PHPExcel读取excel文件并保存成html文件

public function index()
    {
        $els = new PHPExcel();
        $filename = FCPATH . 'xls/aaa.xls';
        $obj = new \PHPExcel_Reader_Excel5();
        $nn = $obj->load($filename);
        $htmlobj = new \PHPExcel_Writer_HTML($nn);

        $htmlobj->save(FCPATH . 'xls/bbb.html');
    }