Java后台推送告警信息到钉钉

<!-- OKHttp3依赖 -->
<dependency>
   <groupId>com.squareup.okhttp3</groupId>
   <artifactId>okhttp</artifactId>
   <version>3.12.6</version>
</dependency>
<dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
   <version>1.18.6</version>
</dependency>
<dependency>
  <groupId>org.apache.commons</groupId>
  <artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
  <groupId>commons-codec</groupId>
  <artifactId>commons-codec</artifactId>
</dependency>
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>fastjson</artifactId>
</dependency>

@Slf4j
public class DingTalkUtil {
    private static OkHttpClient mClient;
    private static String url;
    //初始化客户端
    static {
        OkHttpClient.Builder builder = new OkHttpClient.Builder();
        builder.connectTimeout(10L, TimeUnit.SECONDS);
        builder.readTimeout(10L, TimeUnit.SECONDS);
        Dispatcher dispatcher = new Dispatcher();
        dispatcher.setMaxRequestsPerHost(200);
        dispatcher.setMaxRequests(200);
        builder.dispatcher(dispatcher);
        mClient = builder.build();
        try {
            url = getSign();
        } catch (Exception e) {
            log.error("k8s节点出现问题，调用钉钉API进行报警，获取签名失败！");
            e.printStackTrace();
        }
    }
    /**
     * 通用 POST 请求方法  依赖 OKhttp3
     * @param message 所要发送的消息
     * @return 发送状态回执
     */
    public static String postWithJson(String message) {
        JSONObject jsonObject = new JSONObject();
        //固定参数
        jsonObject.put("msgtype", "text");
        JSONObject content = new JSONObject();
        //此处message是你想要发送到钉钉的信息
        content.put("content", message);
        jsonObject.put("text", content);
        RequestBody body = RequestBody.create(
                MediaType.parse("application/json; charset=utf-8"), jsonObject.toJSONString());
        Request request = new Request.Builder().url(url).post(body).build();
        try {
            Response response = mClient.newCall(request).execute();
            if (response.body() != null) {
                return response.body().string();
            }
        } catch (IOException e) {
            log.error("k8s节点出现问题，调用钉钉API进行报警，消息发送失败！");
            e.printStackTrace();
        }
        return null;
    }
    /**
     * 获取签名
     * @return 返回签名
     */
    private static String getSign() throws Exception {
        String baseUrl = "https://oapi.dingtalk.com/robot/send?access_token=";
        String token = "a28abafca1eda791b2b09bf8a7";
        String secret = "SEC09fedac8a866be756225b9b1b";
        long timestamp = System.currentTimeMillis();
        String stringToSign = timestamp + "\n" + secret;
        // MAC加密算法
        Mac mac = Mac.getInstance("HmacSHA256");
        mac.init(new SecretKeySpec(secret.getBytes(StandardCharsets.UTF_8), "HmacSHA256"));
        byte[] signData = mac.doFinal(stringToSign.getBytes(StandardCharsets.UTF_8));
        return baseUrl + token + "&timestamp=" + timestamp + "&sign=" +
                URLEncoder.encode(new String(Base64.encodeBase64(signData)), "UTF-8");
    }
}

public class Test {
    public static void main(String[] args) {
        String message = "this is a test";
        String res = DingTalkUtil.postWithJson(message);
        System.out.println(res);
    }
}