yii 的单文件上传

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首先新建一个Model层，防止与现有的表单小部件的Model 冲突，然后再我们的Model里 写一个上传的方法 叫upload

另外为了验证文件的尺寸大小 我 们在model里写了一个限制文件大小的方法 checksize

如下所示

<?php
/**
 * Created by PhpStorm.
 * User: administor
 * Date: 2017/5/11
 * Time: 14:04
 */

namespace frontendmodels;

use yiiaseModel;
use yiiwidgetsActiveForm;
use yiiwebUploadedFile;

class Upload extends Model
{
    public $file;
    public $maxsize = 1024*1024*2;
    public $minsize = 1024*20;
    public function rules(){
        return[
            ['file','file','maxSize'=>1024*1024*2,'minSize'=>1024*20]
        ];
    }
    public function upload()
    {
        if ($this->validate()) {
            $this->file->saveAs('../../common/upload/' . $this->file->baseName . '.' . $this->file->extension);
            return true;
        } else {
            return false;
        }
    }
    public function checksize($size){
        if($size>$this->minsize && $size<$this->maxsize){
            return true;
        }else{
            return false;
        }
    }
}

接下来  是控制器层

我们使用前面的表单小部件的控制器和方法 因为有一个新的model引入 所以和前边比我们多了个引用和传值

同样的 我们在控制器里也调用了判断文件尺寸的方法 杜绝用户禁用js后引起的文件大小不符合规定

<?php
/**
 * Created by PhpStorm.
 * User:administor
 * Date: 2017/5/10
 * Time: 9:39
 */

namespace frontendcontrollers;
use yiiwebController;
use yii;
use db;
use frontendmodelsForm;
use frontendmodelsUpload;
use yiiwebUploadedFile;
    class LoginController extends Controller
    {
            public function actionIndex(){
                $sql = 'select kid,kname from exam_tiku';
                $data = yii::$app->db->createCommand($sql)->queryAll();
                $arr = Form::dataarr($data);
                //var_dump($arr);die;
                $model = new Form();
                $models = new Upload();

                return $this->render('index',['model'=>$model,'data'=>$arr,'models'=>$models]);
            }
            public function actionAdd(){
                $data = Yii::$app->request->post();
                $model = new Upload();

                if (Yii::$app->request->isPost) {
                    $model->file = UploadedFile::getInstance($model, 'file');
                    $filesize =  $model->file->size;
                    if($model->checksize($filesize)){
                        if ($model->upload()) {
                            // 文件上传成功
                            return;
                        }
                    }else{
                        echo "filesize is not right";
                    }

              }
            }
    }


接下来是view层

<?php
/**
 * Created by PhpStorm.
 * User: administor
 * Date: 2017/5/10
 * Time: 9:41
 */
use yiihelpersHtml;
use yiiwidgetsActiveForm;

$form = ActiveForm::begin([
    'id' => 'login-form',
    'options' => ['class' => 'form-horizontal','enctype'=>'multipart/form-data'],
    'action'=>'?r=login/add',
    'method'=>'post'
]) ?>
    <?= $form->field($model, 'name') ?>
    <?= $form->field($model, 'pwd')->passwordInput() ?>
    <?= $form->field($model, 'sex')->radioList(['0'=>'男','1'=>'女']) ?>
    <?= $form->field($model, 'hobby')->checkboxList(['basketball'=>'篮球','baseball'=>'棒球','swim'=>'游泳']) ?>
    <?= $form->field($models, 'file')->fileInput() ?>

<?= $form->field($model, 'age')->dropDownList($data,['prompt' => $data[3]]) ?>



    <div class="form-group">
        <div class="col-lg-offset-1 col-lg-11">
            <?= Html::submitButton('Login', ['class' => 'btn btn-primary']) ?>
        </div>
    </div>
<?php ActiveForm::end() ?>

注意 文件上传需要表单添加一个

'enctype'=>'multipart/form-data'这个属性

这样  文件上传的mvc三层就搭建完成了。

我们可以实现文件上传了  并且通过改变model层文件大小的限制实现上传文件大小的控制