Java: LDAP搜索返回1行

import javax.naming.*;
import javax.naming.directory.*;

public class LDAPSearchExample {
    public static void main(String[] args) {
        String ldapUrl = "ldap://ldap.example.com:389";
        String baseDn = "dc=example,dc=com";
        String searchFilter = "(cn=John Doe)";

        Hashtable<String, String> env = new Hashtable<>();
        env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
        env.put(Context.PROVIDER_URL, ldapUrl);

        try {
            DirContext ctx = new InitialDirContext(env);

            SearchControls searchControls = new SearchControls();
            searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE);

            NamingEnumeration<SearchResult> results = ctx.search(baseDn, searchFilter, searchControls);

            if (results.hasMore()) {
                SearchResult result = results.next();
                Attributes attributes = result.getAttributes();

                // 处理返回的数据
                // ...

                System.out.println("LDAP搜索结果：");
                System.out.println(attributes);
            } else {
                System.out.println("未找到匹配的LDAP条目。");
            }

            ctx.close();
        } catch (NamingException e) {
            e.printStackTrace();
        }
    }
}