【MQTT】客户端

Mqtt客户端

首先我们得需要mqtt3.jar包
mqtt3下载连接

package com.clientmqtt; 

import android.content.Context;
import android.telephony.TelephonyManager;

import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttTopic;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;

import java.util.concurrent.ScheduledExecutorService;

import static android.content.Context.TELEPHONY_SERVICE;


public class ClientMQTT {
    //注意这里 改成搭建服务器地址
    public static final String HOST = "tcp://192.168.10.67:61613";
    public static final String TOPIC = "topic11";
    private String clientid = "client";
    private MqttClient client;
    private MqttConnectOptions options;
    private String userName = "admin";
    private String passWord = "password";
    private MqttCallback mMqttCallback;
    private ScheduledExecutorService scheduler;



    public void start() {
        try {
            // host为主机名，clientid即连接MQTT的客户端ID，一般以唯一标识符表示，MemoryPersistence设置clientid的保存形式，默认为以内存保存
            client = new MqttClient(HOST, clientid, 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(mMqttCallback);
            client.setTimeToWait(500000);
            MqttTopic topic = client.getTopic(TOPIC);
            //setWill方法，如果项目中需要知道客户端是否掉线可以调用该方法。设置最终端口的通知消息
            options.setWill(topic, "close".getBytes(), 2, true);

            client.connect(options);
            //订阅消息
            int[] Qos = {1};
            String[] topic1 = {TOPIC};
            client.subscribe(topic1, Qos);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public ClientMQTT(MqttCallback mqttCallback ,Context context) {
        TelephonyManager TelephonyMgr = (TelephonyManager)context.getSystemService(TELEPHONY_SERVICE);
        this.clientid=TelephonyMgr.getDeviceId();
        this.mMqttCallback=mqttCallback;
        start();
    }

    public void connect() {
        try {
            client.connect(options);
            //订阅消息
            int[] Qos = {1};
            String[] topic1 = {TOPIC};
            client.subscribe(topic1, Qos);
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }

    public void disconnect() {
        try {
            client.disconnect();
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }
}

package com.clientmqtt;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";
    private ClientMQTT mClientMQTT;
    private TextView mButton;
    public  Handler myHandler = new Handler() {
        public void handleMessage(Message msg) {
            mButton.setText(msg.obj+"");
            }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mButton = (TextView) findViewById(R.id.jieshou);
        findViewById(R.id.create).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mClientMQTT = new ClientMQTT(new MqttCallback() {
                    @Override
                    public void connectionLost(Throwable cause) {
                        System.out.println("连接断开，可以做重连");
                       // mClientMQTT.connect();
                    }

                    @Override
                    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()));
                        if("close".equals(new String(message.getPayload()))){
                            System.out.println("接收消息内容 : " + new String(message.getPayload()));
                        }else {
                            Message message1 =new Message();
                            message1.obj=new String(message.getPayload());
                            myHandler.sendMessage(message1);
                            System.out.println("接收消息内容 mButton: " + new String(message.getPayload()));
                        }
                    }

                    @Override
                    public void deliveryComplete(IMqttDeliveryToken token) {
                        System.out.println("deliveryComplete---------" + token.isComplete());
                    }
                },MainActivity.this);
            }
        });
        findViewById(R.id.connect).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mClientMQTT.connect();

            }
        });

        findViewById(R.id.disconnect).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mClientMQTT.disconnect();
            }
        });

    }

}

服务端发来的消息

Paste_Image.png