以前有一段时间普通群聊不支持创建自定义机器人，最近好像又可以了，遂发一篇文章讲解一下流程

创建机器人

首先在需要添加机器人的群里添加机器人，选择自定义机器人，创建成功之后记录webhook地址，安全策略可自行选择，此处介绍的是加签策略下的实现

代码

import cn.hutool.http.HttpRequest;
import com.alibaba.fastjson.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.net.URLEncoder;import org.apache.commons.codec.binary.Base64;import java.util.*;/*** 推送钉钉告警消息*/
public class AutoSendDingtalkMessage {private static final Logger logger = LoggerFactory.getLogger(AutoSendDingtalkMessage.class);/*** 发送超时时间10s*/private static final int TIME_OUT = 10000;private static String webhook = "填入自己机器人的地址";static {Long timestamp = System.currentTimeMillis();String secret = "填入相应内容";String stringToSign = timestamp + "\n" + secret;Mac mac = null;String sign = null;try {mac = Mac.getInstance("HmacSHA256");mac.init(new SecretKeySpec(secret.getBytes("UTF-8"), "HmacSHA256"));byte[] signData = mac.doFinal(stringToSign.getBytes("UTF-8"));sign = URLEncoder.encode(new String(Base64.encodeBase64(signData)), "UTF-8");} catch (Exception e) {logger.error("消息推送到钉钉的签名密钥处理失败，请检查告警有无正常发送", e);}webhook += "&timestamp=" + timestamp + "&sign=" + sign;}public static String sendMsg(String content, List<String> mobileList) {try {//是否通知所有人boolean isAtAll = false;//组装请求内容String dataString = buildReqStr(content, isAtAll, mobileList);//推送消息（http请求）String result = sendMsg(webhook, dataString);return result;} catch (Exception e) {logger.error("发送群通知异常 异常原因：" + e);return null;}}/*** 组装请求报文*/private static String buildReqStr(String content, boolean isAtAll, List<String> mobileList) {// Markdown 格式的消息内容JSONObject markdownContent = new JSONObject();markdownContent.put("title", "毕设异常通知");// 在消息内容中添加换行符content = "## 警告：\n" +"### 毕设运行出现异常，内容如下：\n\n```\n" + content + "\n```";markdownContent.put("text", content);// 通知人JSONObject atObject = new JSONObject();atObject.put("isAtAll", isAtAll);if (mobileList != null && !mobileList.isEmpty()) {atObject.put("atMobiles", mobileList);}// 构建请求的 JSONJSONObject reqObject = new JSONObject();reqObject.put("msgtype", "markdown");reqObject.put("markdown", markdownContent);reqObject.put("at", atObject);return reqObject.toJSONString();}private static String sendMsg(String url, String dataString) {String body = null;try {body = HttpRequest.post(url).body(dataString).timeout(TIME_OUT).execute().body();} catch (Exception e) {logger.error("发送失败", e);}return body;}
}