Spring Boot + Mybatis Plus实现树状菜单的方法

1、实体类中添加子菜单列表或集合

 @tablefield(exist = false)
    private set<sysmenu> childrenlist = new hashset<>();

2、定义一个方法递归的获取子菜单

public sysmenu getchildrenlist(sysmenu sysmenu, list<sysmenu> sysmenulist) {
        for (sysmenu menu : sysmenulist) {
            if (menu.getmenuparentid().equals(sysmenu.getid())) {
                sysmenu.getchildrenlist().add(getchildrenlist(menu, sysmenulist));
            }
        }
        return sysmenu;
    }

3、构建菜单树

 public list<sysmenu> menutree() {
        //获取所有菜单
        list<sysmenu> sysmenulist = list(new lambdaquerywrapper<sysmenu>()
                //::在java8中的作用就是获得方法
                .eq(sysmenu::getmenutype, resultconstant.menu)
        );
        //stream().filter()作用：过滤一个list对象，查找符合条件的对象集合
        list<sysmenu> firstmenulist = sysmenulist.stream().filter
                //过滤出一级菜单
                (s -> s.getmenuparentid().equals(resultconstant.menu_top))
                // 返回list集合形式
                .collect(collectors.tolist());
        // 遍历一级菜单,构造菜单树
        for (sysmenu menu : firstmenulist) {
            getchildrenlist(menu, sysmenulist);
        }
        return firstmenulist;
    }

菜单表如下

create table `sys_menu` (
  `id` bigint(20) not null auto_increment,
  `menu_name` varchar(255) collate utf8mb4_bin default null comment '资源名称',
  `menu_permission` varchar(255) collate utf8mb4_bin default null comment '权限',
  `menu_path` varchar(255) collate utf8mb4_bin default null comment '对应url',
  `menu_parent_id` bigint(20) default null comment '父节点id',
  `menu_type` int(11) default null comment '菜单类型0菜单，1栏目类型',
  `order_num` int(11) default null comment '排序字段：值越小 顺序越靠前',
  `create_time` datetime default null comment '创建时间',
  `update_time` datetime default null comment '最后更新时间',
  primary key (`id`) using btree
) engine=innodb auto_increment=75 default charset=utf8mb4 collate=utf8mb4_bin row_format=dynamic comment='菜单表';

