java开发：发送钉钉消息

钉钉设置：
1、创建群聊

2、群聊设置自定义机器人：

3、获取webhook地址

4、写代码：

public class MessageService {

    public static String url = "https://oapi.dingtalk.com/robot/send?access_token=****";
    
    public static String keyWords = "监控信息:";
    
    public static String sendMessage(String json) {
        try {
            HttpComponentsClientHttpRequestFactory httpRequestFactory = new HttpComponentsClientHttpRequestFactory();
            httpRequestFactory.setConnectionRequestTimeout(500);
            httpRequestFactory.setConnectTimeout(500);
            httpRequestFactory.setReadTimeout(500);
            RestTemplate template = new RestTemplate(httpRequestFactory);
            //ClientHttpRequestFactory clientFactory = new HttpComponentsClientHttpRequestFactory();
            //template.setRequestFactory(clientFactory);
            URI uri = UriComponentsBuilder.fromUriString(url) //
                    .build().encode().toUri();
            HttpHeaders requestHeaders = new HttpHeaders();
            requestHeaders.setContentType(MediaType.APPLICATION_JSON_UTF8);
            requestHeaders.setAccept(Arrays.asList(MediaType.APPLICATION_JSON_UTF8));
            @SuppressWarnings({ "rawtypes", "unchecked" })
            HttpEntity<String> requestEntity = new HttpEntity(json,requestHeaders);
            ResponseEntity<String> responseEntity = template.exchange(uri, HttpMethod.POST, requestEntity,
                    String.class);
            System.out.println(responseEntity.getBody());
            return responseEntity.getBody();
        } catch (Exception e) {
            //do noting
        }
        return null;
    }
    
    public static String sendTextMsg(String text) {
        JSONObject json = new JSONObject();
        json.put("msgtype", "text");
        Map<String,String> map = new HashMap<>();
        map.put("content", keyWords + text);
        json.put("text",map);
        return sendMessage(json.toString());
    }
    
    public static String sendLinkMsg(String title,String text,String picUrl,String messageUrl) {
        JSONObject json = new JSONObject();
        json.put("msgtype", "link");
        Map<String,String> map = new HashMap<>();
        map.put("text", keyWords + text);
        map.put("title", title);
        map.put("picUrl", picUrl);
        map.put("messageUrl", messageUrl);
        json.put("link",map);
        return sendMessage(json.toString());
    }

    public static void main(String[] args) {
        sendTextMsg("测试");
    }