Yii2使用表单上传文件

Yii2使用表单上传文件 [ 2.0 版本 ]

 webclz  2015-01-06 17:04:57  24483次浏览  16条评论  56 9 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

<?phpuse 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：

<?phpuse 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]);    }}http://www.yiichina.com/tutorial/328