如何上传文件

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// src/Entity/Product.php
namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

class Product
{
    // ...

    #[ORM\Column(type: 'string')]
    private string $brochureFilename;

    public function getBrochureFilename(): string
    {
        return $this->brochureFilename;
    }

    public function setBrochureFilename(string $brochureFilename): self
    {
        $this->brochureFilename = $brochureFilename;

        return $this;
    }
}

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// src/Form/ProductType.php
namespace App\Form;

use App\Entity\Product;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\FileType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Validator\Constraints\File;

class ProductType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder
            // ...
            ->add('brochure', FileType::class, [
                'label' => 'Brochure (PDF file)',

                // unmapped means that this field is not associated to any entity property
                'mapped' => false,

                // make it optional so you don't have to re-upload the PDF file
                // every time you edit the Product details
                'required' => false,

                // unmapped fields can't define their validation using attributes
                // in the associated entity, so you can use the PHP constraint classes
                'constraints' => [
                    new File([
                        'maxSize' => '1024k',
                        'mimeTypes' => [
                            'application/pdf',
                            'application/x-pdf',
                        ],
                        'mimeTypesMessage' => 'Please upload a valid PDF document',
                    ])
                ],
            ])
            // ...
        ;
    }

    public function configureOptions(OptionsResolver $resolver): void
    {
        $resolver->setDefaults([
            'data_class' => Product::class,
        ]);
    }
}

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// src/Controller/ProductController.php
namespace App\Controller;

use App\Entity\Product;
use App\Form\ProductType;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\DependencyInjection\Attribute\Autowire;
use Symfony\Component\HttpFoundation\File\Exception\FileException;
use Symfony\Component\HttpFoundation\File\UploadedFile;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;
use Symfony\Component\String\Slugger\SluggerInterface;

class ProductController extends AbstractController
{
    #[Route('/product/new', name: 'app_product_new')]
    public function new(
        Request $request,
        SluggerInterface $slugger,
        #[Autowire('%kernel.project_dir%/public/uploads/brochures')] string $brochuresDirectory
    ): Response
    {
        $product = new Product();
        $form = $this->createForm(ProductType::class, $product);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            /** @var UploadedFile $brochureFile */
            $brochureFile = $form->get('brochure')->getData();

            // this condition is needed because the 'brochure' field is not required
            // so the PDF file must be processed only when a file is uploaded
            if ($brochureFile) {
                $originalFilename = pathinfo($brochureFile->getClientOriginalName(), PATHINFO_FILENAME);
                // this is needed to safely include the file name as part of the URL
                $safeFilename = $slugger->slug($originalFilename);
                $newFilename = $safeFilename.'-'.uniqid().'.'.$brochureFile->guessExtension();

                // Move the file to the directory where brochures are stored
                try {
                    $brochureFile->move($brochuresDirectory, $newFilename);
                } catch (FileException $e) {
                    // ... handle exception if something happens during file upload
                }

                // updates the 'brochureFilename' property to store the PDF file name
                // instead of its contents
                $product->setBrochureFilename($newFilename);
            }

            // ... persist the $product variable or any other work

            return $this->redirectToRoute('app_product_list');
        }

        return $this->render('product/new.html.twig', [
            'form' => $form,
        ]);
    }
}