Question

我在项目中使用MQTT API来读取数据。（org.eclipse.paho org.eclipse.paho.client.mqttv3）

当我关闭客户端时，mqttcallback仍处于活动状态。我通过调用对象上的unsubscribe(...)，disconnect()和close()来关闭mqtt。

我也尝试将回调设置为null。什么都没有帮助。

mqtt客户端关闭后。这是仍然会在日志中出现的痕迹。

> com.xxx.binge.sources.mqtt.BingeMQTTReader$BingeMQTTCallback.connectionLost(BingeMQTTReader.java:479)
>             at org.eclipse.paho.client.mqttv3.internal.CommsCallback.connectionLost(CommsCallback.java:247)
>             at org.eclipse.paho.client.mqttv3.internal.ClientComms.shutdownConnection(ClientComms.java:356)
>             at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:146)
>             at java.lang.Thread.run(Thread.java:745)
>     Caused by: com.xxx.vds.api.VDSException: MQTT Connection exception
>             at com.xxx.binge.sources.mqtt.BingeMQTTReader.reconnectWithRetry(BingeMQTTReader.java:334)
>             at com.xxx.binge.sources.mqtt.BingeMQTTReader.access$200(BingeMQTTReader.java:46)
>             at com.xxx.binge.sources.mqtt.BingeMQTTReader$BingeMQTTCallback.connectionLost(BingeMQTTReader.java:473)
>             ... 4 more
>     Caused by: Unable to connect to server (32103) - java.net.ConnectException: Connection refused
>             at org.eclipse.paho.client.mqttv3.internal.TCPNetworkModule.start(TCPNetworkModule.java:79)
>             at org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:590)
>             ... 1 more
>     Caused by: java.net.ConnectException: Connection refused
>             at java.net.PlainSocketImpl.socketConnect(Native Method)
>             at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
>             at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
>             at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
>             at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
>             at java.net.Socket.connect(Socket.java:579)
>             at org.eclipse.paho.client.mqttv3.internal.TCPNetworkModule.start(TCPNetworkModule.java:70)
>             ... 2 more

Answer 1

试试这段代码

#!/usr/bin/perl -w
use strict;

use List::Util qw(first);

use Archive::Zip qw(:ERROR_CODES :CONSTANTS);

my $input= 'D:\temp\sample';

my $outDir = 'D:\out\sample.zip';

my $obj = Archive::Zip->new();

$obj->addTree( $input );

# # Write the files to zip.
if ($obj->writeToFileNamed($outDir) == AZ_OK) 
{  
    # write to disk
    print "\n\nArchive created successfully!\n";
} 
else 
{
    print "Error while Zipping !";
}

Answer 2

mqtt发布示例java代码

import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.log4j.Logger;
import com.ibm.micro.client.mqttv3.MqttCallback;
import com.ibm.micro.client.mqttv3.MqttClient;
import com.ibm.micro.client.mqttv3.MqttDeliveryToken;
import com.ibm.micro.client.mqttv3.MqttException;
import com.ibm.micro.client.mqttv3.MqttMessage;
import com.ibm.micro.client.mqttv3.MqttTopic;

public class testMqtt implements MqttCallback {

final static Logger logger = Logger.getLogger(Publish.class);
public SimpleDateFormat loggerdateFormat = new SimpleDateFormat(
        "yyyy MMM dd HH:mm:ss");

public String send(String topicName, String msg) {
    logger.info(loggerdateFormat.format(new Date())
            + " Control on method : send ");
    String topic = topicName;
    String message = msg;
    logger.info(loggerdateFormat.format(new Date()) + " Message " + message);
    if (message.trim().equals("-1")) {
        logger.error(loggerdateFormat.format(new Date())
                + " : message wrong");
        return "fail";
    }
    int qos = 2;
    String url = "tcp://" + Config.Mqtt.BROCKER + ":" + Config.Mqtt.PORT;
    String clientId = "Client-1";

    try {

        Publish sampleClient = new Publish(url, clientId);
        sampleClient.publish(topic, qos, message.getBytes());
    } catch (Exception me) {
        me.printStackTrace();
    }

    return "ok";
}

// Private instance variables
private MqttClient client;
private String brokerUrl;

public testMqtt(String brokerUrl, String clientId) throws MqttException {
    this.brokerUrl = brokerUrl;
    try {
        // Construct the MqttClient instance
        client = new MqttClient(this.brokerUrl, clientId);
        // Set this wrapper as the callback handler
        client.setCallback(this);
    } catch (Exception e) {
        e.printStackTrace();
        log("Unable to set up client: " + e.toString());
        System.exit(1);
    }
}

public testMqtt() {
    // TODO Auto-generated constructor stub
}

public void publish(String topicName, int qos, byte[] payload)
        throws MqttException {

    // Connect to the server
    log("Connecting to " + brokerUrl);
    try {
        // Connect to the server
        client.connect();
    } catch (Exception e) {

        log("Unable to connect: " + e.toString());
        return;
    }
    log("Connected !!!");

    // Get an instance of the topic
    MqttTopic topic = client.getTopic(topicName);

    // Construct the message to publish
    MqttMessage message = new MqttMessage(payload);
    message.setQos(qos);

    // Publish the message
    log("Publishing to topic \"" + topicName + "\" qos " + qos);
    MqttDeliveryToken token = topic.publish(message);

    // Wait until the message has been delivered to the server
    token.waitForCompletion();

    // Disconnect the client
    client.disconnect();
    log("Disconnected");
}

private void log(String message) {
    logger.info(loggerdateFormat.format(new Date()) + ": log - " + message);
}

// Called when the connection to the server has been lost.
public void connectionLost(Throwable cause) {
    log("Connection to " + brokerUrl + " lost!");
    System.exit(1);
}

public void deliveryComplete(MqttDeliveryToken token) {
    log("Message Delivered Successfully!!!");
}

// Called when a message arrives from the server.
public void messageArrived(MqttTopic topic, MqttMessage message)
        throws MqttException {
    logger.info(loggerdateFormat.format(new Date()) + " : Topic:\t\t"
            + topic.getName());
    logger.info(loggerdateFormat.format(new Date()) + " : Message:\t"
            + new String(message.getPayload()));
    logger.info(loggerdateFormat.format(new Date()) + " : QoS:\t\t"
            + message.getQos());
}

}

（Paho）MQTT回调未关闭

2 个答案: