yii文件上传

页面 
------------------------------------------------- 

<?php $form=$this->beginWidget('CActiveForm', array(
        'id'=>'add-form',
        'enableClientValidation'=>true,
        'clientOptions'=>array( 'validateOnSubmit'=>true,),
        'htmlOptions'=>array('enctype'=>'multipart/form-data'),
    ));
?>
    <table>
        <tr>
            <td width="20%">
                <b>ファイルパス:</b>&nbsp;&nbsp;<font color="red">*</font>
            </td>
            <td width="80%">
                <?php echo CHtml::activeFileField($model, 'file'); ?>
                <?php echo $form->error($model,'file');?>
            </td>
        </tr>
    </table>

    <table>
        <tr>
            <td>
                <?php echo CHtml::button('上传', array('submit' => array('downfiles/upload'))); ?>
            </td>
        </tr>
    </table>

Model 
------------------------------------------------- 

public function rules()
{
    return array(

        array('file', 'file','allowEmpty'=>true ,
                'types'=>'jpg, gif, png, doc, txt',
                'maxSize'=>1024 * 1024 * 10, // 10MB
                'tooLarge'=>'The file was larger than 10MB. Please upload a smaller file.',
            ),
    );
}

上传 
------------------------------------------------- 

public function actionUpload(){

    $model = new DownFiles();

    if(isset($_POST["DownFiles"])){

        $model->attributes=$_POST['DownFiles'];

        $file = CUploadedFile :: getInstance($model, 'file');

        if(is_null($file)){
            yii::app ()->user->setFlash('failed', '请选择上传文件');
            $this->render('upload', array('model' => $model));
            return ;
        }

        if (is_object($file) && get_class($file) == 'CUploadedFile') {

            Yii::log("File Name : "  . $file->getName() );

            // 文件类型
            $model->fileType = strtolower($file->getExtensionName());

            // 存储文件名
            $newFileName = date('YmdHis') . '_' . rand(1000, 9999) . '.' . $model->fileType;
            // 服务器端存储路径
            $newFilepath = Yii::app()->params['upload_folder'] . $newFileName;

            // 上传文件名
            $model->fileName = $file->getName();
            // 文件类型 （application/x-msdownload、application/pdf、application/octet-stream）
            $model->fileType = $file->getType();
            // 文件大小
            $model->fileSize = $file->getSize();

            if ($model->validate()  && $model->save()){
                // 将文件存在在服务器端
                $file->saveAs($newFilepath);

                yii::app ()->user->setFlash('successed', '上传成功');
            } else {
                yii::app ()->user->setFlash('failed', '上传失败');
            }

        } else {
            yii::app ()->user->setFlash('failed', '上传失败');
        }

        $this->render('upload', array('model' => $model));

    }else{
        $this->render('upload', array(
            'model' => $model,
        ));
    }

}

文件 
------------------------------------------------- 

public function actionDownload(){

    if (isset($_GET["id"])) {
        $id = $_GET["id"];

        $model = DownFiles::model()->find('id =:id', array('id' => $id));

        if ($model == null) {
            throw new CHttpException ('500', '文件不存在');
        } else {
            // 服务器端文件的路径
            $fileName = $model->saveFilePath ;

            if (file_exists($fileName)){
                yii::app ()->request->sendFile ($model->fileName,  file_get_contents ($fileName));
            }
        }
    }
}