Yii2使用表单上传文件的实例代码


            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http://github.com/yiisoft/yii2/blob/master/docs/guide/input-file-upload.md



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