我下载的是windows版

安装

将下载的压缩包解压，我解压到了D盘

命令行窗口，cd到程序目录

控制台模式启动:

.\bin\emqttd console

报错如下

无法启动此程序，因为计算机中丢失 MSVCR120.dll。尝试重新安装该程序以解决次问题。

找一个MSVCR120.dll文件，可以去网上下载，也可以在自己电脑上找

HBuilder下有
mqttfx下也有
XMind下也有
IDEA下也有

我拷贝一个mqttfx下的到Windows\System32下

然后重新执行

.\bin\emqttd console

启动成功

http://localhost:18083/

用户名为admin密码为public

登录上去就可以看服务器的运行状态了

测试

依赖

    <dependency>

        <groupId>org.eclipse.paho</groupId>

        <artifactId>org.eclipse.paho.client.mqttv3</artifactId>

        <version>1.0.2</version>

    </dependency>

Server

package com.mymqtt.myemqtt;

import java.util.Scanner;

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

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

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

public class Server {

    public static void main(String[] args) throws Exception {

        String host = "tcp://127.0.0.1:1883";

        String topic = "hello";

        String clientId = "server";// clientId不能重复

        MqttConnectOptions options = new MqttConnectOptions();

        options.setCleanSession(true);

        MqttClient client = new MqttClient(host, clientId);

        client.connect(options);

        MqttMessage message = new MqttMessage();

        @SuppressWarnings("resource")

        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入要发送的内容：");

        while (true) {

            String line = scanner.nextLine();

            message.setPayload(line.getBytes());

            client.publish(topic, message);

        }

    }

}

Client

package com.mymqtt.myemqtt;

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

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

public class Client {

    public static void main(String[] args) throws Exception {

        String host = "tcp://127.0.0.1:1883";

        String topic = "hello";

        String clientId = "12345";// clientId不能重复

        // 1.设置mqtt连接属性

        MqttConnectOptions options = new MqttConnectOptions();

        options.setCleanSession(true);

        // 2.实例化mqtt客户端

        MqttClient client = new MqttClient(host, clientId);

        // 3.连接

        client.connect(options);

        client.setCallback(new PushCallback());

        while (true) {

            client.subscribe(topic, 2);

        }

        // client.disconnect();

    }

}

PushCallback

package com.mymqtt.myemqtt;

import java.util.Date;

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

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

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

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

public class PushCallback implements MqttCallback {

    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    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");

        logger.info("掉线时间:{}", new Date());

    }

    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(message);

        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()));

    }

}

结果

控制台显示

两个连接

参考文献

http://emqtt.com/

百度开放云物接入IoT–Java客户端

--------------------- 本文来自 GW_Cheng 的CSDN 博客，全文地址请点击：https://blog.csdn.net/frankcheng5143/article/details/52045501?utm_source=copy

巴特西

转：EMQTT测试--安装与测试 (windows)

安装

测试

依赖