/** 生成的excel文件扩展名 */
    private static final String FileExt = "xls";

    @Inject
    DownloadGridExcelService downloadGridExcelService;

    @Ok("raw:application/ms-excel")
    @At("/downloadExcel")
    public Object downloadExcel(@Param("..") Map map, HttpServletResponse response) throws Exception {
        File f = null;
        try {
            String url = (String)map.get("sys_url");
            String fileName = downloadGridExcelService.refineFileName(DataTypeUtil.toNotNullString(map.get("sys_fileName"))) + "." + FileExt;
            String params = (String)map.get("sys_params");
            List<DownloadGridBean> dataList = Json.fromJsonAsList(DownloadGridBean.class, (String)map.get("sys_columnData"));
            f = downloadGridExcelService.createExcel(url, params, fileName, dataList);
            response.setHeader("content-disposition", "attachment;filename=" + java.net.URLEncoder.encode(fileName, "UTF-8"));
            response.setCharacterEncoding("utf-8");
            response.getWriter().write("<SCRIPT> alert('good'); </SCRIPT>");
            response.getWriter().close();
        } catch (Exception e) {
            log.error(e);
        }
        return f;
    }