Java导出excel表

public ModelAndView exportXls(HttpServletRequest request, MeetingEnter meetingEnter,String meetingId) {
//导出相同会议下的报名名单

      Map<String, String[]> parameterMap = request.getParameterMap();
      Map<String, String[]> map = new HashMap<>();
      List<MeetingEnter> meetingEnterList= meetingEnterService.selectByMeetingId(meetingId);
      Iterator<Map.Entry<String, String[]>> iterator = map.entrySet().iterator();
      while (iterator.hasNext()){
          Map.Entry<String, String[]> next = iterator.next();
          String key = next.getKey();
          next.setValue(meetingEnterList.toArray(new String[]{}));
          if (key!=null&&map.get(key)!=null){
              parameterMap.put(key.toString(),map.get(key));
          }
      }
      return super.exportXls(request,meetingEnter,MeetingEnter.class, "会议报名管理");
  }

protected ModelAndView exportXls(HttpServletRequest request, T object, Class<T> clazz, String title) {
        // Step.1 组装查询条件
        QueryWrapper<T> queryWrapper = QueryGenerator.initQueryWrapper(object, request.getParameterMap());
        LoginUser sysUser = (LoginUser) SecurityUtils.getSubject().getPrincipal();

        // Step.2 获取导出数据
        List<T> pageList = service.list(queryWrapper);
        List<T> exportList = null;

        // 过滤选中数据
        String selections = request.getParameter("selections");
        if (oConvertUtils.isNotEmpty(selections)) {
            List<String> selectionList = Arrays.asList(selections.split(","));
            exportList = pageList.stream().filter(item -> selectionList.contains(getId(item))).collect(Collectors.toList());
        } else {
            exportList = pageList;
        }

        // Step.3 AutoPoi 导出Excel
        ModelAndView mv = new ModelAndView(new JeecgEntityExcelView());
        mv.addObject(NormalExcelConstants.FILE_NAME, title); //此处设置的filename无效 ,前端会重更新设置一下
        mv.addObject(NormalExcelConstants.CLASS, clazz);
        mv.addObject(NormalExcelConstants.PARAMS, new ExportParams(title + "报表", "导出人:" + sysUser.getRealname(), title));
        mv.addObject(NormalExcelConstants.DATA_LIST, exportList);
        return mv;
    }