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我正在阅读这篇文章，它说在fanout以外的消息交换中，消息被路由到与其键匹配的队列中。
如果是这样，那么为什么在以下注释中有两个参数（ @Queue value和key ）？ 仅指定队列名称还不够吗？
@RabbitListener(bindings = @QueueBinding(value = @Queue(value = RabbitMQConfiguration.AUTHENTICATION_EMAILS_QUEUE, durable = "true"), exchange = @Exchange(value = RabbitMQConfiguration.EMAIL_MESSAGE_EXCHANGE_NAME), key = "accountActivationEmail"))
public void receiveMessage(Map<String, String> message) {
this.sendEmail(getEmail(message));
}
另一个问题：有了您为侦听器看到的注释，我是否需要有一个单独的@Configuration类来指定MessageListenerAdapter ， SimpleMessageListenerContainer ， Binding ， Exchange和Queue ，如下所示：
@Configuration
public class RabbitMQConfiguration {
public final static String AUTHENTICATION_EMAILS_QUEUE = "AUTHENTICATION_EMAILS_QUEUE";
public final static String EMAIL_MESSAGE_EXCHANGE_NAME = "EMAIL_EVENTS";
@Bean
public Queue authenticationEmailsQueue() {
return new Queue(AUTHENTICATION_EMAILS_QUEUE, false);
}
@Bean
public DirectExchange emailMessagesExchange() {
return new DirectExchange(EMAIL_MESSAGE_EXCHANGE_NAME);
}
@Bean
public Binding authenticationEmailMQBinding(Queue queue, DirectExchange exchange) {
return BindingBuilder.bind(queue).to(exchange).with(AUTHENTICATION_EMAILS_QUEUE);
}
@Bean
public SimpleMessageListenerContainer authenticationEmailContainer(ConnectionFactory connectionFactory,
MessageListenerAdapter listenerAdapter) {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
container.setConnectionFactory(connectionFactory);
container.setQueueNames(AUTHENTICATION_EMAILS_QUEUE);
container.setMessageListener(listenerAdapter);
return container;
}
@Bean
public MessageListenerAdapter authenticationEmailHandlerAdapter(AuthenticationEmailHandler receiver) {
return new MessageListenerAdapter(receiver, "receiveMessage");
}
}
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