如何使用Symfony上传图片？

// src/Controller/UploadController.php

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;

class UploadController extends AbstractController
{
    /**
     * @Route("/upload", name="upload")
     */
    public function upload(Request $request)
    {
        $form = $this->createForm(UploadFormType::class);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $file = $form->get('image')->getData();
            $fileName = md5(uniqid()) . '.' . $file->guessExtension();

            // 配置文件上传目录
            $uploadDir = $this->getParameter('kernel.project_dir') . '/public/uploads';
            $file->move($uploadDir, $fileName);

            // 显示上传结果
            return $this->render('upload/success.html.twig', [
                'fileName' => $fileName,
            ]);
        }

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

{# templates/upload/form.html.twig #}

{% extends 'base.html.twig' %}

{% block body %}
    <h1>上传图片</h1>

    {{ form_start(form) }}
        {{ form_row(form.image) }}
        <button type="submit">上传</button>
    {{ form_end(form) }}
{% endblock %}

{# templates/upload/success.html.twig #}

{% extends 'base.html.twig' %}

{% block body %}
    <h1>上传成功</h1>

    <img src="{{ asset('uploads/' ~ fileName) }}" alt="Uploaded Image">
{% endblock %}