获取目录树（参数：目录名称；返回信息：参数为父集，返回父集菜单和子集全部可用菜单；参数为子集对象，返回集为对应父集菜单和该子集对象）

一、serviceimpl的实现方法

public List<DataSource> list(DataSource dataSource) {
		//		封装父集list
		List<DataSource> mapSources = new ArrayList<>();
//		封装子集list
		List<DataSource> mapSourceList = new ArrayList<>();

		List<DataSource> mapSourceByName = dataSourceMapper.findDataSourceByName(dataSource);

		//		1、遍历查询出的父结构，并添加进new的list当中
		for (DataSource mapSource1:mapSourceByName){
			if ("0".equals(mapSource1.getPid())){
				mapSources.add(mapSource1);
			}
			else{
//				根据自集对象获取父集对象
				mapSourceList.add(mapSource1);
			}
		}
		mapSourceByName.clear();

		if (null == mapSources || mapSources.size() <= 0){
//			子集构建父集
			List<DataSource> mapSources1 = new ArrayList<>();
			for (DataSource mapSourc:mapSourceList){
				DataSource mapSource1 = new DataSource();
				mapSource1.setOrgcode(mapSourc.getOrgcode());
				mapSource1.setId(mapSourc.getPid());
				DataSource mapSource2 = dataSourceMapper.findDataSourceByName(mapSource1).get(0);
				mapSources1.add(mapSource2);
			}

			mapSources = mapSources1.stream().distinct().collect(Collectors.toList());
			mapSourceByName = mapSourceList;
		}
		//		父集非空并且子集为空的情况
		if (null != mapSources && mapSourceByName.size() == 0){

			mapSourceList.clear();

			for (DataSource mapSource1:mapSources){
				DataSource mapSource2 = new DataSource();
				mapSource2.setPid(mapSource1.getId());
				mapSource2.setOrgcode(mapSource1.getOrgcode());

				dataSourceMapper.findDataSourceByName(mapSource2).forEach(mapSource3 -> {

					mapSourceList.add(mapSource3);
				});
			}
			mapSourceByName = mapSourceList;
                       }
//		mapSourceByName子集
//		mapSources父集
		for (DataSource mapSource:mapSources){
			ArrayList<DataSource> dataSources = new ArrayList<>();
			for (DataSource dataSource1:mapSourceByName){
				if (mapSource.getId().equals(dataSource1.getPid())){
					dataSources.add(dataSource1);
				}
			}
			mapSource.setDataSourceList(dataSources);
		}
		return mapSources;
		}

二、mapper接口的sql实现

<select id="findDataSourceByName" parameterType="java.lang.Object" resultMap="DataSource">
        select
        a.ID as id,
        a.PID as pid,
        a.NAME as name,
        a.CONTROLLER_U as controllerU,
        a.CONTROLLER_R as controllerR,
        a.CONTROLLER_D as controllerD,
        a.UPDATETIME as updatetime,
        a.CREATETIME as createtime,
        a.UPDATEBYID as updatebyid,
        a.URL as url,
        a.ORDERBY as orderby
        from
        DATA_SOURCE a inner join ORGCODE_DATA_REL b
        on a.ID = b.DATASOURCEID
        and b.STATUS = '0'
        <where>
            <if test="orgcode != null and orgcode != ''">
                AND b.ORGCODE = #{orgcode}
            </if>
            <if test="id != null and id != ''">
                and a.ID = #{id}
            </if>
            <if test="pid != null and pid != ''">
                and a.PID = #{pid}
            </if>
            <if test="name != null and name != ''">
                and a.NAME like concat('%',concat(#{name},'%'))
            </if>
        </where>
        order by a.ORDERBY asc
    </select>