yii框架中文件上传

1：在数据库中建立一张表(upload，我的表是这样的：

2:使用Gii生成model层；（切记要model层和控制器层一定要有 use yii\web\UploadedFile;控制器一定要调用model哦）

 <?php

 namespace app\models;
 use yii\web\UploadedFile;
 use Yii;

 /**
  * This is the model class for table "upload".
  *
  * @property integer $u_id
  * @property string $u_name
  * @property string $u_pwd
  * @property string $u_img
  */
 class Upload extends \yii\db\ActiveRecord
 {
     /**
      * @inheritdoc
      */
     public static function tableName()
     {
         return 'upload';
     }

     /**
      * @inheritdoc
      */
     public function rules()
     {
         return [
             [['u_name', 'u_pwd', 'u_img'], 'string', 'max' => 255]
         ];
     }

     /**
      * @inheritdoc
      */
     public function attributeLabels()
     {
         return [
             'u_id' => 'U ID',
             'u_name' => 'U Name',
             'u_pwd' => 'U Pwd',
             'u_img' => 'U Img',
         ];
     }
      public function upload(){
         //$this->p_photo->saveAs('uploads/' . $this->p_photo->baseName . '.' . $this->p_photo->extension);
         //return true;
         return $this->u_img->saveAs('upload/' . $this->u_img->baseName . '.' . $this->u_img->extension);


 }
 }

3：建立好uploadController.php控制器，在没有post接值的时候，进入views/upload/entry.php,显示视图层,至于views/upload/entry-confirm.php视图，是你接入值后要执行的程序，这里我没有用到这个视图，当接到表单的值之后我又自己生成了个方法；

 <?php
 namespace app\controllers;

 use Yii;
 use yii\filters\AccessControl;
 use yii\web\Controller;
 use yii\filters\VerbFilter;
 use app\models\LoginForm;
 use app\models\ContactForm;
 use yii\web\UploadedFile;
 use app\models\Upload;
 class UploadController extends Controller
 {
     public function actionIndex(){
         $model = new Upload();

         if ($model->load(Yii::$app->request->post()) && $model->validate()) {
             // 验证 $model 收到的数据

             // 做些有意义的事 ...

             return $this->render('entry-confirm', ['model' => $model]);
         } else {
             // 无论是初始化显示还是数据验证错误
             return $this->render('entry', ['model' => $model]);
         }

     }
     public function actionAdds()
     {
         $model = new Upload();
         $request = Yii::$app->request;
         //$post = $request->post();
         //print_r($data);
          $post=$request->post('Upload');
         $u_name = $post['u_name'];
         $u_pwd = $post['u_pwd'];
         //print_r($u_name);
         //在浏览器输出的值是 yii\web\UploadedFile Object ( [name] => 2.jpg [tempName] => C:\Windows\php3986.tmp
         // [type] => image/jpeg [size] => 216848 [error] => 0 )
          $arr =  $model->u_img = UploadedFile::getInstance($model,'u_img');
          //print_r($arr);
           if ($model->upload()) {
                 // 文件上传成功
                 $u_img = $arr->name;
                 //var_dump($u_img);
                  $connection = \Yii::$app->db;
             $result=$connection->createCommand()->insert('upload', [
                 'u_name' => $u_name,
                 'u_pwd' => $u_pwd,
                  'u_img' =>$u_img,
             ])->execute();
             if($result)
             {
               echo "添加成功";
             }
             else
             {
                 echo "添加失败";
             }
             }

     }

 }
 ?>

4：视图层显示

 <?php
 use yii\helpers\Html;
 use yii\widgets\ActiveForm;
 ?>
 <?php $form = ActiveForm::begin([
     'action' => ['upload/adds'],
     'method'=>'post',
     'options' => ['enctype' => 'multipart/form-data']
 ]); ?>

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

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

     <?=$form->field($model, 'u_img')->fileInput(['multiple'=>'multiple']);?>
     <div class="form-group">
         <?= Html::submitButton('Submit', ['class' => 'btn btn-primary']) ?>
     </div>

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

5：至于entry_form.PHP可以有，也可以不要它，因为上边我已经写了actionAdds()这个方法,这个就是当你接值成功列表显示的页面，可以这样写：

 <?php
 use yii\helpers\Html;
 ?>
 <p>You have entered the following information:</p>

 <ul>
     <li><label>Name</label>: <?= Html::encode($model->u_name) ?></li>
     <li><label>Email</label>: <?= Html::encode($model->u_pwd) ?></li>
 </ul>

 好了，就这些了，会有更多方法给大家分享的哦！<img alt="吐舌头" src="http://static.blog.csdn.net/xheditor/xheditor_emot/default/tongue.gif" />