RabbitMQ自定义消费者

我们之前呢都是在代码中编写while循环，进行 consumer.nextDelivery 方法进行获取下一条消息，然后进行消费处理！
其实我们还可以使用自定义的Consumer，它更加的方便，解耦性更加的强，也是在实际工作中最常用的使用方式！
自定义消费端实现只需要继承 DefaultConsumer 类，重写 handleDelivery 方法即可

生产端：

public class Producer {
    public static void main(String[] args) throws Exception {
        
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("192.168.11.76");
        connectionFactory.setPort(5672);
        connectionFactory.setVirtualHost("/");
        
        Connection connection = connectionFactory.newConnection();
        Channel channel = connection.createChannel();
        
        String exchange = "test_consumer_exchange";
        String routingKey = "consumer.save";
        
        String msg = "Hello RabbitMQ Consumer Message";
        
        for(int i =0; i<5; i ++){
            channel.basicPublish(exchange, routingKey, true, null, msg.getBytes());
        }       
    }
}

消费端:

public class Consumer {
    public static void main(String[] args) throws Exception {
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("192.168.11.76");
        connectionFactory.setPort(5672);
        connectionFactory.setVirtualHost("/");
        
        Connection connection = connectionFactory.newConnection();
        Channel channel = connection.createChannel();
                
        String exchangeName = "test_consumer_exchange";
        String routingKey = "consumer.#";
        String queueName = "test_consumer_queue";
        
        channel.exchangeDeclare(exchangeName, "topic", true, false, null);
        channel.queueDeclare(queueName, true, false, false, null);
        channel.queueBind(queueName, exchangeName, routingKey);
        
        channel.basicConsume(queueName, true, new MyConsumer(channel));         
    }
}

MyConsumer:

public class MyConsumer extends DefaultConsumer {

    public MyConsumer(Channel channel) {
        super(channel);
    }

    @Override
    public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
        System.err.println("-----------consume message----------");
        System.err.println("consumerTag: " + consumerTag);
        System.err.println("envelope: " + envelope);
        System.err.println("properties: " + properties);
        System.err.println("body: " + new String(body));
    }

}

运行说明：
先启动消费端，访问管控台：http://1192.168.11.76:15672，检查Exchange和Queue是否设置OK，然后启动生产端。此时就能在控制台看到打印信息了。