Question

public class MessageReceiver {
    // URL of the JMS server
    private static String url = "tcp://atuleusbduv012.aemud.com:61616";
    // default broker URL is : tcp://localhost:61616"
    // Name of the queue we will receive messages from
    private static String subject = "activemq.test.incoming.master"; 
    // Queue Name.You can create any/many queue names as per your requirement.
    public static void main(String[] args) throws JMSException, InterruptedException {
        // Getting JMS connection from the server
        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("agile","123456789",url);
        //ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);
        Connection connection = connectionFactory.createConnection();
        connection.start();
        // Creating session for sending messages
        Session session = connection.createSession(false,Session.AUTO_ACKNOWLEDGE);
        System.out.println("session :: "+session.toString());
        // Getting the queue 'amd.tmpesb.sapphire.incoming.master'
        Destination destination = session.createQueue(subject);
        System.out.println("destination :: "+destination.toString());       
        // MessageConsumer is used for receiving (consuming) messages
        MessageConsumer consumer = session.createConsumer(destination);
        System.out.println("consumer :: "+consumer.toString()); 
        // Here we receive the message.
        Message message = consumer.receive();
        System.out.println("message :: "+message.toString());
        // We will be using TestMessage in our example. MessageProducer sent us a TextMessage
        // so we must cast to it to get access to its .getText() method.
        if (message instanceof TextMessage) {
            TextMessage textMessage = (TextMessage) message;
            System.out.println("Received message '" + textMessage.getText() + "'");
        }
        connection.close();
    }
}

上面的代码不是从队列中读取消息，当我调试java类时，我发现“执行在consumer.receive();方法停止，即它不断尝试读取消息但不能读取。请告诉我，上面MessageReceiver课程

中缺少的内容

还有关于向上面的队列发送/写入消息的更多细节。我们使用下面的类将消息发送到队列activemq.test.incoming.master并正在成功发送消息

public class MessageSender {    
    //URL of the JMS server. DEFAULT_BROKER_URL will just mean that JMS server is on localhost
    private static String url = "tcp://atuleusbduv012.aemud.com:61616";
    //private static String url = "tcp://localhost:61616";  
    // default broker URL is : tcp://localhost:61616"
    private static String subject = "activemq.test.incoming.master"; 
    // Queue Name.You can create any/many queue names as per your requirement.      
    public static void main(String[] args) throws JMSException {        
        // Getting JMS connection from the server and starting it
        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("agile","123456789",url);
        //ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);
        Connection connection = connectionFactory.createConnection();
        connection.start();     
        //Creating a non transactional session to send/receive JMS message.
        Session session = connection.createSession(false,Session.AUTO_ACKNOWLEDGE);         
        //Destination represents here our queue 'JCG_QUEUE' on the JMS server. 
        //The queue will be created automatically on the server.
        Destination destination = session.createQueue(subject);         
        // MessageProducer is used for sending messages to the queue.
        MessageProducer producer = session.createProducer(destination);     
        // We will send a small text message saying 'Hello World!!!' 
        TextMessage message = session.createTextMessage("Hello !!! Welcome to the world of ActiveMQ.");     
        // Here we are sending our message!
        producer.send(message);     
        System.out.println("JCG printing@@ '" + message.getText() + "'");
        connection.close();
    }
}

我请求您告诉我上述MessageReceiver课程中缺少的内容，因为它没有从队列activemq.test.incoming.master中读取消息。

Answer 1

我使用线程概念来读取和写入队列的消息。参考链接http://activemq.apache.org/hello-world.html receiver可以等待一段时间来接收消息consumer.receive(3000)，并且在尝试接收等待一段时间后使用Thread.sleep(300)生成更多消息，我们将能够读取和写入消息到远程机器中的队列。全部谢谢

MessageConsumer接收方法不是从远程机器队列中读取消息

1 个答案: