package com.wgymt.jxc.entity;

import lombok.Data;

import java.util.List;

/**
 * 商品类别VO
 */
@Data
public class GoodsTypeVO {

    private Integer goodsTypeId;
    private String goodsTypeName;
    private Integer pId;
    private Integer goodsTypeState;

    private List<GoodsTypeVO> children;
}

package com.wgymt.jxc.dao;

import com.wgymt.jxc.entity.GoodsTypeVO;

import java.util.List;

public interface GoodsTypeDao {

    // 返回根目录
    List<GoodsTypeVO> selectGoodsTypeTree();

    // 根据父级菜单获取子菜单(二级.三级...)
    List<GoodsTypeVO> selectChildrenTree(Integer pId);
}

package com.wgymt.jxc.service;

/**
 * 商品类别
 */
public interface GoodsTypeService {

    // 商品分类树形展示
    String getGoodsTypeTree();
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.wgymt.jxc.dao.GoodsTypeDao">

    <resultMap id="goodsTypeVOMap" type="com.atguigu.jxc.entity.GoodsTypeVO">
        <id column="goods_type_id" property="goodsTypeId"/>
        <result column="goods_type_name" property="goodsTypeName"/>
        <result column="p_id" property="pId"/>
        <result column="goods_type_state" property="goodsTypeState"/>
        <collection property="children" ofType="com.atguigu.jxc.entity.GoodsTypeVO" select="selectChildrenTree"
                    column="goods_type_id"/>
    </resultMap>
    <select id="selectGoodsTypeTree" resultMap="goodsTypeVOMap">
        SELECT goods_type_id,
               goods_type_name,
               p_id,
               goods_type_state
        FROM t_goods_type
        WHERE p_id = -1
    </select>

    <select id="selectChildrenTree" resultMap="goodsTypeVOMap">
        SELECT goods_type_id,
               goods_type_name,
               p_id,
               goods_type_state
        FROM t_goods_type
        WHERE p_id = #{goodsTypeId}
    </select>
</mapper>

//*[@id="normalthread_2766736"]

以上这种情况 id 属性值是变化的只能选择单一的一条, 那么可以使用下面这种模糊搜索的方法做一个普遍选择.

def dir_list(path):

    dirs_list = []
    dirs = os.listdir(path)
    for d in dirs:
        if os.path.isdir(path + os.sep + d):
            dirs_list.append(path + os.sep + d)

    # 根据文件(夹)名称中的序号排列
    dirs_list.sort(key=lambda x: int(x.split("/")[-1]))

import re

content = '42ak54yr50ir422ix6l2g'
content = re.sub('\d+', '', content)
# 如果要去除字母或者符号等可以改变匹配内容
# 比如去字母 可以把\d+ 换成 [a-zA-Z]
print(content)