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效果图

根据输入的id为2查询出所有的红色框起来的节点

mapper接口

TSystemOrg getOrgByorgId(String orgId);
List<TSystemOrg> getOrgListByParentId(String parentId);

mapper.xml

<!--根据id查询org-->
<select id="getOrgByorgId" resultType="com.iflytek.core.entity.TSystemOrg">
   SELECT
      *
   FROM
      t_system_org
   WHERE
      id=#{orgId}
   and
      is_delete = '0'
</select>

<!--根据parentId查询orgList-->
<select id="getOrgListByParentId" resultType="com.iflytek.core.entity.TSystemOrg">
   SELECT
      *
   FROM
      t_system_org
   WHERE
      parent_id=#{parentId}
   and
      is_delete = '0'
</select>

service接口

List<TSystemOrg> getOrgListByOrgId(String orgId);

serviceImpl实现

@Override
public List<TSystemOrg> getOrgListByOrgId(String orgId) {
    TSystemOrg org = mapper.getOrgByorgId(orgId);
    List<TSystemOrg> resultList = new ArrayList<>();
    resultList.add(org);
    diguiGetOrgListByParentId(org, resultList);
    return resultList;
}

private void diguiGetOrgListByParentId(TSystemOrg org, List<TSystemOrg> resultList) {
    List<TSystemOrg> orgList = mapper.getOrgListByParentId(org.getId());
    if(orgList != null){
        for(TSystemOrg o : orgList){
            resultList.add(o);
            //递归调用自己
            diguiGetOrgListByParentId(o,resultList);
        }
    }
}

controller

@ApiOperation(value = "根据orgId获取所有子节点",tags = "机构")
@PostMapping("getOrgListByOrgId")
public ResultDto getOrgListByOrgId(String orgId){
    return ResultUtil.success("success", service.getOrgListByOrgId(orgId));
}