Validator problem.

[EM_1984]

hello! I do a validator for my class login..
the problem is not know use the validators,
I have to make sure that the user and pass are the same values, otherwise I should give an error message.

package springapp.web;

import org.springframework.web.servlet.mvc.SimpleFormCont roller;
import org.springframework.web.servlet.mvc.Controller;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.view.RedirectView;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import springapp.service.PersonaManager;
import springapp.domain.Login;
import springapp.domain.Persona;
import springapp.domain.Prodotto;
import springapp.schede.User;
import springapp.service.ProdottoManager;
import springapp.service.ShoppingCart;

import java.io.IOException;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.HashMap;


public class LoginController extends SimpleFormController{

private PersonaManager personaManager;
private List<Persona> persone;
private Persona persona;



public LoginController() {
}





public ModelAndView onSubmit(Object command)
throws ServletException {

Login login = (Login) command;
String username_tmp = login.getUsername();
String password_tmp = login.getPassword();
persone = this.personaManager.getPersone();
persona = new Persona();

Map<String, Login> model = new HashMap<String, Login>();

model.put(getCommandName(), login);
int c=0;
int i = persone.size();
for (int j = 0; j<i; j++)
{
persona=persone.get(j);
persona.setAbilitato(false);
persone.get(j).setId("null");

if (username_tmp.equals(persona.getUsername()) && (password_tmp.equals(persona.getPassword())))
{
c=j+1;
persone.get(j).setAbilitato(true);
persone.get(j).setId(String.valueOf(c));

return new ModelAndView(new RedirectView(getSuccessView()));
}



}

return new ModelAndView(new RedirectView("home_page.htm"));
}



protected Object formBackingObject(HttpServletRequest request) throws ServletException {
Login login = new Login();


return login;
}


public void setPersonaManager(PersonaManager personaManager) {
this.personaManager = personaManager;
}

public PersonaManager getPersonaManager()
{
return personaManager;
}

}

[kolodrevskiy]

you must write something like LoginControllerValidator class which implements Validator.
make all your validations there.