EMQTT测试--安装与测试

官网

我下载的是windows版

安装

参考
http://emqtt.com/docs/install.html

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

登录

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/

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