rabbitmq(7)通配符模式

Myth丶恋晨 2022-05-29 14:09 207阅读 0赞

### 1、模型 ###

topic实际是direct模式的升级版,topic模式下消息可以通过routingKey匹配的方式对应到消费者。  
匹配规则如下:\#(井号)可以匹配零个或多个单词,\*(星号)可以匹配一个单词。  
![这里写图片描述][20180325163903100]

### 2、代码 ###

#### 2.1、生产者 ####

private final static String EXCHANGE_NAME = "test_topic_exchange";
    
    public static void main(String[] args) throws Exception {
    
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.1.7");
        factory.setUsername("root");
        factory.setPassword("123456");
    
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
    
        /* * 申明交换机, topic */
        channel.exchangeDeclare(EXCHANGE_NAME, "topic");
    
        String message = "Hello world";
    
        /* * routingKey不是任意的,必须是由点分隔的单词列表,例如"stock.usd.nyse","nyse.vmw","quick.orange.rabbit",且最多255个字节 * topic实际是direct模式的升级版,topic模式下消息可以通过routingKey匹配的方式对应到消费者 * 匹配规则如下:#(井号)可以匹配零个或多个单词,*(星号)可以匹配一个单词 * 例如:key1.key2可以匹配key1.*和key1.key2.#,但不能匹配#.key3 */
        String routingKey = "key1.key2";
        channel.basicPublish(EXCHANGE_NAME, routingKey, null, message.getBytes());
        System.out.println(" [x] Sent '" + message + "'");
    
        channel.close();
        connection.close();
    }

#### 2.2、消费者1 ####

private final static String EXCHANGE_NAME = "test_topic_exchange";
    
    public static void main(String[] args) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.1.7");
        factory.setUsername("root");
        factory.setPassword("123456");
    
        Connection connection = factory.newConnection();
        final Channel channel = connection.createChannel();
    
        channel.exchangeDeclare(EXCHANGE_NAME, "topic");
        String queueName = channel.queueDeclare().getQueue();
    
        channel.queueBind(queueName, EXCHANGE_NAME, "key1.*");
    
        System.out.println(" [1] Waiting for messages.");
        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(" [1] Received '" + message + "'");
    
                channel.basicAck(envelope.getDeliveryTag(), false);
            }
        };
        boolean autoAck = false;
        channel.basicConsume(queueName, autoAck, consumer);
    }

#### 2.2、消费者2 ####

private final static String EXCHANGE_NAME = "test_topic_exchange";
    
    public static void main(String[] args) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.1.7");
        factory.setUsername("root");
        factory.setPassword("123456");
    
        Connection connection = factory.newConnection();
        final Channel channel = connection.createChannel();
    
        channel.exchangeDeclare(EXCHANGE_NAME, "topic");
        String queueName = channel.queueDeclare().getQueue();
    
        // 一个消费者可以绑定多个routingKey
        channel.queueBind(queueName, EXCHANGE_NAME, "#.key3");
    
        System.out.println(" [2] Waiting for messages.");
        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(" [2] Received '" + message + "'");
    
                channel.basicAck(envelope.getDeliveryTag(), false);
            }
        };
        boolean autoAck = false;
        channel.basicConsume(queueName, autoAck, consumer);
    }

[20180325163903100]: /images/20220529/06c0e03cc08e44708ec2daa96c59b5a9.png