springboot操作LDAP，查询指定ou下面的cn属性

@Autowired
    private DirContext dirContext;
    @Test
    public void getMemberUid() {
       System.out.println("第一次调用：pwd = " + searchByAttribute());
    }
    private String searchByAttribute() {
        try {
            SearchControls controls = new SearchControls();
            controls.setSearchScope(SearchControls.SUBTREE_SCOPE);
            //这个表示要查询的字段
            controls.setReturningAttributes(new String[]{"memberUid"});
            //查询指定的ou下面的cn属性  memberUid
            NamingEnumeration results = dirContext.search("ou=company", "cn=admin", controls);
            while (results.hasMore()) {
                SearchResult searchResult = (SearchResult) results.next();
                Attribute attrMemberUid = searchResult.getAttributes().get("memberUid");
                if (Objects.nonNull(attrMemberUid)) {
                    return attrMemberUid.get().toString();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }