symfony3.4中根据角色不同跳转不同页面功能

#路径：app\config\security.yml
security:
    # ...
    access_control:
        - { path: ^/admin, roles: ROLE_ADMIN, requires_channel: https, host: admin.example.com }
        - { path: ^/user, roles: ROLE_USER, requires_channel: https, host: www.example.com }
    firewalls:
        firewall_name:
            # ...
            form_login:
                # ...
                default_target_path: /user/dashboard
                always_use_default_target_path: true
                success_handler: app.authentication_handler
    # ...

//AppBundle\Handler\AuthenticationHandler
use Symfony\Component\Security\Http\Authentication\AuthenticationSuccessHandlerInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
class AuthenticationHandler implements AuthenticationSuccessHandlerInterface
{
    private $router;
    public function __construct(UrlGeneratorInterface $router)
    {
        $this->router = $router;
    }
    public function onAuthenticationSuccess(Request $request, TokenInterface $token)
    {
        $roles = $token->getUser()->getRoles();
        if (in_array('ROLE_ADMIN', $roles)) {
            // 生成管理员页面的 URL
            $url = $this->router->generate('admin_dashboard');
        } else {
            // 生成普通用户页面的 URL
            $url = $this->router->generate('user_dashboard');
        }
        return new RedirectResponse($url);
    }
}

# services.yml
services:
    app.authentication_handler:
        class: AppBundle\Handler\AuthenticationHandler
        arguments:
            - '@router'