JavaWeb - 多级菜单、分组嵌套“递归”写法

DROPTABLEIFEXISTS`t_ac_api_group`;
CREATETABLE`t_ac_api_group` (
`group_id`varchar(32) NOTNULLCOMMENT'分组Id',
`group_name`varchar(30) NOTNULLCOMMENT'分组名称',
`group_pid`varchar(32) NOTNULLCOMMENT'分组父Id',
`group_type`tinyint(1) NOTNULLCOMMENT'分组类型',
`group_del`tinyint(1) NOTNULL,
`group_createtime`datetimeNOTNULL,
`group_updatetime`datetimeNOTNULL,
PRIMARYKEY (`group_id`) USINGBTREE) ENGINE=InnoDBDEFAULTCHARSET=utf8;

importcom.baomidou.mybatisplus.annotation.*;
importcom.fasterxml.jackson.annotation.JsonInclude;
importlombok.AllArgsConstructor;
importlombok.Builder;
importlombok.Data;
importlombok.NoArgsConstructor;
importjava.time.LocalDateTime;
importjava.util.List;
/*** @author Lux Sun* @date 2020/6/5*/@Data@Builder@NoArgsConstructor@AllArgsConstructor@TableName("t_ac_api_group")
publicclassApiGroupPO {
@TableId(type=IdType.ASSIGN_UUID)
privateStringgroupId;
privateStringgroupName;
privateStringgroupPid;
privateIntegergroupType;
@TableField(exist=false)
privateList<ApiGroupPO>groupList;
@TableLogic@TableField(fill=FieldFill.INSERT, select=false)
privateIntegergroupDel;
@TableField(fill=FieldFill.INSERT)
privateLocalDateTimegroupCreatetime;
@TableField(fill=FieldFill.INSERT_UPDATE)
privateLocalDateTimegroupUpdatetime;
}

/*** [OK]* 获取根分组集* @return*/@OverridepublicList<ApiGroupPO>getGroupListByType() {
QueryWrapper<ApiGroupPO>qw=newQueryWrapper<>();
qw.orderByDesc(Const.Group.COLUMN_GROUPUPDATETIME);
List<ApiGroupPO>apiGroupPoList=groupDao.selectList(qw);
apiGroupPoList=dealApiGroupLayer(apiGroupPoList);
returnapiGroupPoList;
}
/*** [OK]* 处理分组层级* @param apiGroupList*/privateList<ApiGroupPO>dealApiGroupLayer(List<ApiGroupPO>apiGroupList) {
Map<String, ApiGroupPO>id2GroupMap=apiGroupList.stream().collect(Collectors.toMap(ApiGroupPO::getGroupId, apiGroupPO->apiGroupPO));
List<ApiGroupPO>finalApiGroupPoList=Lists.newArrayList();
for (ApiGroupPOapiGroupPo : apiGroupList) {
StringgroupPid=apiGroupPo.getGroupPid();
if (Const.Group.VAL_GROUPPIDROOT.equals(groupPid)) {
finalApiGroupPoList.add(apiGroupPo);
continue;
        }
ApiGroupPOapiParentGroupPo=id2GroupMap.get(groupPid);
// 如果为空, new List 赋值过去; 不为空也不影响, 大不了自己 set 自己一下apiParentGroupPo.setGroupList(Optional.ofNullable(apiParentGroupPo.getGroupList()).orElse(Lists.newArrayList()));
apiParentGroupPo.getGroupList().add(apiGroupPo);
    }
returnfinalApiGroupPoList;
}