如何通过JNDI检索LDAP密码

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

public class LDAPPasswordRetriever {
    public static void main(String[] args) {
        // LDAP服务器配置信息
        String ldapUrl = "ldap://ldap.example.com:389";
        String ldapUsername = "cn=admin,dc=example,dc=com";
        String ldapPassword = "adminPassword";

        // 用户信息
        String userDn = "uid=johndoe,ou=users,dc=example,dc=com";

        // 创建JNDI上下文
        try {
            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, ldapUsername);
            env.put(Context.SECURITY_CREDENTIALS, ldapPassword);

            DirContext ctx = new InitialDirContext(env);

            // 检索用户密码
            Attributes attrs = ctx.getAttributes(userDn);
            Attribute passwordAttr = attrs.get("userPassword");
            String password = new String((byte[]) passwordAttr.get());

            System.out.println("LDAP密码: " + password);

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