Question

我正在使用以下java代码来解包数据。但我不知道我怎么能为Node.js写同样的东西？ Java代码如下所示：

public void receiveEvent(String forTopic, MqttMessage event)
        throws MqttException {
    Object obj = null;
    java.io.ByteArrayInputStream bstream = new   java.io.ByteArrayInputStream(
            event.getPayload());
    try {
        java.io.ObjectInputStream st = new java.io.ObjectInputStream(
                bstream);
        obj = st.readObject();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    DataWrapper dt = (DataWrapper) obj;
 s.notifyReceived(forTopic, dt.getObject(), dt.getDevice());

数据包装器的代码如下所示：

public class DataWrapper implements Serializable {
private static final long serialVersionUID = 1L;
Device device;
Object object;
public void setDevice(Device deviceInfo) {
    this.device = deviceInfo;
}
public void setObject(Object object) {
    this.object = object;
}
public Device getDevice() {
    return device;
}
public Object getObject() {
    return object;
}

}

Answer 1

您可能想要查看MQTT.js.它可以在NPM上找到：https://www.npmjs.com/package/mqtt

举一个完整的例子，我们需要更多地了解您的设置以及您尝试做的事情......但这里是从MQTT复制的示例，js < / p>

var mqtt    = require('mqtt');
var client  = mqtt.connect('mqtt://test.mosquitto.org');

client.on('connect', function () {
  client.subscribe('presence');
  client.publish('presence', 'Hello mqtt');
});

client.on('message', function (topic, message) {
  // message is Buffer 
  console.log(message.toString());
  client.end();
});

它可能非常接近你想要的开始。

java到node.js代码转换

1 个答案: