文件池

或者直接输出：

@At("/export/?")
    @Ok("void")
    public void export(String id, HttpServletResponse response) {
        try {
            J4EConf j4eConf = J4EConf.from(Yc_activity_sign.class);
            List<J4EColumn> jcols = j4eConf.getColumns();
            for (J4EColumn j4eColumn : jcols) {
                if ("opBy".equals(j4eColumn.getFieldName()) || "opAt".equals(j4eColumn.getFieldName()) || "delFlag".equals(j4eColumn.getFieldName())) {
                    j4eColumn.setIgnore(true);
                }
            }
            List<Yc_activity_sign> list = ycActivitySignService.query(Cnd.where("activityId", "=", id));
            OutputStream out = response.getOutputStream();
            response.addHeader("content-type", "application/shlnd.ms-excel;charset=utf-8");
            response.addHeader("content-disposition", "attachment; filename=activity_detail.xls");
            J4E.toExcel(out, list, j4eConf);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }