这里用的是easypoi

首先引入jar包

<!-- excel -->
<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-base</artifactId>
    <version>${easypoi.version}</version>
</dependency>
<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-web</artifactId>
    <version>${easypoi.version}</version>
</dependency>
<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-annotation</artifactId>
    <version>${easypoi.version}</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>4.1.1</version>
</dependency>
2.业务代码
（1）service接口层代码

/**
 * 获取导出列表
 * @param jsonParam
 * @return
 * @throws Exception
 */
Map<String,Object> getDownloadAllStaffWorkers(JSONObject jsonParam )throws Exception;

（2）serviceImpl实现类代码
红色部分是因为要先把文件上传到服务器，然后后端获取，然后再返给前端一个URL。一般不用谢

@Override
public Map<String, Object> getDownloadAllStaffWorkers(JSONObject jsonParam) throws Exception {
    String workerName = jsonParam.getString("workerName");
    String workerCardNum = jsonParam.getString("workerCardNum");
    String workerPhone = jsonParam.getString("workerPhone");
    Long allStaffWorkerTypeId = jsonParam.getLong("allStaffWorkerTypeId");
    String workerCode = jsonParam.getString("workerCode");
    Long sysId = jsonParam.getLong("sysId");
    String clzName = "员工表";
    String sessionToken = jsonParam.getString("sessionToken");
    /*
     查询导出员工列表
     */
    Example example = new Example(AllStaffWorkers.class);
    Example.Criteria criteria = example.createCriteria();
    //是否有效：1.有效 2.无效
    criteria.andEqualTo("isEnabled", ConstantsConfig.IS_ENABLED_YES);
    //是否删除：1未删除 2.已删除
    criteria.andEqualTo("isDeleted",ConstantsConfig.IS_DELETED_NO);
    criteria.andEqualTo("sysId",sysId);
    if (!Strings.isNullOrEmpty("workerName")){
        criteria.andLike("workerName",workerName);
    }
    if (!Strings.isNullOrEmpty(workerCardNum)){
        criteria.andEqualTo("workerCardNum",workerCardNum);
    }
    if (!Strings.isNullOrEmpty(workerPhone)){
        criteria.andEqualTo("workerPhone",workerPhone);
    }
    if (!Strings.isNullOrEmpty(String.valueOf(allStaffWorkerTypeId))){
        criteria.andEqualTo("allStaffWorkerTypeId",allStaffWorkerTypeId);
    }
    if (!Strings.isNullOrEmpty(workerCode)){
        criteria.andEqualTo("workerCode",workerCode);
    }
    List<AllStaffWorkers> allStaffWorkersList = allStaffWorkersMapper.selectByExample(example);
    //导出数据
    HSSFWorkbook workbook = new HSSFWorkbook();
    //声明一个表格
    HSSFSheet sheet = workbook.createSheet("员工信息表");
    //设置表格的默认宽度
    sheet.setDefaultColumnWidth((short) 30);
    //需要导出的文件名字
    String fileName = clzName + ".xls";
    int rowNum = 1;
    //导出Excel 表格头部
    String [] headers = {"姓名","手机号","身份证号","性别","部门代码","归属部门","上级部门","人员类型","岗位/工种","状态"};
    HSSFRow row = sheet.createRow(0);
    //在Excel中添加表头
    for (int i = 0;i<headers.length;i++){
        HSSFCell cell = row.createCell(i);
        HSSFRichTextString text = new HSSFRichTextString(headers[i]);
        cell.setCellValue(text);
    }
    HSSFRow row1 = null;
    for (AllStaffWorkers allStaffWorkers : allStaffWorkersList){
        String workerSex = null;
        if (allStaffWorkers.getWorkerSex() == 1){
            workerSex = "男";
        }else if (allStaffWorkers.getWorkerSex() ==2){
            workerSex ="女";
        }else{
            workerSex = "";
        }
        row1 = sheet.createRow(rowNum);
        row1.createCell(0).setCellValue(allStaffWorkers.getWorkerName());
        row1.createCell(1).setCellValue(allStaffWorkers.getWorkerPhone());
        row1.createCell(2).setCellValue(allStaffWorkers.getWorkerCardNum());
        row1.createCell(3).setCellValue(workerSex);
        //组织管理表
        Long allStaffOrgId = allStaffWorkers.getAllStaffOrgId();
        AllStaffOrg allStaffOrg = new AllStaffOrg();
        allStaffOrg.setAllStaffOrgId(allStaffOrgId);
        allStaffOrg.setIsDeleted(ConstantsConfig.IS_DELETED_NO);
        allStaffOrg.setIsEnabled(ConstantsConfig.IS_ENABLED_YES);
        AllStaffOrg allStaffOrg1 = allStaffOrgMapper.selectOne(allStaffOrg);

