public function _upload($order_id, $url)
 {
     $config = C('UPLOAD_TYPE_CONFIG');
     $config['domain'] = '7xlf9w.com2.z0.glb.qiniucdn.com';
     $config['bucket'] = 'zjfq-contract';
     $qiniu = new \Think\Upload\Driver\Qiniu\QiniuStorage($config);
     $upfile = array('name' => 'file', 'fileName' => $order_id . '.pdf', 'fileBody' => file_get_contents($url));
     $result = $qiniu->upload([], $upfile);
     if ($result === false) {
         $this->error = $qiniu->errorStr;
         return false;
     }
     return $qiniu->downlink($upfile['fileName']);
 }