RabbitMQ入门教程(六)：路由选择Routing

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简介

本节主要演示使用直连接类型，将多个路由键绑定到同一个队列上。也可以将同一个键绑定到多个队列上(多重绑定multiple bindings)，此时满足键的队列都能收到消息，不满足的直接被丢弃。

生产者

public class Producer {
    @Test
    public void testBasicPublish() throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("127.0.0.1");
        factory.setPort(AMQP.PROTOCOL.PORT);
        factory.setUsername("mengday");
        factory.setPassword("mengday");

        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        // Routing 的路由规则使用直连接
        String EXCHANGE_NAME = "exchange.direct.routing";
        String[] routingKeys = {"debug", "info", "warning", "error"};
        for (int i = 0; i < 20; i++){
            int random = (int)(Math.random() * 4);
            String routingKey = routingKeys[random];
            String message = "Hello RabbitMQ - " + routingKey + " - " + i;

            channel.basicPublish(EXCHANGE_NAME, routingKey, null, message.getBytes("UTF-8"));
        }

        // 关闭资源
        channel.close();
        connection.close();
    }
}

消费者1

public class Consumer1 {
    @Test
    public void testBasicConsumer1() throws Exception{
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("127.0.0.1");
        factory.setPort(AMQP.PROTOCOL.PORT);
        factory.setUsername("mengday");
        factory.setPassword("mengday");

        Connection connection = factory.newConnection();
        final Channel channel = connection.createChannel();

        String EXCHANGE_NAME = "exchange.direct.routing";
        // 生成一个随机的名称，queueDeclare()方法没有任何参数，当最后一个消费者断开时就会删除掉该队列，当消费者结束后可以看到队列就删除了
        String QUEUE_NAME = channel.queueDeclare().getQueue();
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.DIRECT);
        // 在消费者端队列绑定

        // 将一个对列绑定多个路由键
        String[] routingKeys = {"debug", "info"};
        for (int i = 0; i < routingKeys.length; i++) {
            channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, routingKeys[i]);
        }

        System.out.println("Consumer Wating Receive Message");

        Consumer consumer = new DefaultConsumer(channel){
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                String message = new String(body, "UTF-8");
                System.out.println(" [C] Received '" + message + "', 处理业务中...");
            }
        };

        channel.basicConsume(QUEUE_NAME, true, consumer);

        Thread.sleep(1000000);
    }
}

消费者2

public class Consumer2 {
    @Test
    public void testBasicConsumer2() throws Exception{
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("127.0.0.1");
        factory.setPort(AMQP.PROTOCOL.PORT);
        factory.setUsername("mengday");
        factory.setPassword("mengday");

        Connection connection = factory.newConnection();
        final Channel channel = connection.createChannel();


        String EXCHANGE_NAME = "exchange.direct.routing";
        // 生成一个随机的名称
        String QUEUE_NAME = channel.queueDeclare().getQueue();
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.DIRECT);
        // 在消费者端队列绑定

        // 将一个对列绑定多个路由键
        String[] routingKeys = {"warning", "error"};
        for (int i = 0; i < routingKeys.length; i++) {
            channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, routingKeys[i]);
        }

        System.out.println("Consumer Wating Receive Message");

        Consumer consumer = new DefaultConsumer(channel){
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                String message = new String(body, "UTF-8");
                System.out.println(" [C] Received '" + message + "', 处理业务中...");
            }
        };

        channel.basicConsume(QUEUE_NAME, true, consumer);

        Thread.sleep(1000000);
    }
}

运行结果

分享一个朋友的人工智能教程。比较通俗易懂，风趣幽默，感兴趣的朋友可以去看看。