        row1.createCell(4).setCellValue(allStaffOrg1.getOrgCode());
        row1.createCell(5).setCellValue(allStaffOrg1.getOrgName());
        row1.createCell(6).setCellValue(allStaffOrg1.getParentId());
        //工种表
        allStaffWorkerTypeId = allStaffWorkers.getAllStaffWorkerTypeId();
        if (allStaffWorkerTypeId != null){
            AllStaffWorkerType allStaffWorkerType = new AllStaffWorkerType();
            allStaffWorkerType.setAllStaffWorkerTypeId(allStaffWorkerTypeId);
            allStaffWorkerType.setIsDeleted(ConstantsConfig.IS_DELETED_NO);
            allStaffWorkerType.setIsEnabled(ConstantsConfig.IS_ENABLED_YES);
            AllStaffWorkerType allStaffWorkerType1 = allStaffWorkerTypeMapper.selectOne(allStaffWorkerType);
            row1.createCell(7).setCellValue(allStaffWorkerType1.getWorkerTypeName());
            row1.createCell(8).setCellValue(allStaffWorkerType1.getWorkerTypeName());
        }else {
            continue;
        }
        //字典表
        Long dictId = allStaffWorkers.getDictCommId();
        if (dictId  != null){
            DictComm dictComm = new DictComm();
            dictComm.setDictId(dictId);
            dictComm.setIsDeleted(ConstantsConfig.IS_DELETED_NO);
            dictComm.setIsEnabled(ConstantsConfig.IS_ENABLED_YES);
            DictComm dictComm1 = dictCommMapper.selectOne(dictComm);
            row1.createCell(9).setCellValue(dictComm1.getDictName());
            rowNum++;
        }else {
            continue;
        }
    }
    /*byte[] fileByte = workbook.getBytes();*/
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    workbook.write(os);
    os.toByteArray();

    workbook.close();
    String httpUrl = null;
    String filePath = null;
    String url = null;
    try {
        url = FastDFSUtils.getDoUpload(sessionToken,fileName,os.toByteArray());
    }catch (Exception e){
        errLog("getDownloadAllStaffWorkers",ErrorCodeMsg.UNKNOWN_ERROR.getMessage(),"获取文件服务下载地址为空");
        throw new AttemptException(ErrorCodeMsg.UNKNOWN_ERROR,"获取文件服务下载地址为空");
    }
    if (StringUtils.isNotEmpty(url)) {
        JSONObject jsonObject = JSONObject.parseObject(url);
        String data = jsonObject.getString("data");
        JSONObject dataObject = JSONObject.parseObject(data);
        httpUrl = dataObject.getString("httpUrl");
        filePath = dataObject.getString("filePath");
        if (StringUtils.isEmpty(filePath)) {
            errLog("getDownloadTrainStuEnroll", ErrorCodeMsg.UNKNOWN_ERROR.getMessage(), "获取文件服务下载地址为空2");
            throw new AttemptException(ErrorCodeMsg.UNKNOWN_ERROR, "获取文件服务下载地址为空2");
        }
    }
    System.out.println(url);
    Map<String,Object> map = new HashMap<>();
    map.put("url",fileServer + "/" + filePath);
    map.put("attname",fileName);
    return map;
}
（3）Controller层代码

/**
 * 下载员工
 * @param request
 * @param jsonParam
 * @param requestUser
 * @return
 * @throws Exception
 */
@PostMapping("/getDownloadAllStaffWorkers")
public ResponseStruct getDownloadAllStaffWorkers(HttpServletRequest request,@RequestBody JSONObject jsonParam,@ModelAttribute RequestUser requestUser)throws Exception{
    Long sysId = requestUser.getSysid();
    String sessionToken = request.getHeader(ConstantsConfig.ACCESS_TOKEN_KEY);
    jsonParam.put("sysId",sysId);
    jsonParam.put("sessionToken",sessionToken);
    Map<String,Object> map = allStaffWorkersInterface.getDownloadAllStaffWorkers(jsonParam);
    return ResponseStruct.success(map);
}

注：因为前端框架是vue架构师考虑到整体文件的管理，所以这里面都要先把文件上传到fastdns服务器然后再进行处理。之前写过简单的。喜欢的点个赞谢谢！