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 appmodels;use yiiaseModel;use yiiwebUploadedFile;/** * 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

<?phpuse yiiwidgetsActiveForm;?><?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 appcontrollers;use Yii;use yiiwebController;use appmodelsUploadForm;use yiiwebUploadedFile;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：

<?phpuse yiiwidgetsActiveForm;$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 appcontrollers;use Yii;use yiiwebController;use appmodelsUploadForm;use yiiwebUploadedFile;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https://github.com/yiisoft/yii2/blob/master/docs/guide/input-file-upload.md

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