setGender((byte) (ObjectUtils.isEmpty(data.getGender()) ? 0 : data.getGender().equals("男") ? 1 : 2));addPmcMembersDTO.setAddress(data.getAddress());addPmcMembersDTO.setBirth(data.getBirth());addPmcMembersDTO.setYinlibirth(data.getYinlibirth());addPmcMembersDTO.setResidedist(data.getResidedist());addPmcMembersDTO.setResidecity(data.getResidecity());addPmcMembersDTO.setResideprovince(data.getResideprovince());addPmcMembersDTO.setIsLeapMonth((byte) (ObjectUtils.isEmpty(data.getIsLeapMonth()) ? 0 : data.getIsLeapMonth().equals("是") ? 1 : 0));// 进行插库操作mcMembersService.pAdd(addPmcMembersDTO, params);}@Overridepublic void doAfterAllAnalysed(AnalysisContext context) {// 所有数据解析完毕后的回调System.out.println("所有数据解析完成");}