关于java:父子级关系处理

1.多表父子级关系利用流来解决

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

阐明：m1 父级信息 m2 子级信息

2单表父子级关系解决

List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();    /**     * 3.循环解决全副数据，转为父子级对象     */    for (AddressInfo vo : addressInfo) {        Map<String, Object> map = new HashMap<String, Object>(8);        if (vo.getPId() == 0) {            map.put("children", getChildren(addressInfo, vo.getId()));            map.put("pId", vo.getPId());            寄存子级数据            list.add(map);        }    }    PageInfo<AddressInfo> pageInfo = new PageInfo<>(addressInfo);    return success(list, pageInfo.getTotal());}public List<Map<String, Object>> getChildren(List<AddressInfo> data, Integer wzflid) {    /**     * 1.对数据校验解决     */    List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();    if (data == 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<String, Object> map = new HashMap<String, Object>(8);        if (wzflid.equals(vo.getPId())) {            map.put("pId", vo.getPId());                        list.add(map);        }    }    return list;}