rabbitMQ學習筆記(四)——路由模式

介紹

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直接上圖：

由圖可知，路由模式本質上就是發佈訂閱模式的進階版。具體而言，就是隊列在綁定交換機時可指定一個或者多個RoutingKey。例如：指定了一個叫error的routingkey，那麼該消息隊列就打上一個標記，當發送消息指定了routingkey爲error時，標記位error的隊列就會接受消息。

生產者

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同樣的，生產者代碼與上節區別不大，在這裏有三點需要更改：
1、聲明交換機時，將模式更改爲direct。
2、綁定隊列需要指定routingkey
3、發送消息需要指定routingkey
代碼如下：

public class Producer01 {
    private static final String QUEUENAME01 = "queue01";
    private static final String QUEUENAME02 = "queue02";
    private static final String EXCHANGE_ROUTING_INFO = "exchange_routing";
    private static final String ROUTINGKEY01 = "key01";
    private static final String ROUTINGKEY02 = "key02";

    public static void main(String[] args) throws IOException, TimeoutException {
        
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("127.0.0.1");
        connectionFactory.setPort(5672);
        connectionFactory.setUsername("guest");
        connectionFactory.setPassword("guest");
        connectionFactory.setVirtualHost("/");
        Connection connection = null;
        connection = connectionFactory.newConnection();
        
        Channel channel = connection.createChannel();
        channel.queueDeclare(QUEUENAME01,true,false,false,null);
        channel.queueDeclare(QUEUENAME02,true,false,false,null);
        channel.exchangeDeclare(EXCHANGE_ROUTING_INFO, BuiltinExchangeType.DIRECT);
        channel.queueBind(QUEUENAME01,EXCHANGE_ROUTING_INFO,ROUTINGKEY01);
        channel.queueBind(QUEUENAME02,EXCHANGE_ROUTING_INFO,ROUTINGKEY02);
        
        channel.basicPublish(EXCHANGE_ROUTING_INFO,ROUTINGKEY01,null,"路由模式，發送給一號".getBytes());
        channel.basicPublish(EXCHANGE_ROUTING_INFO,ROUTINGKEY02,null,"路由模式，發送給二號".getBytes());
        System.out.println("send to mq");
        
        channel.close();
        connection.close();
    }

}

消費者

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代碼邏輯與生產者幾乎無異。

public class Consumer01 {

    private static final String QUEUENAME01 = "queue01";
    private static final String EXCHANGE_ROUTING_INFO = "exchange_routing";
    private static final String ROUTINGKEY01 = "key01";

    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("127.0.0.1");
        connectionFactory.setPort(5672);
        connectionFactory.setUsername("guest");
        connectionFactory.setPassword("guest");
        connectionFactory.setVirtualHost("/");
        Connection connection = null;
        connection = connectionFactory.newConnection();
        
        Channel channel = connection.createChannel();
        channel.queueDeclare(QUEUENAME01,true,false,false,null);
        channel.exchangeDeclare(EXCHANGE_ROUTING_INFO, BuiltinExchangeType.DIRECT);
        channel.queueBind(QUEUENAME01,EXCHANGE_ROUTING_INFO,ROUTINGKEY01);

        //實現消費方法
        DefaultConsumer defaultConsumer = new DefaultConsumer(channel){
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                String exchange = envelope.getExchange();
                long deliveryTag = envelope.getDeliveryTag();
                String message = new String(body,"UTF-8");
                System.out.println("交換機:"+exchange+"  消息id"+deliveryTag+"  消息內容"+message);
            }
        };

        //監聽隊列
        channel.basicConsume(QUEUENAME01,true,defaultConsumer);
    }

}