[YII2] 文件上传类

//测试文件上传类

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

        $upload_model = new appmodelsUploadForm();  

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

        if (Yii::$app->request->isPost) {
            $upload_model->file = yiiwebUploadedFile::getInstance($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' => 'yiigridSerialColumn'],

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

            ['class' => 'yiigridActionColumn'],
        ],
    ]); ?>

　　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 appmodels;


use yiiaseModel;
use yiiwebUploadedFile;

/**
* 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'],
        ];
    }
}