如何消费一条消息？ [英] How to consume one message?

问题描述

使用rabbitmq中的示例，消费者可以从队列中获取所有消息一度。如何使用一条消息并退出？

With example in rabbitmq, consumer get all messages from queue at one time. How to consume one message and exit?

QueueingConsumer consumer = new QueueingConsumer(channel);
channel.basicConsume(QUEUE_NAME, true, consumer);

while (true) {
  QueueingConsumer.Delivery delivery = consumer.nextDelivery();
  String message = new String(delivery.getBody());
  System.out.println(" [x] Received '" + message + "'");
}

推荐答案

你必须声明basicQos设置从ACK到NACK状态一次获取一条消息并禁用自动ACK以明确给出确认。

You have to declare basicQos setting to get one message at a time from ACK to NACK status and disable auto ACK to give acknowledgement explicitly.

ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("localhost");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();
    channel.basicQos(1);
    channel.queueDeclare(QUEUE_NAME, true, false, false, null);
    System.out.println("[*] waiting for messages. To exit press CTRL+C");

    QueueingConsumer consumer = new QueueingConsumer(channel);
    channel.basicConsume(QUEUE_NAME, consumer);
    while(true) {
        QueueingConsumer.Delivery delivery = consumer.nextDelivery();
        int n = channel.queueDeclarePassive(QUEUE_NAME).getMessageCount();
        System.out.println(n);
        if(delivery != null) {
            byte[] bs = delivery.getBody();
            System.out.println(new String(bs));
            //String message= new String(delivery.getBody());
            channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
            //System.out.println("[x] Received '"+message);
        }
    }

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