返回前端的父子结构

 /*
     * @Description: 查询登记类别返回父子结构
     * @Author: zhuning
     * @Date: 2020/5/28
     */
    public List<Map<String, Object>> selectDictRegisterChildrenList() throws MidException {
        List<Map<String, Object>> list = selectList(getSelectListAllSql());
        List<Map<String, Object>> returnList = new ArrayList<Map<String, Object>>();
        for (Map<String, Object> dataMap : list) {
            Map<String, Object> mapArr = new HashMap<String, Object>();
            if (dataMap.get("parentid").equals("")) {
                mapArr.put("id", dataMap.get("id"));
                mapArr.put("type", dataMap.get("type"));
                mapArr.put("category", dataMap.get("category"));
                mapArr.put("name", dataMap.get("name"));
                mapArr.put("parentid", dataMap.get("parentid"));
                if (menuChild((String) dataMap.get("id"), list).size() > 0) {
                    mapArr.put("children", menuChild((String) dataMap.get("id"), list));
                }
                returnList.add(mapArr);
            }
        }
        return returnList;
    }

    private List<Map<String, Object>> menuChild(String id, List<Map<String, Object>> listmap) {
        List<Map<String, Object>> lists = new ArrayList<Map<String, Object>>();
        for (Map<String, Object> dataMap2 : listmap) {
            Map<String, Object> childArray = new HashMap<String, Object>(16);
            if (id.equals(dataMap2.get("parentid"))) {
                childArray.put("id", dataMap2.get("id"));
                childArray.put("type", dataMap2.get("type"));
                childArray.put("category", dataMap2.get("category"));
                childArray.put("name", dataMap2.get("name"));
                childArray.put("parentid", dataMap2.get("parentid"));
                if (menuChild((String) dataMap2.get("id"), listmap).size() > 0) {
                    childArray.put("children", menuChild((String) dataMap2.get("id"), listmap));
                }
                lists.add(childArray);
            }
        }
        return lists;
    }