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Hutool返回树结构工具类TreeUtil

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本文字数： 6.1k 阅读时长 ≈ 6 分钟

考虑到菜单等需求的普遍性，有用户提交了一个扩展性极好的树状结构实现。这种树状结构可以根据配置文件灵活的定义节点之间的关系，也能很好的兼容关系数据库中数据

数据的实体类如下：

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public class MenuInfo implements Serializable {
    private static final long serialVersionUID = -8839460886585312600L;

    @Column(columnDefinition = "varchar(50)  comment '菜单名称'")
    private String menuName;

    @Column(columnDefinition = "varchar(50)  comment '允许操作编码'")
    private String permission;

    @Column(columnDefinition = "varchar(50)  comment '菜单地址'")
    private String path;

    @Column(columnDefinition = "int(1)  comment '父级ID'")
    private Integer parentId;

    @Column(columnDefinition = "varchar(50)  comment '菜单图标'")
    private String icon;

    @Column(columnDefinition = "int(1)  comment '排序'")
    private Integer sort;

    @Column(columnDefinition = "int(1)  comment '路由缓冲'")
    private Integer keepAlive;

    @Column(columnDefinition = "int(1)  comment '菜单类型,0:菜单 1:按钮'")
    private Integer type;

}

数据库数据如下：

查询出来的数据源：

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List<MenuInfo> menuInfos = this.menuService.list();

将List<MenuInfo>转化为树结构：

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private List<Tree<Integer>> menuTreeConvert(List<MenuInfo> menuInfos,Integer parentId){
    List<TreeNode<Integer>> nodeList = menuInfos.stream().map(menuInfo -> {
        
       //扩展字段
        Map<String, Object> map = new HashMap<>();
        map.put("type", menuInfo.getType());
        map.put("keepAlive", menuInfo.getKeepAlive());
        map.put("icon", menuInfo.getIcon());
        map.put("path", menuInfo.getPath());
        map.put("sort", menuInfo.getSort());
        map.put("permission", menuInfo.getPermission());
      
        TreeNode<Integer> treeNode = new TreeNode<Integer>()
                 //ID
                .setId(menuInfo.getId())
                .setName(menuInfo.getMenuName())
                .setParentId(menuInfo.getParentId())
                .setWeight(menuInfo.getSort())
                .setExtra(map);
        return treeNode;
    }).collect(Collectors.toList());
    //配置
    TreeNodeConfig treeNodeConfig = new TreeNodeConfig();
    treeNodeConfig.setChildrenKey("children");
    treeNodeConfig.setParentIdKey("parentId");
    treeNodeConfig.setNameKey("name");
    treeNodeConfig.setWeightKey("sort");
    // 最大递归深度
    treeNodeConfig.setDeep(3);
    //转换器
   return TreeUtil.build(nodeList,parentId);
}

返回实例：

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[
       {
           "id": 1,
           "parentId": 0,
           "weight": 1,
           "name": "容器管理",
           "path": "/container",
           "keepAlive": 0,
           "icon": "icon-mokuai",
           "permission": "",
           "sort": 1,
           "type": 0
       },
       {
           "id": 2,
           "parentId": 0,
           "weight": 2,
           "name": "样本源管理",
           "path": "/sample_source",
           "keepAlive": 0,
           "icon": "icon-zaixianyonghu",
           "permission": "",
           "sort": 2,
           "type": 0
       },
       {
           "id": 3,
           "parentId": 0,
           "weight": 3,
           "name": "样本管理",
           "path": "/sample_manage",
           "keepAlive": 0,
           "icon": "icon-yangbenzu",
           "permission": "",
           "sort": 3,
           "type": 0
       },
       {
           "id": 4,
           "parentId": 0,
           "weight": 4,
           "name": "随访管理",
           "path": "/followup",
           "keepAlive": 0,
           "icon": "icon-gongyingshang2",
           "permission": "",
           "sort": 4,
           "type": 0
       },
       {
           "id": 5,
           "parentId": 0,
           "weight": 5,
           "name": "数据采集",
           "path": "/plc",
           "keepAlive": 0,
           "icon": "icon-wodeyingyong",
           "permission": "",
           "sort": 5,
           "type": 0
       },
       {
           "id": 6,
           "parentId": 0,
           "weight": 6,
           "name": "权限管理",
           "path": "/user",
           "keepAlive": 0,
           "icon": "icon-renwu",
           "permission": "",
           "sort": 6,
           "type": 0,
           "children": [
               {
                   "id": 7,
                   "parentId": 6,
                   "weight": 1,
                   "name": "菜单管理",
                   "path": "/admin/menu/index",
                   "keepAlive": 0,
                   "icon": "icon-caidan",
                   "permission": "",
                   "sort": 1,
                   "type": 0,
                   "children": [
                       {
                           "id": 8,
                           "parentId": 7,
                           "weight": 1,
                           "name": "菜单查阅",
                           "path": "",
                           "keepAlive": 0,
                           "icon": "",
                           "permission": "sys_menu_view",
                           "sort": 1,
                           "type": 1
                       },
                       {
                           "id": 9,
                           "parentId": 7,
                           "weight": 2,
                           "name": "菜单新增",
                           "path": "",
                           "keepAlive": 0,
                           "icon": "",
                           "permission": "sys_menu_add",
                           "sort": 2,
                           "type": 1
                       },
                       {
                           "id": 10,
                           "parentId": 7,
                           "weight": 3,
                           "name": "菜单修改",
                           "path": "",
                           "keepAlive": 0,
                           "icon": "",
                           "permission": "sys_menu_edit",
                           "sort": 3,
                           "type": 1
                       },
                       {
                           "id": 11,
                           "parentId": 7,
                           "weight": 4,
                           "name": "菜单删除",
                           "path": "",
                           "keepAlive": 0,
                           "icon": "",
                           "permission": "sys_menu_del",
                           "sort": 4,
                           "type": 1
                       }
                   ]
               },
               {
                   "id": 12,
                   "parentId": 6,
                   "weight": 2,
                   "name": "用户管理",
                   "path": "/admin/user/index",
                   "keepAlive": 0,
                   "icon": "icon-wodezhanghu",
                   "permission": "",
                   "sort": 2,
                   "type": 0
               }
           ]
       }
   ]

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