使用Symfony 5返回文件时，控制器返回登录表单

use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\File\File;

public function downloadFile()
{
    $filePath = '/path/to/file.pdf'; // 替换为实际文件路径

    $file = new File($filePath);

    $response = new Response();
    $response->headers->set('Content-Type', 'application/pdf');
    $response->headers->set('Content-Disposition', 'attachment; filename="' . $file->getFilename() . '"');
    $response->setContent(file_get_contents($file->getPathname()));

    return $response;
}

use Symfony\Component\HttpFoundation\BinaryFileResponse;

public function downloadFile()
{
    $filePath = '/path/to/file.pdf'; // 替换为实际文件路径

    return new BinaryFileResponse($filePath);
}

use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\FormFactoryInterface;

public function loginForm(FormFactoryInterface $formFactory)
{
    $form = $formFactory->createBuilder()
        ->add('username', TextType::class)
        ->add('password', PasswordType::class)
        ->getForm();

    return $this->render('login.html.twig', [
        'form' => $form->createView(),
    ]);
}