-- ----------------------------
-- records of sys_menu
-- ----------------------------
insert into `sys_menu` values ('1', '菜单树', 'homepage:menutree', '', '0', '0', '1', '2021-09-17 12:46:11', '2021-09-17 12:46:11');
insert into `sys_menu` values ('2', '登录模块', null, null, '0', '0', '2', null, null);
insert into `sys_menu` values ('3', '登录', null, '/login', '2', '1', '1', null, null);
insert into `sys_menu` values ('4', '修改密码', null, '/login/updatepassword', '2', '1', '2', null, null);
insert into `sys_menu` values ('5', '修改个人信息', null, '/login/updatemessage', '2', '1', '3', null, null);
insert into `sys_menu` values ('6', '忘记密码', 'login:forgetpassword', '/login/forgetpassword', '2', '1', '4', null, null);
insert into `sys_menu` values ('7', '消息通知管理', null, null, '0', '0', '3', null, null);
insert into `sys_menu` values ('8', '发布通知', 'notice:insert', '/notice/insert', '7', '1', '1', null, null);
insert into `sys_menu` values ('9', '修改通知', 'notice:update', '/notice/update', '7', '1', '2', null, null);
insert into `sys_menu` values ('10', '删除通知', 'notice:delete', '/notice/delete', '7', '1', '3', null, null);
insert into `sys_menu` values ('11', '查看所有通知', 'notice:listall', '/notice/listall', '7', '1', '4', null, null);
insert into `sys_menu` values ('12', '查看本人已发布通知', 'notice:noticelist', '/notice/noticelist', '7', '1', '5', null, null);
insert into `sys_menu` values ('13', '查看所有已发布通知', 'notice:releasednotice', '/notice/releasednotice', '7', '1', '6', null, null);
insert into `sys_menu` values ('14', '系统管理', null, null, '0', '0', '4', null, null);
insert into `sys_menu` values ('15', '用户管理', null, null, '14', '0', '1', null, null);
insert into `sys_menu` values ('16', '添加用户', 'user:insert', '/user/insert', '15', '1', '1', null, null);
insert into `sys_menu` values ('17', '修改用户信息', 'user:update', '/user/update', '15', '1', '2', null, null);
insert into `sys_menu` values ('18', '删除用户信息', 'user:delete', '/user/delete', '15', '1', '3', null, null);
insert into `sys_menu` values ('19', '查看所有用户信息', 'user:listall', '/user/listall', '15', '1', '4', null, null);
insert into `sys_menu` values ('20', '分配用户角色', 'user:setrole', '/user/setrole', '15', '1', '5', null, null);
insert into `sys_menu` values ('21', '角色管理', null, null, '14', '0', '2', null, null);
insert into `sys_menu` values ('22', '添加角色', 'role:insert', '/role/insert', '21', '1', '1', null, null);
insert into `sys_menu` values ('23', '修改角色信息', 'role:update', '/role/update', '21', '1', '2', null, null);
insert into `sys_menu` values ('24', '删除角色', 'role:delete', '/role/delete', '21', '1', '3', null, null);
insert into `sys_menu` values ('25', '查看所有角色', 'role:listall', 'role:listall', '21', '1', '4', null, null);
insert into `sys_menu` values ('26', '设置角色权限', 'role:setmenu', '/role/setmenu', '21', '1', '5', null, null);
insert into `sys_menu` values ('27', '查看自己是否各个拥有角色', 'role:myrole', '/role/myrole', '21', '1', '6', null, null);
insert into `sys_menu` values ('28', '权限管理', null, null, '14', '0', '3', null, null);
insert into `sys_menu` values ('29', '添加权限', 'menu:insert', '/menu/insert', '28', '1', '1', null, null);
insert into `sys_menu` values ('30', '修改权限', 'menu:update', '/menu/update', '28', '1', '2', null, null);
insert into `sys_menu` values ('31', '删除权限', 'menu:delete', '/menu/delete', '28', '1', '3', null, null);
insert into `sys_menu` values ('32', '查看所有权限', 'menu:listall', '/menu/listall', '28', '1', '4', null, null);
insert into `sys_menu` values ('33', '登录日志', '', '', '14', '0', '4', null, null);
insert into `sys_menu` values ('34', '操作日志', '', '', '14', '0', '5', null, null);
insert into `sys_menu` values ('35', '信息管理', null, null, '0', '0', '5', null, null);
insert into `sys_menu` values ('36', '查看所有学生信息', 'student:listall', '/student/listall', '35', '0', '1', null, null);
insert into `sys_menu` values ('37', '查看所有教师信息', 'teacher:listall', '/teacher/listall', '35', '0', '2', null, null);
insert into `sys_menu` values ('38', '班级信息管理', null, null, '35', '0', '3', null, null);
