Autenticazione su LDAP tramite Active Directory con richiesta parametri

import java.io.BufferedReader;
import java.io.InputStreamReader;
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.SearchControls;
import javax.naming.directory.SearchResult;
import javax.naming.ldap.InitialLdapContext;
import javax.naming.ldap.LdapContext;
public class LDAPTest
{
static class LDAP
{
static String ATTRIBUTE_FOR_USER = "sAMAccountName";
@SuppressWarnings("unchecked")
public Attributes authenticateUser(String username, String password, String _domain, String host, String dn)
{
String returnedAtts[] ={ "sn", "givenName", "mail" , "company" , "department" };
String searchFilter = "(&(objectClass=user)(" + ATTRIBUTE_FOR_USER + "=" + username + "))";
//Create the search controls
SearchControls searchCtls = new SearchControls();
searchCtls.setReturningAttributes(returnedAtts);
//Specify the search scope
searchCtls.setSearchScope(SearchControls.SUBTREE_SCOPE);
String searchBase = dn;
Hashtable environment = new Hashtable();
environment.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
//Using starndard Port, check your instalation
environment.put(Context.PROVIDER_URL, "ldap://" + host + ":389");
environment.put(Context.SECURITY_AUTHENTICATION, "simple");
environment.put(Context.SECURITY_PRINCIPAL, username + "@" + _domain);
environment.put(Context.SECURITY_CREDENTIALS, password);
LdapContext ctxGC = null;
try
{
ctxGC = new InitialLdapContext(environment, null);
// Search for objects in the GC using the filter
NamingEnumeration answer = ctxGC.search(searchBase, searchFilter, searchCtls);
while (answer.hasMoreElements())
{
SearchResult sr = (SearchResult)answer.next();
Attributes attrs = sr.getAttributes();
if (attrs != null)
{
return attrs;
}
}
}
catch (NamingException e)
{
System.out.println("Just reporting error");
e.printStackTrace();
}
return null;
}
}
public static void main(String[] args) throws Exception
{

LDAP ldap = new LDAP();

String username = "user";
String password = "pwd";


Attributes att = ldap.authenticateUser(username, password, "dominio.estensione", "ip_addr", "DC=dominio,DC=estensione");
if (att == null)
{
System.out.println("Sorry your use is invalid or password incorrect");
}
else
{
String s = att.get("department").toString();
System.out.println("DEPARTMENT=" + s);

NamingEnumeration all = att.getAll();
int i = 1;
while(all.hasMore()){
System.out.println("ATTR "+i+" "+all.next().toString());
i++;
}

}
}
}