[YII2] 文件上传类

 //测试文件上传类

    public function actionCreate()
     {
         $model = new Lvyou();

         $upload_model = new \app\models\UploadForm();  

         $post = Yii::$app->request->post();

         if (Yii::$app->request->isPost) {
             $upload_model->file = \yii\web\UploadedFile::getInstance($upload_model, 'file');
             if ($upload_model->file && $upload_model->validate()) {
                 $filename ='./../../uploads/' . $upload_model->file->baseName . '.' . $upload_model->file->extension;
                 $upload_model->file->saveAs($filename);
                 $post['Lvyou']['file'] = $filename;
                 // $ext=$model->file->extension;//上传文件后缀名
                 // $name=$model->file->baseName;//上传文件名
             }
         }
        // if (isset($filename)) {
        //      $post['Lvyou']['file'] = $filename;
        //  }else{
        //      $post['Lvyou']['file']='他是不是没上传图片呀';
        //  }

         if ($model->load($post) && $model->save()) {
             return $this->redirect(['view', 'id' => $model->id]);
         } else {
             return $this->render('create', [
                 'model' => $model,
                 'upload_model'=> $upload_model,
             ]);
         }

     }

 //视图层

 一键生成的在index

     <?= GridView::widget([
         'dataProvider' => $dataProvider,
         'filterModel' => $searchModel,
         'columns' => [
             ['class' => 'yii\grid\SerialColumn'],

             'id',
             'file'=>[
                 'attribute'=>'file',
                 'format' => ['image',['width'=>'100','height'=>'80',]],
             ],

             ['class' => 'yii\grid\ActionColumn'],
         ],
     ]); ?>

 　　在_form

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

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

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

model层 UploadForm文件

 <?php
 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'],
         ];
     }
 }