yii使用activeFileField控件实现上传文件与图片的方

<?php $form=$this->beginWidget('CActiveForm', array(
'id'=>'books-form',
'enableAjaxValidation'=>false,
'htmlOptions'=>array('enctype'=>'multipart/form-data'),
));
?>

<div class="row">
<?php echo $form->labelEx($model,'BookImg'); ?>
<?php echo CHtml::activeFileField($model,'BookImg'); ?>
<?php echo $form->error($model,'BookImg'); ?>
</div>

<div class="row">
<?php echo '图片预览' ?>
<?php echo '<img src="http://.XXXX./'.$model->BookImg.'" style="width:200px;height:300px;"/>'; ?>
</div>

if($model->save())
{
$image=CUploadedFile::getInstance($model,'BookImg');
 if (is_object($image) && get_class($image)==='CUploadedFile')
 {
 $image->saveAs("D:/aaa/aa.jpg");//路径必须真实存在，并且如果是linux系统，必须有修改权限
 }
$this->redirect(array('view','id'=>$model->BookId));
}

array('BookImg', 'file','allowEmpty'=>true,
'types'=>'jpg, gif, png',
'maxSize'=>1024  1024  1, // 1MB
'tooLarge'=>'The file was larger than 1MB. Please upload a smaller file.',
)