Yii+upload实现AJAX上传图片的方法

/**
* get ajax uploaded files.
*/
public function actiongetajax(){
    $model=new attachment();//加载附件模型
    $tmpfile  = cuploadedfile::getinstancebyname('image');//读取图像上传域,并使用系统上传组件上传
    $directroy = yii::app()->params['uploadpath'];//读取上传配置文件,我的配置是/uploads
    //创建文件存放路径
    $y     = date('y');
    $m     = date('m');
    $d     = date('d');
    $directroy = $directroy."/";
    $pathd = $directroy.$y."/".$m."/".$d."/";
    tool::makedir(dirname(yii::app()->basepath).$pathd); //创建文件夹,此处一定要加上dirname(yii::app()->basepath)不然可能会出错;
    if(is_object($tmpfile) && get_class($tmpfile)==='cuploadedfile'){
      $filename        = time().rand(0,9);
      $ext          = $tmpfile->extensionname;//上传文件的扩展名
      if($ext=='jpg'||$ext=='gif'||$ext=='png'){
          $big          = $pathd . $filename . '_600.' . $ext; //310缩略图
        $small         = $pathd . $filename . '_310.' . $ext; //310缩略图
        $thumb         = $pathd . $filename . '_100.' . $ext; //100缩略图
        $model->zat_thumb    = $thumb; //缩略图
      }
      $uploadfile       = $pathd . $filename . '.' . $ext;   //保存的路径
      $model->zat_url     = $pathd . $filename . '.' . $ext;   //重新赋值
      $model->zat_file_name  = $filename . '.' . $ext;        //文件名称
      $model->zat_title    = $tmpfile->name;            //文件标题
      $model->zat_file_type  = $tmpfile->type;            //文件类型
      $model->zat_file_size  = $tmpfile->size;            //文件大小
      $model->zat_image    = 2;
      $model->zat_ip     = yii::app()->request->userhostaddress; //上传ip
      //print_r($uploadfile);
    }
    if($model->save()){
      $tmpfile->saveas(dirname(yii::app()->basepath).$uploadfile);//保存到服务器
      if($ext=='jpg'||$ext=='gif'||$ext=='png'){
        $img = yii::app()->image->load(dirname(yii::app()->basepath).$uploadfile); //使用image-kohana图像处理库扩展
        $img->resize(600,600)->quality(85);
        $img->save(dirname(yii::app()->basepath).$big);//生成600缩略图
        $img->resize(310,310)->quality(85);
        $img->save(dirname(yii::app()->basepath).$small);//生成310缩略图
        $img->resize(100,100)->quality(85);
        $img->save(dirname(yii::app()->basepath).$thumb);//生成100缩略图
      }
      if($ext=='jpg'||$ext=='gif'||$ext=='png'){
        $str = json_encode(
          array(
            'upfile'=>array(
              'zat_id' => yii::app()->db->getlastinsertid(), //取插id
              'file' => $uploadfile,//原图
              'small' => $small,//310缩略图
              'thumb' => $thumb,//100缩略图
            )
          )
        );
      }else{
        $str = json_encode(
          array(
            'upfile'=>array(
              'zat_id' => yii::app()->db->getlastinsertid(),
              'file' => $uploadfile,
            )
          )
        );
      }
      echo $str;
    }
}

<input id="fileupload" type="file" name="image" multiple>
<script src="<?php echo yii::app()->baseurl;?>/js/jquery.ui.widget.js"></script>
<script src="<?php echo yii::app()->baseurl;?>/js/jquery.iframe-transport.js"></script>
<script src="<?php echo yii::app()->baseurl;?>/js/jquery.fileupload.js"></script>
<script>
$(function () {
  $('#fileupload').fileupload({
    datatype: 'json',
    url: '/attachment/getajax',
    success: function (json) {
        $('#memtype_zmt_pic').attr('value',json.upfile.file);
        $("#images").attr('src',json.upfile.file);
    }
  });
});
</script>