java 运用Lists

用Lists.transform返回多个List

       List<String> realNames = Lists.transform(applys, a -> { 
   
			String realName = a.getRealName();
			if (StringUtils.isNotEmpty(realName)) { 
   
				StringBuilder stringBuilder = new StringBuilder(realName);
				realName = stringBuilder.replace(1, stringBuilder.length(), "*").toString();
			}

			return realName;
		}).stream().filter(a -> StringUtils.isNotEmpty(a)).distinct().collect(Collectors.toList());

java中一对多的关系 取出

	public BaseResponseVo<List<FeedBackVo>> query(FeedBackQo feedBackQo) { 
   
		PageHelper.startPage(feedBackQo.getPage(), feedBackQo.getLimit());
		List<FeedBackVo> feedBackVos = feedBackMapper.query(feedBackQo);
		PageInfo<FeedBackVo> pageInfo = new PageInfo<>(feedBackVos);
		List<FeedBackVo> feedBackVoList = new ArrayList<>();
		if (feedBackVos.size() > 0) { 
   
			// 取出所有的Id
			List<String> imgSpecs = Lists.transform(feedBackVos, t -> t.getId());
			// 根据Id和类型查询图片
			List<ImgEntity> imgEntities = imgMapper.queryByTypeAndBizids(TransactionType.FEEDBACK.getType(), imgSpecs);
			// 根据BizId分组
			Map<String, List<ImgEntity>> imgMaps = imgEntities.stream().collect(Collectors.groupingBy(i -> i.getBizId()));
			for (int i = 0; i < feedBackVos.size(); i++) { 
   
				FeedBackVo feedBackVo1 = feedBackVos.get(i);
				if (imgMaps != null && imgMaps.get(feedBackVo1.getId()) != null) { 
   
					List<String> imgUrls = Lists.transform(imgMaps.get(feedBackVo1.getId()), t -> t.getUrl());
					feedBackVo1.setImgList(imgUrls);
				}
				feedBackVoList.add(feedBackVo1);
			}
		}

		return BaseResponseVo.succ(pageInfo.getTotal(), feedBackVoList);
	}

今天的文章java 运用Lists分享到此就结束了，感谢您的阅读。