Yii2使用表单上传文件

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# Yii2使用表单上传文件 \[ 2.0 版本 \] #

[ webclz][webclz]   2015-01-06 17:04:57   24483次浏览  [ 16条评论][16]   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

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

[webclz]: http://www.yiichina.com/user/27646
[16]: http://www.yiichina.com/tutorial/328#comments