MQTT消息監聽ｄｅｍｏ

public class CrossClient {

    private static final String USERNAME = "admin";//用戶名
    private static final String PASSWORD = "password";//密碼

    public void crossSensationLink(){

        //用於測試的topic
        final String topic = "bvip_notify";
        //接入服務器域名
        String targetServer = ConfigCacheUtil.getConf("crossClient").getValue();
        String broker = "tcp://" + targetServer;
        String clientId = UUID.randomUUID().toString();
//        String clientId = "123456789123451";
        MemoryPersistence persistence = new MemoryPersistence();
        try {
            final MqttClient mqttClient = new MqttClient(broker,clientId,persistence);
            MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();
            final CrossCameraService crossCameraService = (CrossCameraService) SpringUtil
                    .getBean("crossCameraServiceImpl");
            final CrossBorderService crossBorderService = (CrossBorderService) SpringUtil
             .getBean("CrossBorderServiceImpl");
            //MQTT 3.1.1
            mqttConnectOptions.setMqttVersion(4);
            //設置是否自動重連
            mqttConnectOptions.setAutomaticReconnect(true);
            mqttConnectOptions.setUserName(USERNAME);
            mqttConnectOptions.setPassword(PASSWORD.toCharArray());
            mqttConnectOptions.setKeepAliveInterval(80);
            mqttClient.connect(mqttConnectOptions);

            mqttClient.setCallback(new MqttCallback() {
                @Override
                public void connectionLost(Throwable throwable) {
                    System.out.println("連接失敗,原因:" + throwable);
                }

                @Override
                public void messageArrived(String s, MqttMessage mqttMessage) throws Exception {
                    System.out.println(System.currentTimeMillis() + "接收到消息，來自Topic [" + s+ "] ，內容是:["+ new String(mqttMessage.getPayload(),"UTF-8") + "]，num");

                        //過濾是不是json數據，是不是報警事件
                        String corssBorderJson = new String(mqttMessage.getPayload(), "UTF-8");
                    HttpServletRequest request = getRequest();
                    JSONObject  param = null;
                    try {
                        param = JSONObject. fromObject(corssBorderJson);
                        try {
                            String taskType = param.get("TaskType").toString();
                            if (taskType.equals("AlarmEvent")){
                                crossCameraService.saveCrossCamers(param);
//                                String data = crossBorderService.querySound(param);
//                                crossBorderService.login(data, request);
                            }
                        }catch (Exception e){
                            System.out.println("不是報警事件數據");
                        }
                    }catch (Exception e){
                        System.out.println("不是json格式數據");
                    }
                }

                @Override
                public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {
                    //如果是qos 0消息 token.resp是沒有回覆的
                    System.out.println("消息發送成功!"
                            + ((iMqttDeliveryToken == null || iMqttDeliveryToken.getResponse() == null)? "null" : iMqttDeliveryToken.getResponse().getKey()));
                }
            });
            mqttClient.subscribe(topic);
            System.out.println(System.currentTimeMillis() + "連接成功:---");
        }catch (Exception e){
            e.printStackTrace();
            System.out.println("連接失敗");
        }
    }



}