1. 实体类字段上加 @Excel(name = "xxx"), 表示要导入的字段

    @Excel(name = "用户名称")private String nickName;

2. controller (post请求)

    /*** 导入用户数据** @param file  文件* @param updateSupport  是否更新支持，如果已存在，则进行更新数据* @return 结果*/@ApiOperation("导入用户数据")@PostMapping("/importData")public AjaxResult importData(MultipartFile file, boolean updateSupport) throws Exception{ExcelUtil<SysUser> util = new ExcelUtil<SysUser>(SysUser.class);List<SysUser> userList = util.importExcel(file.getInputStream());String operName = getUsername();String message = userService.importUser(userList, updateSupport, operName);return AjaxResult.success(message);}

3. service

    /*** 导入用户数据* * @param userList 用户数据列表* @param isUpdateSupport 是否更新支持，如果已存在，则进行更新数据* @param operName 操作用户* @return 结果*/@Overridepublic String importUser(List<SysUser> userList, Boolean isUpdateSupport, String operName){if (StringUtils.isNull(userList) || userList.size() == 0){throw new ServiceException("导入用户数据不能为空！");}int successNum = 0;int failureNum = 0;StringBuilder successMsg = new StringBuilder();StringBuilder failureMsg = new StringBuilder();String password = configService.selectConfigByKey("sys.user.initPassword");for (SysUser user : userList){try{// 验证是否存在这个用户SysUser u = userMapper.selectUserByUserName(user.getUserName());if (StringUtils.isNull(u)){BeanValidators.validateWithException(validator, user);user.setPassword(SecurityUtils.encryptPassword(password));user.setCreateBy(operName);this.insertUser(user);successNum++;successMsg.append("<br/>" + successNum + "、账号 " + user.getUserName() + " 导入成功");}else if (isUpdateSupport){BeanValidators.validateWithException(validator, user);user.setUpdateBy(operName);this.updateUser(user);successNum++;successMsg.append("<br/>" + successNum + "、账号 " + user.getUserName() + " 更新成功");}else{failureNum++;failureMsg.append("<br/>" + failureNum + "、账号 " + user.getUserName() + " 已存在");}}catch (Exception e){failureNum++;String msg = "<br/>" + failureNum + "、账号 " + user.getUserName() + " 导入失败：";failureMsg.append(msg + e.getMessage());log.error(msg, e);}}if (failureNum > 0){failureMsg.insert(0, "很抱歉，导入失败！共 " + failureNum + " 条数据格式不正确，错误如下：");throw new ServiceException(failureMsg.toString());}else{successMsg.insert(0, "恭喜您，数据已全部导入成功！共 " + successNum + " 条，数据如下：");}return successMsg.toString();}