Custom login control class Demo

public class UserDetailServiceImpl implements UserDetailsService {

 // Use xml to inject
 private SellerService sellerService;

 public void setSellerService(SellerServiceService) {< br /> this.sellerService = sellerService;
 }

 @Override
 public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
 if (username == null || "".equals(username)) {
 return null;
 }
 Seller seller = sellerService.findByName(username);
 if(seller != null) {
 List grantedAuthorities = new ArrayList<>();
 GrantedAuthority grantedAuthority = new SimpleGrantedAuthority("ROLE_SELLER");
 grantedAuthorities.add(grantedAuthority);
 return new User(username, seller.getPassword(), grantedAuthorities);
 }
 return null;
 }
}

< p>