MQTT相关java代码实现 源码下载

/** * Created by Administrator on 17-2-10. */ import org.eclipse.paho.client.mqttv3.MqttClient; import org.eclipse.paho.client.mqttv3.MqttConnectOptions; import org.eclipse.paho.client.mqttv3.MqttDeliveryToken; import org.eclipse.paho.client.mqttv3.MqttException; import org.eclipse.paho.client.mqttv3.MqttMessage; import org.eclipse.paho.client.mqttv3.MqttPersistenceException; import org.eclipse.paho.client.mqttv3.MqttTopic; import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence; /** * * Title:Server * Description: 服务器向多个客户端推送主题，即不同客户端可向服务器订阅相同主题 * @author admin * 2017年2月10日下午17:41:10 */ public class ServerMQTT { //tcp://MQTT安装的服务器地址:MQTT定义的端口号 public static final String HOST = "tcp://182.254.234.203:1883"; //定义一个主题 public static final String TOPIC = "topic11"; //定义MQTT的ID，可以在MQTT服务配置中指定 private static final String clientid = "server11"; private MqttClient client; private MqttTopic topic11; private String userName = "mosquitto"; private String passWord = ""; private MqttMessage message; /** * 构造函数 * @throws MqttException */ public ServerMQTT() throws MqttException { // MemoryPersistence设置clientid的保存形式，默认为以内存保存 client = new MqttClient(HOST, clientid, new MemoryPersistence()); connect(); } /** * 用来连接服务器 */ private void connect() { MqttConnectOptions options = new MqttConnectOptions(); options.setCleanSession(false); options.setUserName(userName); options.setPassword(passWord.toCharArray()); // 设置超时时间 options.setConnectionTimeout(10); // 设置会话心跳时间 options.setKeepAliveInterval(20); try { client.setCallback(new PushCallback()); client.connect(options); topic11 = client.getTopic(TOPIC); } catch (Exception e) { e.printStackTrace(); } } /** * * @param topic * @param message * @throws MqttPersistenceException * @throws MqttException */ public void publish(MqttTopic topic , MqttMessage message) throws MqttPersistenceException, MqttException { MqttDeliveryToken token = topic.publish(message); token.waitForCompletion(); System.out.println("message is published completely! " + token.isComplete()); } /** * 启动入口 * @param args * @throws MqttException */ public static void main(String[] args) throws MqttException { ServerMQTT server = new ServerMQTT(); server.message = new MqttMessage(); server.message.setQos(1); server.message.setRetained(true); server.message.setPayload("hello,topic11".getBytes()); server.publish(server.topic11 , server.message); System.out.println(server.message.isRetained() + "------ratained状态"); } }