curl 'https://oapi.dingtalk.com/robot/send?access_token=xxxxxxxx' \
-H 'Content-Type: application/json' \ 
-d '{"msgtype": "text","text": {"content":"嗨，我來啦"}}'

    /**
     * 通知消息發(fā)送到群聊
     * @param webhook 釘釘機(jī)器人地址(配置機(jī)器人的webhook)
     * @param isAtAll 是否通知所有人
     * @param mobileList 通知具體人的手機(jī)號碼列表
     * @param content 消息內(nèi)容
     */
    public static void sendMsgToGroupChat(String webhook,boolean isAtAll,List<String> mobileList,String content){
        try {
            //組裝請求內(nèi)容
            String reqStr = buildReqStr(content, isAtAll, mobileList);
            //推送消息(http請求)
            String result = HttpUtil.post(webhook, reqStr);
            log.info("通知響應(yīng)結(jié)果：{}",result);
        }catch (Exception e){
            log.error("webhook通知失敗",e);
        }
    }
    
    /**
     * 組裝請求報文（Map封裝）
     * @param content 通知內(nèi)容
     * @param isAtAll 是否@所有人
     * @param mobileList 通知具體人的手機(jī)號碼
     * @return
     */
    private static String buildReqStr(String content, boolean isAtAll, List mobileList) {

        //消息內(nèi)容
        Map contentMap = Maps.newHashMap();
        contentMap.put("content", content);

        //通知人
        Map atMap = Maps.newHashMap();
        //1.是否通知所有人
        atMap.put("isAtAll", isAtAll);
        //2.通知具體人的手機(jī)號碼列表
        atMap.put("atMobiles", mobileList);

        Map reqMap = Maps.newHashMap();
        reqMap.put("msgtype", "text");
        reqMap.put("text", contentMap);
        reqMap.put("at", atMap);

        return JSON.toJSONString(reqMap);

    }
    
    /**
     * 獲取通知消息
     * @return
     */
    private static String getContent() {
        //釘釘機(jī)器人消息內(nèi)容
        String content;
        //通過轉(zhuǎn)碼網(wǎng)站http://tool.chinaz.com/Tools/unicode.aspx
        // 選擇中文轉(zhuǎn)Unicode把釘釘表情轉(zhuǎn)換成unicode編碼，也可以直接用表情對應(yīng)的中文設(shè)置
        String milkyTea = "過來請我喝奶茶[奶茶][流鼻血][流鼻血]\u005b\u6d41\u9f3b\u8840\u005d";
        String NEWLINE = "\n";
        StringBuffer sb = new StringBuffer();
        sb.append("小哥哥，你好！")
                .append(NEWLINE)
                .append(milkyTea);
        content = sb.toString();
        return content;
    }

    public static void main(String[] args) throws ApiException {
        //把webhook設(shè)置成對應(yīng)群的即可
        String webhook = "https://oapi.dingtalk.com/robot/send?access_token=xxx";
        String content = getContent();
        ArrayList<String> mobileList = Lists.newArrayList();
		sendMsgToGroupChat(webhook,false,mobileList,content);
    }

        <dependency>
            <groupId>com.aliyun</groupId>
            <artifactId>alibaba-dingtalk-service-sdk</artifactId>
            <version>2.0.0</version>
        </dependency>

 /**
     * 通知SDK消息發(fā)送到群聊
     * @param webhook 釘釘機(jī)器人地址(配置機(jī)器人的webhook)
     *
     */
    public static void sendMsgToGroupChatSDK(String webhook) throws ApiException {
        DingTalkClient client = new DefaultDingTalkClient(webhook);
        OapiRobotSendRequest request = new OapiRobotSendRequest();
        //普通文本消息
        request.setMsgtype("text");
        OapiRobotSendRequest.Text text = new OapiRobotSendRequest.Text();
        text.setContent("你好，測試文本消息");
        request.setText(text);
        OapiRobotSendRequest.At at = new OapiRobotSendRequest.At();
        at.setAtMobiles(Arrays.asList("176xxx"));
        // isAtAll類型如果不為Boolean，請升級至最新SDK
        at.setIsAtAll(true);
        at.setAtUserIds(Arrays.asList("109929","32099"));
        request.setAt(at);

        //md格式消息
        request.setMsgtype("markdown");
        OapiRobotSendRequest.Markdown markdown = new OapiRobotSendRequest.Markdown();
        markdown.setTitle("杭州天氣");
        markdown.setText("#### 杭州天氣 @156xxxx8827\n" +
                "> 9度，西北風(fēng)1級，空氣良89，相對溫度73%\n\n" +
                "> ![screenshot](https://gw.alicdn.com/tfs/TB1ut3xxbsrBKNjSZFpXXcXhFXa-846-786.png)\n"  +
                "> ###### 10點20分發(fā)布 [天氣](http://www.thinkpage.cn/) \n");
        request.setMarkdown(markdown);
      
        //鏈接
        request.setMsgtype("link");
        OapiRobotSendRequest.Link link = new OapiRobotSendRequest.Link();
        link.setMessageUrl("https://blog.csdn.net/qq_35427589");
        link.setPicUrl("");
        link.setTitle("時代的火車向前開");
        link.setText("這個即將發(fā)布的新版本，創(chuàng)始人xx稱它為紅樹林。而在此之前，每當(dāng)面臨重大升級，產(chǎn)品經(jīng)理們都會取一個應(yīng)景的代號，這一次，為什么是紅樹林");
        request.setLink(link);

        OapiRobotSendResponse response = client.execute(request);
        log.info("執(zhí)行結(jié)果回執(zhí){}",JSON.toJSONString(response));
    }