在springboot启动时给钉钉群发通知

1.因为springboot启动后会加载所用的配置文件，所以我们可以在main方法下写DingTalk的bean来注入DingTalk配置。

@ServletComponentScan
public class Application {

    //DingTalk Bean变量
    private static String DING_TALK_UTIL_BEAN = "dingtalkUtil";
    public static void main(String[] args) {
//    new SpringApplicationBuilder(Application.class).initializers(new AqumonApplicationContextInitializer()).run(args);

        ConfigurableApplicationContext applicationContext = SpringApplication.run(Application.class, args);
        ConfigurableListableBeanFactory beanFactory = applicationContext.getBeanFactory();
        //获取DingTalk Bean
        DingtalkUtil dingTalk = (DingtalkUtil) beanFactory.getBean(DING_TALK_UTIL_BEAN);
        //发送DingTalk通知
        dingTalk.sendTextNotificationToAccountInfo("INFO:Account启动完成");
    }
}

2.DingTalk相关工具类及其方法：

@Data
public class DingtalkUtil {
    Logger logger = LogManager.getLogger(DingtalkUtil.class);

    private URI WEBHOOK_URL_ACCOUNT;

    private URI WEBHOOK_URL_ACCOUNT_INFO;

    public DingtalkUtil(DingtalkConfig dingtalkConfig) {
        try {
            WEBHOOK_URL_ACCOUNT = new URI(dingtalkConfig.getAccountUrl());
            WEBHOOK_URL_ACCOUNT_INFO = new URI(dingtalkConfig.getAccountInfoUrl());

        } catch (URISyntaxException e) {
            logger.fatal("Failed to parse URI of reminder webhook, due to: " + e.getMessage());
        }
    }

    /**
     * 发送文本提醒至Account警告群
     *
     * @param msg 信息
     */
    public void sendTextNotificationToAccount(String msg) {
        sendTextNotification(msg, WEBHOOK_URL_ACCOUNT);
    }

    /**
     * 发送文本提醒至Account通知群
     *
     */
    public void sendTextNotificationToAccountInfo(String msg) {
        sendTextNotification(msg, WEBHOOK_URL_ACCOUNT_INFO);
    }

    /**
     * 发送文本提醒至任意机器人
     *
     * @param msg        信息
     * @param webhookUri 机器人的webhook地址，新的地址可在上面添加为常量
     */
    public void sendTextNotification(String msg, URI webhookUri) {
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(0, new StringHttpMessageConverter(Charset.forName("UTF-8")));
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        HttpEntity<String> entity = new HttpEntity<String>(buildJsonTextMessage(msg, false), headers);
        HttpEntity<String> response = restTemplate.postForEntity(webhookUri, entity, String.class);
        logger.info("Response:
" + response.getBody());
    }

    /**
     * 创建文本提醒Body
     *
     * @param msg
     * @param isAtAll
     * @return
     */
    public String buildJsonTextMessage(String msg, boolean isAtAll) {
        StringBuilder sb = new StringBuilder();
        String atAll = isAtAll ? "true" : "false";
        sb.append("{ "msgtype": "text", "text": { "content": "" + msg + ""}, "isAtAll": " + atAll + "}");
        return sb.toString();
    }