springmvc 登录怎么跟数据库验证 springmvc怎么实现注解验证登录

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springmvc登录验证使用db校验：
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import UserBean;

@Repository
@Service
@Transactional(readOnly=true)
public class SimpleUserDetailsService implements UserDetailsService {

@Autowired
private UserDao userDAO;

private UserBean domainUser;

public UserDetails loadUserByUsername(String login)
throws UsernameNotFoundException {
domainUser = userDAO.getUser(login);

boolean enabled = true;
boolean disabled = false;
boolean accountNonExpired = true;
boolean accountExpired = false;
boolean credentialsNonExpired = true;
boolean credentialsExpired = false;
boolean accountNonLocked = true;
boolean accountLocked = false;

if (null != domainUser){
return new User(
domainUser.getUsername(), //getLogin(),
domainUser.getPassword(),
enabled,
accountNonExpired,
credentialsNonExpired,
accountNonLocked,
getAuthorities(domainUser.getIduser() ) );

} else {
return new User(
"**20**",
"**//**",
disabled,
accountExpired,
credentialsExpired,
accountLocked,
getAuthorities(-20 ) ) ;
}

}

public Collection<? extends GrantedAuthority> getAuthorities(Integer userid) {
List<GrantedAuthority> authList = getGrantedAuthorities(getRoles(userid));
return authList;
}

public List<String> getRoles(Integer userid) {

List<String> roles = new ArrayList<String>();
roles = userDAO.getUserRoles(userid);

return roles;
}

public static List<GrantedAuthority> getGrantedAuthorities(List<String> roles) {
List<GrantedAuthority> authorities = new ArrayList<GrantedAuthority>();

for (String role : roles) {
authorities.add(new SimpleGrantedAuthority(role));
}
return authorities;
}

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