修改下载文件路径

                }

                break;

            case self::DOWNLOAD_TYPE_RETURN_FILE_PATH:

                $f = $_SERVER['DOCUMENT_ROOT'] . "/tmp/data";

                if (!file_exists($f)) {

                    mkdir($f, 0777, true);

                }

                $f .= "/" . $filename;

                $objWriter->save($f);

                return $f;

                $filePath = BASE_PATH . '/public/upload/';

                !is_dir($filePath) && mkdir($filePath, 0777, true);

                $salt = md5(date("YmdHis") . '-' . rand(1, 300));

                $returnFilename = 'upload/' . $salt . '-' . $filename;

                $fileName = $filePath . $salt . '-' . $filename;

                $objWriter->save($fileName);

                return config('app_domain') . '/' . $returnFilename;

                break;

            default:

                throw new \Exception('不支持此种下载类型');