接口：

EntityResult getOrgReal(Map<String, Object> mapParam);

实现类：

@PMethodHandle(runMethodName = "TQmsZjxmzbImpl.getOrgReal", timeout = 600)
@Override
public EntityResult getOrgReal(Map<String, Object> mapParam) {
    String mapStr = JSON.toJSONString(mapParam);
    TOrganizationRealVo resultVo = JSON.parseObject(mapStr, TOrganizationRealVo.class);
    List<TOrganizationRealVo> result =libraryList(resultVo);
    return ResultHelper.okEntity(result, "成功");
}

    /**
     * 获取第一级的元素
     */
    public List<TOrganizationRealVo> libraryList(TOrganizationRealVo sysLibrary) {
        List<TOrganizationRealVo> sysLibraries = qmsZjxmzbMapper.queryOrgReal(sysLibrary);
        return sysLibraries.stream()
                //过滤父id为0的分类
                .filter(l -> l.getParentOrgRealationId().equals("-1"))
                //将上面的过滤后得到的分类list获取子分类进行封装，
                //peek()是过程流，不会进行输出，只会对list中的每一元素都执行一次Consumer。
                .peek(c -> c.setChildren(getChildren(sysLibraries, c.getOrgRealationId())))
                //按照id进行排序
//                .sorted(Comparator.comparingLong(TOrganizationRealVo::getLibraryId))
                .collect(Collectors.toList());
    }



    /**
     * 获取子分类
     *
     * @param sysLibraries
     * @return
     */
    public List<TOrganizationRealVo> getChildren(List<TOrganizationRealVo> sysLibraries, String parentId) {
        return sysLibraries.stream()
                .filter(l -> l.getParentOrgRealationId().equals(parentId))
                .peek(c -> c.setChildren(getChildren(sysLibraries, c.getOrgRealationId())))
//                .sorted(Comparator.comparingLong(TOrganizationRealVo::getOrgRealationId))
                .collect(Collectors.toList());

    }

实体类：

/**
 * 组织
 */

@Data
public class TOrganizationRealVo {

    private String orgRealationId;

    private String orgId;

    private String parentOrgRealationId;

    private String orgName;

    private String orgCode;

    private String orgRelationCode;

    private String orgRealationType;

    private List<TOrganizationRealVo> children;

数据库直接查询所有就可以

展现效果：