등록 후 Symfony에서 프로그래밍 방식으로 사용자를 로그인하는 방법은 무엇입니까?

<code class="php">use Symfony\Component\EventDispatcher\EventDispatcher,
    Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken,
    Symfony\Component\Security\Http\Event\InteractiveLoginEvent;

public function registerAction()
{
    // ...
    if ($this->get("request")->getMethod() == "POST")
    {
        // ... Perform any password setting here
        $em->persist($user);
        $em->flush();

        // Obtain the user's roles
        $roles = $user->getRoles();

        // Create the authentication token
        $token = new UsernamePasswordToken($user, $user->getPassword(), "public", $roles);

        // Set the token in the security token storage
        $this->get("security.token_storage")->setToken($token);

        // Trigger the interactive login event
        $event = new InteractiveLoginEvent($request, $token);
        $this->get("event_dispatcher")->dispatch("security.interactive_login", $event);

        // ... Redirect the user as desired
    }
}</code>

access_control:
    - { path: ^/user/login, roles: IS_AUTHENTICATED_ANONYMOUSLY }
    - { path: ^/admin/login, roles: IS_AUTHENTICATED_ANONYMOUSLY }