RabbitMQ(六)：RabbitMQ-消费消息-basicConsume

转载地址： https://www.jianshu.com/p/df231c152754

RabbitMQ-消费消息

        Address[] addresses = new Address[] {new Address(IP_ADDRESS, PORT)};

        /**
         * 1.建立连接工厂
         */
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setUsername(USER_NAME);
        connectionFactory.setPassword(PASSWORD);

        /**
         * 网络故障自动连接恢复
         */
        connectionFactory.setAutomaticRecoveryEnabled(true);

        /**
         * 2.创建连接 和生产者有一点不同
         */
        Connection connection = connectionFactory.newConnection(addresses);

        /**
         * 3.创建信道
         */
        final Channel channel = connection.createChannel();    

        /**
         * 4.设置客户端最多接收示被ack的消息个数
         */
        channel.basicQos(64);
        Consumer consumer  =new DefaultConsumer(channel) {

            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body)

                    throws IOException {

                System.out.println("接收消息 :   "+new String(body));

                try {

                    TimeUnit.SECONDS.sleep(1);

                } catch (InterruptedException e) {

                    e.printStackTrace();

                }

                //消息确认
                channel.basicAck(envelope.getDeliveryTag(), false);
            }
        };

        /**
         * 回调
         */
        channel.basicConsume(QUEUR_NAME, consumer);

        /**
         * 关闭资源
         */
        TimeUnit.SECONDS.sleep(5);

        channel.close();

        connection.close();

basicConsume方法

 String basicConsume(String queue, Consumer callback) throws IOException;

 String basicConsume(String queue, boolean autoAck, Consumer callback) throws IOException;

 String basicConsume(String queue, boolean autoAck, Map<String, Object> arguments, Consumer callback) throws IOException;

 String basicConsume(String queue, boolean autoAck, String consumerTag, Consumer callback) throws IOException;

 String basicConsume(String queue, boolean autoAck, String consumerTag, boolean noLocal, boolean exclusive, Map<String, Object> arguments, Consumer callback) throws IOException;

queue 队列名

autoAck 是否自动确认消息,true自动确认,false 不自动要手动调用,建立设置为false

//消息确认

channel.basicAck(envelope.getDeliveryTag(), false);

consumerTag 消费者标签，用来区分多个消费者

noLocal 设置为true，表示不能将同一个Conenction中生产者发送的消息传递给这个Connection中的消费者

exclusive 是否排他

arguments 消费者的参数

callback 消费者 DefaultConsumer建立使用，重写其中的方法

      @Override
      public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body)；

重写的方法

    @Override
    public void handleConsumeOk(String consumerTag) {
        this._consumerTag = consumerTag;
    }

    @Override
    public void handleCancelOk(String consumerTag) {
        // no work to do
    }
 
    @Override
    public void handleCancel(String consumerTag) throws IOException {
        // no work to do
    }

    @Override
    public void handleShutdownSignal(String consumerTag, ShutdownSignalException sig) {
        // no work to do
    }

    @Override
    public void handleRecoverOk(String consumerTag) {
        // no work to do
    }

handleShutdownSignal方法当Channel与Conenction关闭的时候会调用，

handleCancelOk方法会在其它方法之前调用，返回消费者标签

*handleCancelOk与handleCancel消费者可以显式或者隐式的取水订单的时候调用，也可以通过

channel.basicCancel方法来显式的取消一个消费者订阅

会首先触发handleConsumeOk方法，之后触发handleDelivery方法，最后才触发handleCancelOk方法

channel.basicAck();确认消息

deliveryTag:该消息的index

multiple：是否批量.true:将一次性ack所有小于deliveryTag的消息。

RabbitMQ(六)：RabbitMQ-消费消息-basicConsume

猜你喜欢