钉钉消息通知格式

OapiMessageCorpconversationAsyncsendV2Request.Msg msg = new OapiMessageCorpconversationAsyncsendV2Request.Msg();
        msg.setActionCard(new OapiMessageCorpconversationAsyncsendV2Request.ActionCard());
        //首屏会话透出的展示内容
        msg.getActionCard().setTitle("有新的培训通知，请查收");
        //消息内容
        msg.getActionCard().setMarkdown("### 培训通知 \n # 培训通知 \n ## 培训通知 \n  培训通知 \n*  培训通知");
        //跳转链接提示
        msg.getActionCard().setSingleTitle("点击查看培训内容");
        // msg.getActionCard().setSingleUrl("eapp://page/cultivate/cultivate");
        //E应用跳转链接
        msg.getActionCard().setSingleUrl("eapp://page/index/index");
        //消息类型
        msg.setMsgtype("action_card");
        request.setMsg(msg);

钉钉开发文档

https://open-doc.dingtalk.com/microapp/serverapi2/al5qyp