<form action="<?php echo $this->createUrl('/upload/default/upload/');?>" method="post" enctype="multipart/form-data">

 <input type="file" name="file"/>

 <input type="hidden" name="dir" value="<?php echo Yii::app()->controller->currentDir?>"/>

 <input type="submit" value="Upload Image"/>

 </form>

 public function actionUpload()

 {

 $this->currentDir = isset($_REQUEST['dir']) ? $_REQUEST['dir'] : '';

 $image = CUploadedFile::getInstanceByName('file');

 $name = $this->uploadPath.'/'.$this->currentDir.'/'.$image->name;

 $image->saveAs($name);

 $this->redirect(array('index','dir'=>$this->currentDir));

 }

关于CUploadedFile类的使用

通过 CUploadedFile::getInstance($model,'album_image');
或 $attach = CUploadedFile::getInstanceByName($inputFileName);

获取的对象$attach对象，有以下几个属性：
name
size
type
tempName

error
extensionName
hasError