Java添加、修改MS AD用户密码

最近研究了下在AD中如何添加和修改用户密码。AD中修改密码一定要通过SSL或TLS才可以进行修改，这是MS硬性规定的，这就造成了还要做很多其它方面的配置工作，很麻烦，不过想想也合理，传输密码不加密被截获了也就完了。
前期要做的工作基本就是安装CA，获取证书，绑定keystore等等，过几天会详细写一下这几步的操作，现在先贴出代码。
import java.io.UnsupportedEncodingException;
import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.BasicAttribute;
import javax.naming.directory.DirContext;
import javax.naming.directory.ModificationItem;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import javax.naming.ldap.InitialLdapContext;
import javax.naming.ldap.LdapContext;

public class OpAD{

 private LdapContext ctx = null;

 private String adminName = "[email protected]";

 private String adminpassword = "password";

 private String keystore = "C:/testca.keystore";

 private String keyPassword = "changeit";

 private String ldapURL = "ldaps://ldap.testad.com:636";

 private String searchBase = "DC=testad,DC=com";

 private String returnedAtts[] = { "distinguishedName" };

 private boolean initial_Ldap() {

  Hashtable env = new Hashtable();
  System.setProperty("javax.net.ssl.trustStore", keystore);
  System.setProperty("javax.net.ssl.trustStorePassword", keyPassword);
  env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
  env.put(Context.SECURITY_AUTHENTICATION, "simple");
  env.put(Context.SECURITY_PRINCIPAL, adminName);
  env.put(Context.SECURITY_CREDENTIALS, adminpassword);
  env.put(Context.SECURITY_PROTOCOL, "ssl");
  env.put(Context.PROVIDER_URL, ldapURL);

  try {
   System.out.println("Start InitialLdapContext");
   ctx = new InitialLdapContext(env, null);
   System.out.println("InitialLdapContext succeed");
  } catch (NamingException e) {
   System.out.println("Problem initial_Ldap NamingException: " + e);
   return false;
  }

  return true;
 }

 private boolean close_Ldap() {
  System.out.println("Close Ldap");
  try {
   ctx.close();
  } catch (NamingException e) {
   System.out.println("Problem close_Ldap NamingException: " + e);
   return false;
  }
  return true;
 }

 private String search_distinguishedName(String username) {
  String searchFilter = "(&(objectClass=user)(cn=" + username + "))";

  try {
   System.out.println("Start search " + username + "'s distinguishedName");
   SearchControls searchCtls = new SearchControls();
   searchCtls.setSearchScope(SearchControls.SUBTREE_SCOPE);
   searchCtls.setReturningAttributes(returnedAtts);
   NamingEnumeration answer = ctx.search(searchBase, searchFilter,
     searchCtls);
   if (answer.hasMoreElements()) {
    SearchResult sr = (SearchResult) answer.next();
    Attributes attrs = sr.getAttributes();
    if (attrs != null) {
     NamingEnumeration ae = attrs.getAll();
     Attribute attr = (Attribute) ae.next();
     NamingEnumeration e = attr.getAll();
     return (String) e.next();
    }
   }
  } catch (NamingException e) {
   System.out
     .println("Problem search_distinguishedName NamingException: " + e);
   return "error";
  }

  return "none";
 }

 private boolean mod_Pwd(String username, String password) {
  ModificationItem[] mods = new ModificationItem[1];
  String newQuotedPassword = "/"" + password + "/"";

  try {
   System.out.println("Start reset password");
   byte[] newUnicodePassword = newQuotedPassword.getBytes("UTF-16LE");
   mods[0] = new ModificationItem(DirContext.REPLACE_ATTRIBUTE,
     new BasicAttribute("unicodePwd", newUnicodePassword));
   ctx.modifyAttributes(username, mods);
   System.out.println("Finish reset password" + username);
  } catch (UnsupportedEncodingException e) {
   System.out.println("Problem mod_Pwd UnsupportedEncodingException: " + e);
   return false;
  } catch (NamingException e) {
   System.out.println("Problem mod_Pwd NamingException: " + e);
   return false;
  }

  return true;
 }

 public static void main(String args[]) {
  OpAD inst = new OpAD();
  inst.initial_Ldap();
  String username = inst.search_distinguishedName("testuser"); 
  inst.mod_Pwd(username, "1234AbcD");
  inst.close_Ldap();
  
 }

}