三行代码让link转成VO

List<GroupLinkVO> linkUserList = groupLinks.parallelStream().map(l -> BeanUtils.copyProperties(l, GroupLinkVO::new))
                .peek(link -> Opt.ofNullable(link.getUserId()).map(userMapByIds::get).peek(link::setUser))
                .filter(link -> Objects.nonNull(link.getUser())).collect(Collectors.toList());