Aplikasi gabungan PHP dan MQTT dalam e-dagang

require("phpMQTT.php");

// 定义MQTT服务器的连接信息
$host = "mqtt.example.com";
$port = 1883;
$client_id = "php_order_publisher";
$topic = "order_topic";

// 创建一个MQTT客户端
$mqtt = new phpMQTT($host, $port, $client_id);

// 连接MQTT服务器
if(!$mqtt->connect()){
    exit("MQTT服务器连接失败");
}

// 订单信息
$order_id = "123456";
$product_name = "iPhone 12";
$quantity = 2;

// 构造订单消息
$message = json_encode(array(
    "order_id" => $order_id,
    "product_name" => $product_name,
    "quantity" => $quantity
));

// 发布订单消息
$mqtt->publish($topic, $message, 0);

// 断开与MQTT服务器的连接
$mqtt->close();

import org.eclipse.paho.client.mqttv3.*;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;

public class OrderSubscriber {

    public static void main(String[] args) {
        String broker = "tcp://mqtt.example.com:1883";
        String clientId = "java_order_subscriber";
        String topic = "order_topic";
        int qos = 0;

        try {
            // 创建一个MQTT客户端
            MqttClient client = new MqttClient(broker, clientId);
            
            // 设置回调函数处理接收到的消息
            client.setCallback(new MqttCallback() {
                @Override
                public void connectionLost(Throwable throwable) {
                    // 连接丢失时的处理
                }

                @Override
                public void messageArrived(String s, MqttMessage mqttMessage) throws Exception {
                    // 收到消息时的处理
                    String message = new String(mqttMessage.getPayload());
                    System.out.println("Received message: " + message);
                }

                @Override
                public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {
                    // 消息传递完成时的处理
                }
            });

            // 连接MQTT服务器
            client.connect();

            // 订阅主题
            client.subscribe(topic, qos);
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }
}