如何使用java查询LDAP的ROOTDSE

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

String ldapUrl = "ldap://ldap.example.com:389"; // LDAP服务器地址和端口
String bindDn = "cn=admin,dc=example,dc=com"; // 绑定DN（Distinguished Name）
String bindPassword = "password"; // 绑定密码

Hashtable<String, String> env = new Hashtable<>();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
env.put(Context.PROVIDER_URL, ldapUrl);
env.put(Context.SECURITY_AUTHENTICATION, "simple");
env.put(Context.SECURITY_PRINCIPAL, bindDn);
env.put(Context.SECURITY_CREDENTIALS, bindPassword);

DirContext ctx = new InitialDirContext(env);

Attributes attrs = ctx.getAttributes("");
Attribute supportedCapabilities = attrs.get("supportedCapabilities");
Attribute supportedLDAPVersions = attrs.get("supportedLDAPVersion");
Attribute supportedSASLMechanisms = attrs.get("supportedSASLMechanisms");
Attribute supportedControl = attrs.get("supportedControl");
Attribute supportedExtension = attrs.get("supportedExtension");
Attribute supportedFeatures = attrs.get("supportedFeatures");
Attribute namingContexts = attrs.get("namingContexts");
// 获取其他需要的属性

// 打印或处理查询结果
System.out.println("Supported Capabilities: " + supportedCapabilities);
System.out.println("Supported LDAP Versions: " + supportedLDAPVersions);
System.out.println("Supported SASL Mechanisms: " + supportedSASLMechanisms);
System.out.println("Supported Controls: " + supportedControl);
System.out.println("Supported Extensions: " + supportedExtension);
System.out.println("Supported Features: " + supportedFeatures);
System.out.println("Naming Contexts: " + namingContexts);
// 处理其他属性

// 关闭LDAP连接
ctx.close();