小编R.A*_*sha的帖子

我可以使用此 Java 代码订阅 mosquitto 代理，无需用户名和密码。现在，我想订阅一个需要一些虚拟用户名和密码的 emqttd 代理。我怎样才能做到这一点？。谢谢。

http://tgrall.github.io/blog/2017/01/02/getting-started-with-mqtt/#disqus_thread

https://github.com/emqtt/emqttd

package com.mapr.demo.mqtt.simple;

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

public class Subscriber {

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

    System.out.println("== START SUBSCRIBER ==");

    MqttClient client=new MqttClient("tcp://localhost:1883", MqttClient.generateClientId());
    client.setCallback( new SimpleMqttCallBack() );
    client.connect();

    client.subscribe("iot_data");

  }

}