父子级关系处理 java

1.多表父子级关系利用流来处理

private Listchildren; List collect1 = addressInfo.stream().map(m1 -> { List collect = addressInfo.stream().filter( m2 -> Objects.equals(m1.getId(), m2.getPId())).collect(Collectors.toList()); m1.setChildren(collect); return m1; }).collect(Collectors.toList());

说明：m1 父级信息 m2 子级信息
【父子级关系处理】2单表父子级关系处理

List list = new ArrayList(); /** * 3.循环处理全部数据，转为父子级对象 */ for (AddressInfo vo : addressInfo) { Map map = new HashMap(8); if (vo.getPId() == 0) { map.put("children", getChildren(addressInfo, vo.getId())); map.put("pId", vo.getPId()); 存放子级数据 list.add(map); } } PageInfo pageInfo = new PageInfo<>(addressInfo); return success(list, pageInfo.getTotal()); }public List getChildren(List data, Integer wzflid) { /** * 1.对数据校验处理 */ List list = new ArrayList(); if (data =https://www.it610.com/article/= null || data.size() == 0 || wzflid == null) { return list; } /** * 2.遍历匹配父子级关系数据 */ for (AddressInfo vo : data) { Map map = new HashMap(8); if (wzflid.equals(vo.getPId())) { map.put("pId", vo.getPId()); list.add(map); } } return list; }