前端：

/** 导出按钮操作 */
handleExport() {
  this.download('manage/task/export', {
    ...this.queryParams
  }, `task_${new Date().getTime()}.xlsx`)
},
/** 导入按钮操作 */
handleImport() {
  this.upload.title = "台账导入";
  this.upload.open = true;
},
/** 下载模板操作 */
importTemplate() {
  this.download('manage/task/importTemplate', {
  }, `user_template_${new Date().getTime()}.xlsx`)
},

// 文件上传中处理
handleFileUploadProgress(event, file, fileList) {
  this.upload.isUploading = true;
},
// 文件上传成功处理
handleFileSuccess(response, file, fileList) {
  this.upload.open = false;
  this.upload.isUploading = false;
  this.$refs.upload.clearFiles();
  this.$alert("
" + response.msg + "", "导入结果", { dangerouslyUseHTMLString: true });
  this.getList();
},
// 提交上传文件
submitFileForm(e) {
  this.$refs.upload.submit();
  console.log(this.upload.url + '?updateSupport=' + this.upload.updateSupport)

}

后端：

做service接口

实现接口：

@Override
public String importUser(List manageTaskVoList, boolean updateSupport, String operName)
{
    if (StringUtils.isNull(manageTaskVoList) || manageTaskVoList.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 (ManageTaskVo manageTaskVo : manageTaskVoList)
    {
        ManageTask m = new ManageTask();
        BeanUtils.copyProperties(manageTaskVo,m);

        String s = manageTaskVo.getPipelineNum() + "-" + manageTaskVo.getPipelineNum() + "-" + manageTaskVo.getCraterNum();
        String realUserName = manageTaskVo.getRealUserName();
        if (realUserName!=null&&realUserName!=""){
            QueryWrapper wrapper = new QueryWrapper();
            wrapper.eq("nick_name",realUserName);
            SysUserVo realOne = userService.getOne(wrapper);
            if (realOne!=null) m.setRealUserId(realOne.getUserId());
        }
        String leaderUserName = manageTaskVo.getLeaderUserName();
        if (leaderUserName!=null&&leaderUserName!=""){
            QueryWrapper wrapper = new QueryWrapper();
            wrapper.eq("nick_name",leaderUserName);
            SysUserVo leaderOne = userService.getOne(wrapper);
            if (leaderOne!=null) m.setLeaderUserId(leaderOne.getUserId());
        }

        try
        {
            // 验证是否存在这个用户
            ManageTask manageTask = manageTaskMapper.selectById(manageTaskVo.getTaskId());

            if (StringUtils.isNull(manageTask))//不存在
            {
                if (m.getTaskStatus()==2)
                    m.setEndDate(new Date());
                m.setTaskId(null);
                manageTaskMapper.insert(m);
                successNum++;
                successMsg.append("
" + successNum + "、" + s + " 导入成功");
            }
            else if (updateSupport)//存在---true 覆盖
            {
                if (m.getTaskStatus()==2 && manageTask.getEndDate()==null)
                    m.setEndDate(new Date());
                manageTaskMapper.updateById(m);
                successNum++;
                successMsg.append("
" + successNum + "、" + s + " 更新成功");
            }
            else //存在
            {
                failureNum++;
                failureMsg.append("
" + failureNum + "、" + s + " 已存在");
            }
        }
        catch (Exception e)
        {
            failureNum++;
            String msg = "
" + failureNum + "、" + s + " 导入失败：";
            failureMsg.append(msg + e.getMessage());
        }
    }
    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();
}