Login with extra fields

Hi all..

I am newbie on Spring Security.. I am using 3.1.3 version.. I am not using the all spring framework.. only for security..

I need to know best way. or the most indicate way to handle the login with extra fields besides username and password.

My web project today log in using only username and password.. but I need some extra fields to authenticate together username and password.

I saw some blog's.. web sites talking about create form login filter.. others talking about create Custom UserDetails. so I am not sure the correctly solution to do this.

I want to do this by the most indicate way using Spring Security 3.1.3.

Please I would like someone tell the steps to do this.. like..

1 - Create this custom class.. that custom class..
2 - set this on some.xml
3 - do this.. do that..