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https://github.com/yiisoft/yii2/blob/master/docs/guide/input-file-upload.md
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持Devmax。