所以经过大量的研究，我找到了正确的方法。您需要使用入口点服务，并在防火墙配置中定义它。

此方法不会干扰在用于登录的防火墙配置中指定的默认页面设置。

---

守则

安全性。yml:

firewalls:
    main:
        entry_point: entry_point.user_login #or whatever you name your service
        pattern: ^/
        form_login:
        # ...

src/Acme/UserBundle/config/services.yml

services:
    entry_point.user_login:
        class: Acme'UserBundle'Service'LoginEntryPoint
        arguments: [ @router ] #I am going to use this for URL generation since I will be redirecting in my service

src/Acme/UserBundle/Service/LoginRetryPoint.php：

namespace Acme'UserBundle'Service;
use Symfony'Component'Security'Http'EntryPoint'AuthenticationEntryPointInterface,
    Symfony'Component'Security'Core'Exception'AuthenticationException,
    Symfony'Component'HttpFoundation'Request,
    Symfony'Component'HttpFoundation'RedirectResponse;
/**
 * When the user is not authenticated at all (i.e. when the security context has no token yet), 
 * the firewall's entry point will be called to start() the authentication process. 
 */
class LoginEntryPoint implements AuthenticationEntryPointInterface
{
    protected $router;
    public function __construct($router)
    {
        $this->router = $router;
    }
    /*
     * This method receives the current Request object and the exception by which the exception 
     * listener was triggered. 
     * 
     * The method should return a Response object
     */
    public function start(Request $request, AuthenticationException $authException = null)
    {
        $session = $request->getSession();
        // I am choosing to set a FlashBag message with my own custom message.
        // Alternatively, you could use AuthenticationException's generic message 
        // by calling $authException->getMessage()
        $session->getFlashBag()->add('warning', 'You must be logged in to access that page');
        return new RedirectResponse($this->router->generate('login'));
    }
}

login.html.trick:

{# bootstrap ready for your convenience ;] #}
{% if app.session.flashbag.has('warning') %}
    {% for flashMessage in app.session.flashbag.get('warning') %}
        <div class="alert alert-warning">
            <button type="button" class="close" data-dismiss="alert">&times;</button>
            {{ flashMessage }}
        </div>
    {% endfor %}
{% endif %}

资源：

• AuthenticationEntryPointInterface API
• 入口点文档
• 安全配置参考
• 如何自定义表单登录
• 为什么access_denied_handle不起作用-感谢cheesemacfly的提示

我认为kernel.exception侦听器和设置一个flash消息可以做到这一点。未测试的示例：

use Symfony'Component'HttpKernel'Event'GetResponseForExceptionEvent;
use Symfony'Component'HttpFoundation'Response;
use Symfony'Component'HttpFoundation'Session'SessionInterface;
use Symfony'Component'HttpKernel'Exception'AccessDeniedHttpException;
class My403ExceptionListener
{
    protected $session;
    public function __construct(SessionInterface $session)
    {
        $this->session = $session;
    }
    public function onKernelException(GetResponseForExceptionEvent $event)
    {
        $exception = $event->getException();
        if ($exception instanceof AccessDeniedHttpException) {
            $this->session->getFlashBag()->set('warning', 'You must login to access that page.');
        }
    }
}

真的不知道它是否有效，或者它是否是正确的。您可以将其注册为kernel.event_listener。或者，最好编写一个专用服务，并在防火墙配置中将其设置为access_denied_handler的参数。我认为有很多可能的方法。

难道不能只有两个登录路径吗？

例如，在安全配置中设置

form_login:
    login_path: /login_message

在您的登录控制器中

/**
 * @Template()
 * @Route("/notauthorized", name="login_message")
 */
 public function loginMessageAction()
 {
    return [];
 }

然后在您的登录信息.html.twg 中

<a href="{{ path('login') }}">You must login to access this page.</a>

我采用了不同的方法，在控制器中我抛出了新的AuthenticationException，在此之前，我在flashbag中添加了错误消息。

// Check if user is logged in.
if ($this->isGranted('IS_AUTHENTICATED_REMEMBERED') == FALSE) {
  $request->getSession()
    ->getFlashBag()
    ->add('error', "Please login to continue");
  throw new AuthenticationException();
}

并在登录树枝模板中显示消息。

{% for flash_message in app.session.flashBag.get('error') %}
  <div class="callout alert" role="alert">
    {{ flash_message }}
  </div>
{% endfor %}