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Yii2利用表单进行文件上传的实例讲解

巴扎黑
Lepaskan: 2023-03-15 08:42:01
asal
1625 orang telah melayarinya

本篇文章主要介绍了Yii2使用表单上传文件的实例代码,小编觉得挺不错的,现在分享给大家,也给大家做个参考。一起跟随小编过来看看吧

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'],
    ];
  }
}
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再建立一个视图文件,内容如下


<?php
use yii\widgets\ActiveForm;
?>

<?php $form = ActiveForm::begin([&#39;options&#39; => [&#39;enctype&#39; => &#39;multipart/form-data&#39;]]) ?>

<?= $form->field($model, &#39;file&#39;)->fileInput() ?>

<button>Submit</button>

<?php ActiveForm::end() ?>
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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, &#39;file&#39;);

      if ($model->file && $model->validate()) {        
        $model->file->saveAs(&#39;uploads/&#39; . $model->file->baseName . &#39;.&#39; . $model->file->extension);
      }
    }

    return $this->render(&#39;upload&#39;, [&#39;model&#39; => $model]);
  }
}
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注意这里我们没有用model->load(...),而是用了UploadedFile::getInstance(...)。区别是后者不会执行$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 [
    [[&#39;file&#39;], &#39;file&#39;, &#39;skipOnEmpty&#39; => false],
  ];
}
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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 [
    [[&#39;file&#39;], &#39;file&#39;, &#39;extensions&#39; => &#39;jpg, png&#39;, &#39;mimeTypes&#39; => &#39;image/jpeg, image/png&#39;,],
  ];
}
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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 [
      [[&#39;file&#39;], &#39;file&#39;, &#39;maxFiles&#39; => 10], // <--- here!
    ];
  }
}
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View:


<?php
use yii\widgets\ActiveForm;

$form = ActiveForm::begin([&#39;options&#39; => [&#39;enctype&#39; => &#39;multipart/form-data&#39;]]);
?>

<?= $form->field($model, &#39;file[]&#39;)->fileInput([&#39;multiple&#39; => true]) ?>

  <button>Submit</button>

<?php ActiveForm::end(); ?>
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与单文件上传不同的是下面这句


$form->field($model, &#39;file[]&#39;)->fileInput([&#39;multiple&#39; => true])
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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, &#39;file&#39;);

      if ($model->file && $model->validate()) {
        foreach ($model->file as $file) {
          $file->saveAs(&#39;uploads/&#39; . $file->baseName . &#39;.&#39; . $file->extension);
        }
      }
    }

    return $this->render(&#39;upload&#39;, [&#39;model&#39; => $model]);
  }
}
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这样就可以实现多文件上传了。

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