How to obtain thinkphp3.2.3 upload file path

//  导入excel
     public function upload(){       $upload = new \Think\Upload();// 实例化上传类
       $upload->maxSize   =     3145728 ;// 设置附件上传大小
       $upload->exts      =     array('xlsx','xls');// 设置附件上传类型
       $upload->rootPath  =      './Uploads/'; // 设置附件上传根目录
       $upload->savePath  =      ''; // 设置附件上传（子）目录
       // 上传文件
       $info   =   $upload->upload();       if(!$info) {// 上传错误提示错误信息
           $this->error($upload->getError());
       }else{// 上传成功 获取上传文件信息
           foreach($info as $file){               $FilePath = $file['savePath'].$file['savename'];
           }
           dump($FilePath);
       }
     }

$upload->savePath 或 $upload->rootPath