webclz 2015-01-06 17:04:57 62422次浏览 22条评论 76 12 0

Yii2 用表单上传文件经常用到的,该怎样上传呢?

1、单个文件上传

首先建立一个模型 models/UploadForm.php,内容如下

namespace app\models;

use yii\base\Model;
use yii\web\UploadedFile;

/**
 * UploadForm is the model behind the upload form.
 */
class UploadForm extends Model
{
    /**
     * @var UploadedFile file attribute
     */
    public $file;

    /**
     * @return array the validation rules.
     */
    public function rules()
    {
        return [
            [['file'], 'file'],
        ];
    }
}

再建立一个视图文件,内容如下

<?php
use yii\widgets\ActiveForm;
?>

<?php $form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]) ?>

<?= $form->field($model, 'file')->fileInput() ?>

<button>Submit</button>

<?php ActiveForm::end() ?>

最后建立控制器文件,内容如下

namespace app\controllers;

use Yii;
use yii\web\Controller;
use app\models\UploadForm;
use yii\web\UploadedFile;

class SiteController extends Controller
{
    public function actionUpload()
    {
        $model = new UploadForm();

        if (Yii::$app->request->isPost) {
            $model->file = UploadedFile::getInstance($model, 'file');

            if ($model->file && $model->validate()) {                
                $model->file->saveAs('uploads/' . $model->file->baseName . '.' . $model->file->extension);
            }
        }

        return $this->render('upload', ['model' => $model]);
    }
}

注意这里我们没有用model->load(...),而是用了UploadedFile::getInstance(...)。区别是后者不会执行$model->validate(),所以需要手动的去执行$model->validate()来检验数据的合法性。如果检验通过了,上传的文件保存在uploads文件夹下,即web目录下的uploads里。

一些可选的配置选项
上传文件不能为空

public function rules()
{
    return [
        [['file'], 'file', 'skipOnEmpty' => false],
    ];
}

上传类型,不仅可以根据扩展名检验,还可以根据文件的内容进行检验

public function rules()
{
    return [
        [['file'], 'file', 'extensions' => 'jpg, png', 'mimeTypes' => 'image/jpeg, image/png',],
    ];
}

2、多文件上传

如果你想一次上传多个文件,只需调节几个参数就可以达到目的

Model:

class UploadForm extends Model
{
    /**
     * @var UploadedFile|Null file attribute
     */
    public $file;

    /**
     * @return array the validation rules.
     */
    public function rules()
    {
        return [
            [['file'], 'file', 'maxFiles' => 10], // <--- here!
        ];
    }
}

View:

<?php
use yii\widgets\ActiveForm;

$form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]);
?>

<?= $form->field($model, 'file[]')->fileInput(['multiple' => true]) ?>

    <button>Submit</button>

<?php ActiveForm::end(); ?>

与单文件上传不同的是下面这句

$form->field($model, 'file[]')->fileInput(['multiple' => true])

Controller:

namespace app\controllers;

use Yii;
use yii\web\Controller;
use app\models\UploadForm;
use yii\web\UploadedFile;

class SiteController extends Controller
{
    public function actionUpload()
    {
        $model = new UploadForm();

        if (Yii::$app->request->isPost) {
            $model->file = UploadedFile::getInstances($model, 'file');

            if ($model->file && $model->validate()) {
                foreach ($model->file as $file) {
                    $file->saveAs('uploads/' . $file->baseName . '.' . $file->extension);
                }
            }
        }

        return $this->render('upload', ['model' => $model]);
    }
}

这样就可以实现多文件上传了。
参考 https://github.com/yiisoft/yii2/blob/master/docs/guide/input-file-upload.md

觉得很赞
  • 评论于 2018-01-10 18:59 举报

    我可以获取到多图片,但是保存的时候只保存进入了一张图,foreach里边打印的图片也是两个的,saveAs保存的时候是一个,麻烦问一下是什么问题

  • 评论于 2018-04-02 16:35 举报

    我按照例子的代码就是实现不了文件上传,大家知道为啥吗?

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