magento 自定义模块使用uploader上传文件

1、在edit/form.php中添加代码：
addField('images', 'note', array(
        'label'     => Mage::helper('review')->__('Review Image'),
        //'required'  => true,
        'name'      => 'images',
        'text'      => $this->getLayout()->createBlock('xreview/adminhtml_review_image_upload')->_toHtml()，
       ));
?>
2、新建block：silk/xreview/adminhtml/review/image/upload.php
setTemplate('review/image/upload.phtml');
    }
 
    protected function _prepareLayout() {
 
                //加载Uploader插件的js
        $this->getLayout()->getBlock('head')->addJs('lib/flex.js');
        $this->getLayout()->getBlock('head')->addJs('mage/adminhtml/flexuploader.js');
        $this->getLayout()->getBlock('head')->addJs('lib/FABridge.js');
 
        // 添加Mage_Adminhtml_Block_Media_Uploader子块Block
        $this->setChild('uploader', $this->getLayout()->createBlock('adminhtml/media_uploader'));
        $this->getChild('uploader')->getConfig()
            // 文件上传处理action
            ->setUrl(Mage::getModel('adminhtml/url')->addSessionParam()->getUrl('xreview/adminhtml_xreview/upload'))
            ->setFileField('review_image')
            ->setFilters(array(
                'images' => array(
                    'label' => Mage::helper('adminhtml')->__('Images (.gif, .jpg, .png)'),
                    'files' => array('*.gif', '*.jpg','*.jpeg', '*.png')
                )
            ));
        return parent::_prepareLayout();
    }
}
?>
3、上一步，声明了blcok对应的phtml,所以新建design/adminhtml/default/default/template/review/image/upload.phtml：
        getChildHtml('uploader')?>
以上步骤完成以后，就可以看见与产品edit页面image中的2个按钮了
4、新建controller:silk/xreview/controllers/adminhtml/xreviewController.php
setAllowedExtensions(array('jpg','jpeg','gif','png'));
            $uploader->setAllowRenameFiles(true);
            $uploader->setFilesDispersion(true);
            $result = $uploader->save($this->getBaseTmpMediaPath());
            Mage::dispatchEvent('catalog_product_gallery_upload_image_after', array(
                'result' => $result,
                'action' => $this
            ));
 
            $result['tmp_name'] = str_replace(DS, "/", $result['tmp_name']);
            $result['path'] = str_replace(DS, "/", $result['path']);
 
            $result['url'] =$this->getTmpMediaUrl($result['file']);
            $result['file'] = $result['file'];
            $result['cookie'] = array(
                'name'     => session_name(),
                'value'    => $this->_getSession()->getSessionId(),
                'lifetime' => $this->_getSession()->getCookieLifetime(),
                'path'     => $this->_getSession()->getCookiePath(),
                'domain'   => $this->_getSession()->getCookieDomain()
            );
 
        } catch (Exception $e) {
            $result = array(
                'error' => $e->getMessage(),
                'errorcode' => $e->getCode());
        }
        //Mage::log($result,null,'cookie.log');
        $this->getResponse()->setBody(Mage::helper('core')->jsonEncode($result));
    }
 
    private function getBaseTmpMediaPath() {
        return Mage::getBaseDir('media') . DS . 'review';
    }
 
    private function getTmpMediaUrl($file) {
        $file = str_replace(DS, '/', $file);
 
        if (substr($file, 0, 1) == '/') {
            $file = substr($file, 1);
        }
        return  Mage::getBaseUrl('media') . 'review/'. $file;
    }
}
?>
5、如何处理action的json数据，在upload.phtml中，加入下面的js: