An example of a file upload with Symfony2

DefaultController.php

<?php

namespace Martial\UploadBundle\Controller;

use Martial\UploadBundle\Entity\Image;
use Martial\UploadBundle\Form\Type\ImageType;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;

class DefaultController extends Controller
{
    public function indexAction()
    {
        $form = $this->createForm(new ImageType(), new Image());

        return $this->render('MartialUploadBundle:Default:index.html.twig', array('form' => $form->createView()));
    }

    public function handleAction()
    {
        $request = $this->get('request');
        $image = new Image();
        $form = $this->createForm(new ImageType(), $image);
        $form->handleRequest($request);

        if ($form->isValid()) {
            $file = $form['image']->getData();
            $extension = $file->guessExtension();
            $targetDirectory = '/target/path/';

            if (!$extension) {
                $extension = 'bin';
            }

            $file->move($targetDirectory, rand(1, 99999) . '.' . $extension);
        }

        return $this->redirect($this->generateUrl('martial_upload_homepage'));
    }
}

Image.php

<?php

namespace Martial\UploadBundle\Entity;

class Image
{
    /**
     * @var string
     */
    private $image;

    /**
     * @param string $image
     */
    public function setImage($image)
    {
        $this->image = $image;
    }

    /**
     * @return string
     */
    public function getImage()
    {
        return $this->image;
    }
}

ImageType.php

<?php

namespace Martial\UploadBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;

class ImageType extends AbstractType
{
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options = array())
    {
        $builder->add('image', 'file');
    }

    /**
     * @param OptionsResolverInterface $resolver
     */
    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(
            array('data_class' => '\Martial\UploadBundle\Entity\Image')
        );
    }

    /**
     * Returns the name of this type.
     *
     * @return string The name of this type
     */
    public function getName()
    {
        return 'image_form';
    }
}

index.html.twig

{% extends "::base.html.twig" %}

{% block body %}
    {% for flashMessage in app.session.flashbag.get('notice') %}
        <div class="flash-notice">
            {{ flashMessage }}
        </div>
    {% endfor %}

    <h1>Upload image</h1>

    <form action="{{ url("martial_upload_handle") }}" method="post" enctype="multipart/form-data">
        <p>
            {{ form_label(form.image) }}<br />
            {{ form_widget(form.image) }}
        </p>
        <p>
            {{ form_rest(form) }}
            <input type="submit" value="Send" />
        </p>
    </form>
{% endblock %}

routing.yml

martial_upload_homepage:
    pattern:  /
    defaults: { _controller: MartialUploadBundle:Default:index }

martial_upload_handle:
    pattern:  /upload
    defaults: { _controller: MartialUploadBundle:Default:handle }

Merci!!!!!