1. 确保下面的条件已经满足：

• 客户端订阅的主题名称与生产者发布到主题的名称相同。
• 客户端与服务器连接成功，并且订阅了正确的主题。
• 消息传递模式正确设置为PUBLISH。

2. 如果上述条件已经满足，请尝试修改你的客户端环境，例如在配置文件中添加以下行：

connectionFactoryAddresses= tcp://127.0.0.1:61616 connectionFactoryUsername=guest connectionFactoryPassword=guest

3. 如果以上方法都无法解决问题，请检查MQTT.fx版本是否支持ActiveMQ Artemis协议。

以下是使用Java编写的ActiveMQ Artemis client示例代码：

package org.apache.activemq.artemis.example;

import javax.jms.Connection; import javax.jms.ConnectionFactory; import javax.jms.MessageProducer; import javax.jms.Session; import javax.jms.TextMessage;

import org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory;

public class ArtemisProducer { public static void main(String[] args) throws Exception { Connection connection = null; try { // Step 1. Create an initial context to perform JNDI operations String brokerURL = "tcp://localhost:61616"; String userName = "username"; String password = "password"; ConnectionFactory cf = new ActiveMQConnectionFactory(brokerURL, userName, password);

        // Step 2. Get a JMS connection from the connection factory
        connection = cf.createConnection();

        // Step 3. Open a session on the connection
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        // Step 4. Create a producer for the queue
        MessageProducer producer = session.createProducer(session.createQueue("exampleQueue"));

        // Step 5. Create a text message
        TextMessage message = session.createTextMessage("Hello, Artemis!");

        // Step 6. Send the message using the producer
        producer.send(message);

        System.out.println("Message sent successfully!");