百度开放云物接入IoT--Java客户端

旧城等待， 2022-09-21 13:20 174阅读 0赞

给出一个百度云开放平台的Java客户端示例代码，进行了一点点修改

以上一篇写的文章中的websocket客户端为发布者。订阅者我们用百度的示例Java程序

[百度开放云物接入IoT–MQTT测试][IoT_MQTT]

订阅者的客户端代码如下：

package com.mymqtt.baidu;
    
    import java.security.KeyStore;
    
    import javax.net.ssl.SSLContext;
    import javax.net.ssl.TrustManager;
    import javax.net.ssl.TrustManagerFactory;
    
    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 endpoint = "ssl://gwcheng.mqtt.iot.gz.baidubce.com:1884";   //输入创建endpoint返回的地址
            String username = "gwcheng/mything1";    //输入创建thing返回的username
            String password = "H0aUPreSnca3NslTft+oHjwgZEMjZPOfNBgXnb2F+6o="; //输入创建principal返回的password
            String topic = "helloTopic"; //订阅的消息主题，本例是指订阅helloTopic
    
            TrustManagerFactory tmf = TrustManagerFactory.getInstance("X509");
            tmf.init((KeyStore)null);
            TrustManager[] trustManagers = tmf.getTrustManagers();
    
            SSLContext ctx = SSLContext.getInstance("TLS");
            ctx.init(null, trustManagers, null);
    
            MqttConnectOptions options = new MqttConnectOptions();
            options.setCleanSession(true);
            options.setUserName(username);
            options.setPassword(password.toCharArray());
            options.setSocketFactory(ctx.getSocketFactory());
    
            MqttClient client = new MqttClient(endpoint, topic);
            client.connect(options);
            client.setCallback(new PushCallback());
            // 为了不让程序退出，一直处于接收消息阶段。
            while(true){
    
                client.subscribe(topic,2);;
            }
    
            // client.disconnect();
        }
    }

好了，运行我们的websocket和Java程序

![这里写图片描述][20160621180425915]

# 参考文献 #

> [百度官方文档][Link 1]

[IoT_MQTT]: http://blog.csdn.net/frankcheng5143/article/details/51728994
[20160621180425915]: /images/20220721/51ac868f0c5d4cb49fd9a97edce3f8bc.png
[Link 1]: https://bce.baidu.com/doc/IOT/IoTCLI.html#.7C.34.02.71.16.05.F1.27.A9.1F.24.90.FE.59.5B.5D