【MQTT】服务端

创建连接

MainActivity

首先我们得需要mqtt3.jar包
mqtt3下载连接

package com.servermqtt;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

import org.eclipse.paho.client.mqttv3.MqttException;

    public class MainActivity extends AppCompatActivity {
        private ServerMQTT mServerMQTT;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            final EditText msg= (EditText) findViewById(R.id.msg);

            findViewById(R.id.send).setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {

                 mServerMQTT.sendMessage(msg.getText().toString().trim()+"");
                }
            });
            findViewById(R.id.create). setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    try {
                        mServerMQTT=new ServerMQTT();
                    } catch (MqttException e) {
                        e.printStackTrace();
                    }
                }
            });
        }
    }

ServerMQTT

 package com.servermqtt;

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
 */
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://192.168.10.67:61613";
    //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 = "client1";

    private MqttClient client;
    private MqttTopic topic11;
    private String userName = "admin";
    private String passWord = "password";

    private MqttMessage message;
    private ServerMQTT mServer;

    /**
     * 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());
    }
    public void  sendMessage(String msg){
        try {
            message = new MqttMessage();
            message.setQos(1);
            message.setRetained(true);
            message.setPayload(msg.getBytes());
            publish(topic11 , message);
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }
}

PushCallback

package com.servermqtt; /**
 *
 * Description:
 * @author admin
 * 2017年2月10日下午18:04:07
 */

import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttMessage;

/**
 * 发布消息的回调类
 *
 * 必须实现MqttCallback的接口并实现对应的相关接口方法CallBack 类将实现 MqttCallBack。
 * 每个客户机标识都需要一个回调实例。在此示例中，构造函数传递客户机标识以另存为实例数据。
 * 在回调中，将它用来标识已经启动了该回调的哪个实例。
 * 必须在回调类中实现三个方法：
 *
 *  public void messageArrived(MqttTopic topic, MqttMessage message)接收已经预订的发布。
 *
 *  public void connectionLost(Throwable cause)在断开连接时调用。
 *
 *  public void deliveryComplete(MqttDeliveryToken token))
 *  接收到已经发布的 QoS 1 或 QoS 2 消息的传递令牌时调用。
 *  由 MqttClient.connect 激活此回调。
 *
 */
public class PushCallback implements MqttCallback {

    public void connectionLost(Throwable cause) {
        // 连接丢失后，一般在这里面进行重连
        System.out.println("连接断开，可以做重连");
    }

    public void deliveryComplete(IMqttDeliveryToken token) {
        System.out.println("deliveryComplete---------" + token.isComplete());
    }

    public void messageArrived(String topic, MqttMessage message) throws Exception {
        // subscribe后得到的消息会执行到这里面
        System.out.println("接收消息主题 : " + topic);
        System.out.println("接收消息Qos : " + message.getQos());
        System.out.println("接收消息内容 : " + new String(message.getPayload()));
    }
}

创建连接成功我们会在后台看见

Paste_Image.png

接着我们来发消息 不过这个时候我们还没有客户端的连接 我们先连接一下客户端

Paste_Image.png

客户端成功接收消息 客户端

Paste_Image.png