java 构建树型结构

构建属性结构

 public static List<Map<String, Object>> buildTree(List<AreaInfo> dataList) {

        Map<String, Map<String, Object>> nodeMap = new HashMap<>();

        List<Map<String, Object>> result = new ArrayList<>();

        for (AreaInfodata : dataList) {
            String id = data.getAreaCode();
            String label = data.getAreaName();
            Map<String, Object> node = new HashMap<>();
            node.put("id", id);
            node.put("label", label);
            node.put("children", new ArrayList<Map<String, Object>>());
            nodeMap.put(id, node);
        }

        // 构建父子关系
        for (AreaInfodata : dataList) {
            String id = data.getAreaCode();
            String parentId = data.getParentId();
            //判断是否是父级
            if (parentId.equals("100000")) {
                result.add(nodeMap.get(id));
            } else {
                // 否则，将当前节点加入到父节点的children列表
                Map<String, Object> parentNode = nodeMap.get(parentId);
                if (parentNode != null) {
                    List<Map<String, Object>> childrenList = (List<Map<String, Object>>) parentNode.get("children");
                    childrenList.add(nodeMap.get(id));
                }
            }
        }

        return result;
    }
     public List<Map<String, Object>>   bulidAreaInfoTree() {
        List<AreaInfo> all = repository.findAll();
        List<Map<String, Object> >stringObjectMap = buildTree(all);
        return areaInfoMap;
    }