LDAP Connection Sample Code

package com.ldap;

import java.util.Hashtable;

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

public class LDAPConnectionSampleCode {
public static String usersContainer = "cn=users,DC=domainName,DC=companyName,DC=com";

    public static void main(String args[]){

	    Hashtable<String,String> env = new Hashtable<String,String>();
	    env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
	    env.put(Context.PROVIDER_URL, "ldap://domainName");
	    env.put( Context.SECURITY_PRINCIPAL, "domainName\\userId" );
	    env.put( Context.SECURITY_CREDENTIALS, "password" );

    try {
        DirContext ctx = new InitialDirContext(env);

        SearchControls ctls = new SearchControls();
        /*String[] attrIDs = {"cn"};
        ctls.setReturningAttributes(attrIDs);*/
        ctls.setSearchScope(SearchControls.ONELEVEL_SCOPE);
        /*ctls.setCountLimit(0);
        ctls.setTimeLimit(0);*/

        SearchControls sc = new SearchControls();
        String[] attributeFilter = { "cn", "mail" };
        sc.setReturningAttributes(attributeFilter);
        sc.setSearchScope(SearchControls.SUBTREE_SCOPE);

        String base = "ou=People";
        String filter = "(&(sn=W*)(l=Criteria*))";

        NamingEnumeration answer = ctx.search( usersContainer, "(objectclass=group)",ctls );
        while(answer.hasMore()) {
            SearchResult rslt = (SearchResult)answer.next();
            Attributes attrs = rslt.getAttributes();
            System.out.println(attrs.get("cn"));
        }

        while (answer.hasMore()) {
            SearchResult sr = (SearchResult) answer.next();
            Attributes attrs = sr.getAttributes();

            Attribute attr = attrs.get("cn");
            System.out.print(attr.get() + ": ");
            attr = attrs.get("mail");
            System.out.println(attr.get());
          }

        ctx.close();

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

	}
}