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本文介绍在Android上使用mqtt,附上客户端demo和服务器demo。
mqtt资料自行百度
客户端:
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public class MqttService extends Service {
private String host = "tcp://192.168.1.184:1883";
private String userName = "admin";
private String passWord = "password";
private Handler handler;
private MqttClient client;
private String myTopic = "test/topic";
private MqttConnectOptions options;
private ScheduledExecutorService scheduler;
public MqttService</span>() {
super();
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
Log.i("Gmw", "onCreate");
init();
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == 1) {
Log.i("Gmw", "" + (String) msg.obj);
} else if (msg.what == 2) {
Log.i("Gmw", "连接成功");
try {
client.subscribe(myTopic, 1);
} catch (Exception e) {
e.printStackTrace();
}
} else if (msg.what == 3) {
Log.i("Gmw", "连接失败,系统正在重连");
}
}
};
startReconnect();
}
private void startReconnect() {
scheduler = Executors.newSingleThreadScheduledExecutor();
scheduler.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
if (!client.isConnected()) {
connect();
}
}
}, 0 * 1000, 10 * 1000, TimeUnit.MILLISECONDS);
}
private void init() {
try {
//host为主机名,test为clientid即连接MQTT的客户端ID,一般以客户端唯一标识符表示,MemoryPersistence设置clientid的保存形式,默认为以内存保存
client = new MqttClient(host, "lalalalalal",
new MemoryPersistence());
//MQTT的连接设置
options = new MqttConnectOptions();
//设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录,这里设置为true表示每次连接到服务器都以新的身份连接
options.setCleanSession(true);
//设置连接的用户名
options.setUserName(userName);
//设置连接的密码
options.setPassword(passWord.toCharArray());
// 设置超时时间 单位为秒
options.setConnectionTimeout(10);
// 设置会话心跳时间 单位为秒 服务器会每隔1.5*20秒的时间向客户端发送个消息判断客户端是否在线,但这个方法并没有重连的机制
options.setKeepAliveInterval(20);
//设置回调
client.setCallback(new MqttCallback() {
@Override
public void connectionLost(Throwable cause) {
//连接丢失后,一般在这里面进行重连
Log.i("Gmw", "connectionLost");
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
//publish后会执行到这里
Log.i("Gmw", "deliveryComplete");
}
@Override
public void messageArrived(String topicName, MqttMessage message)
throws Exception {
//subscribe后得到的消息会执行到这里面
Log.i("Gmw", "messageArrived");
Message msg = new Message();
msg.what = 1;
msg.obj = topicName + "---" + message.toString();
handler.sendMessage(msg);
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
private void connect() {
new Thread(new Runnable() {
@Override
public void run() {
try {
client.connect(options);
Message msg = new Message();
msg.what = 2;
handler.sendMessage(msg);
} catch (Exception e) {
e.printStackTrace();
Message msg = new Message();
msg.what = 3;
handler.sendMessage(msg);
}
}
}).start();
}
@Override
public void onDestroy() {
super.onDestroy();
Log.i("Gmw", "onDestroy");
try {
scheduler.shutdown();
client.disconnect();
} catch (MqttException e) {
e.printStackTrace();
}
}
}
ActiveMQ,下载地址:http://activemq.apache.org/download.html
下载后cd到/bin/macosx/activemq 目录 输入命令:./activemq start 启动服务器项目
打开浏览器 localhost:8161 能启动正常就说明服务器启动成功了
运行客户端代码连接服务器,然后用服务器给客户端推动信息
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