insert into `sys_menu` values ('39', '添加班级', 'class:insert', '/class/insert', '38', '1', '1', null, null);
insert into `sys_menu` values ('40', '修改班级信息', 'class:update', '/class/update', '38', '1', '2', null, null);
insert into `sys_menu` values ('41', '删除班级', 'class:delete', '/class/delete', '38', '1', '3', null, null);
insert into `sys_menu` values ('42', '查看所有班级', 'class:listall', '/class/listall', '38', '1', '4', null, null);
insert into `sys_menu` values ('43', '专业管理', null, null, '35', '0', '4', null, null);
insert into `sys_menu` values ('44', '添加专业', 'major:insert', '/major/insert', '43', '1', '1', null, null);
insert into `sys_menu` values ('45', '修改专业信息', 'major:update', '/major/update', '43', '1', '2', null, null);
insert into `sys_menu` values ('46', '删除专业', 'major:delete', '/major/delete', '43', '1', '3', null, null);
insert into `sys_menu` values ('47', '查看所有专业', 'major:listall', '/major/listall', '43', '1', '4', null, null);
insert into `sys_menu` values ('48', '学院管理', null, null, '35', '0', '5', null, null);
insert into `sys_menu` values ('49', '添加学院', 'institute:insert', '/institute/insert', '48', '1', '1', null, null);
insert into `sys_menu` values ('50', '修改学院信息', 'institute:update', '/institute/update', '48', '1', '2', null, null);
insert into `sys_menu` values ('51', '删除学院', 'institute:delete', '/institute/delete', '48', '1', '3', null, null);
insert into `sys_menu` values ('52', '查看所有学院', 'institute:listall', '/institute/listall', '48', '1', '4', null, null);
insert into `sys_menu` values ('53', '上课管理', null, null, '0', '0', '6', null, null);
insert into `sys_menu` values ('54', '课程表', null, null, '53', '0', '1', null, null);
insert into `sys_menu` values ('55', '添加课程', 'lesson:insert', '/lesson/insert', '54', '1', '1', null, null);
insert into `sys_menu` values ('56', '修改课程', 'lesson:update', '/lesson/update', '54', '1', '2', null, null);
insert into `sys_menu` values ('57', '删除课程', 'lesson:delete', '/lesson/delete', '54', '1', '3', null, null);
insert into `sys_menu` values ('58', '查看所有课程', 'lesson:listall', '/lesson/listall', '54', '1', '4', null, null);
insert into `sys_menu` values ('59', '考勤管理', null, null, '53', '0', '2', null, null);
insert into `sys_menu` values ('60', '教师发放签到', 'lesson:startcourse', '/lesson/startcourse', '59', '1', '1', null, null);
insert into `sys_menu` values ('61', '学生签到', 'attendance:studentsignin', '/attendance/studentsignin', '59', '1', '2', null, null);
insert into `sys_menu` values ('62', '查看考勤信息', 'attendance:listall', '/attendance/listall', '59', '1', '3', null, null);
insert into `sys_menu` values ('63', '请假管理', null, null, '0', '0', '7', null, null);
insert into `sys_menu` values ('64', '学生请假', 'leave:studentleave', '/leave/studentleave', '63', '1', '1', null, null);
insert into `sys_menu` values ('65', '修改请假信息', 'leave:studentupdate', '/leave/studentupdate', '63', '1', '2', null, null);
insert into `sys_menu` values ('66', '删除请假', 'leave:studentdelete', '/leave/studentdelete', '63', '1', '3', null, null);
insert into `sys_menu` values ('67', '查看所有请假信息', 'leave:listall', '/leave/listall', '63', '1', '4', null, null);
insert into `sys_menu` values ('68', '请假审批', 'leave:approval', '/leave/approval', '63', '1', '5', null, null);
insert into `sys_menu` values ('69', '查看登录日志', 'loginlog:listall', '/loginlog/listall', '33', '1', '1', null, null);
insert into `sys_menu` values ('70', '删除登录日志', 'loginlog:delete', '/loginlog/delete', '33', '1', '2', null, null);
insert into `sys_menu` values ('71', '查看操作日志', 'operatelog:listall', '/operatelog/listall', '34', '1', '1', null, null);
insert into `sys_menu` values ('72', '删除操作日志', 'operatelog:delete', '/operatelog/delete', '34', '1', '2', null, null);
insert into `sys_menu` values ('73', '分配教师班级', 'teacher:assignteacherclasses', '/teacher/assignteacherclasses', '38', '1', '5', null, null);
insert into `sys_menu` values ('74', '查看教师是否任教各个班级', 'teacher:myclass', '/teacher/myclass', '38', '1', '6', null, null);

效果如下

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