Creating an Initial Context to a Directory
This example uses the JNDI/LDAP service provider to connect to an LDAP server on the local machine. 

 
 String url = "ldap://localhost/o=JNDITutorial";
 Hashtable env = new Hashtable();
 env.put(Context.INITIAL_CONTEXT_FACTORY,
   "com.sun.jndi.ldap.LdapCtxFactory");
 env.put(Context.PROVIDER_URL, url);
 try {
     DirContext ctx = new InitialDirContext(env);
 } catch (NamingException e) {
 }