如何使用Spring Framework在RabbitMQ Java配置类中设置多个主题？

Question

我正在尝试使用Spring Framework创建RabbitMQ配置类.该文档没有说明如何在TopicExchange中设置多个主题.我怎么做？到目前为止,我有这个Java代码,但我不清楚如何在下面的绑定方法中设置多个主题,因为它只返回一个绑定.如果我需要多个主题,我不需要多个绑定吗？

@Configuration
@EnableRabbit
public class MessageReceiverConfiguration {

    final static String queueName = "identity";
    final static String topic1 = "NewUserSignedUp";
    final static String topic2 = "AccountCreated";

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Bean
    Queue queue() {
        return new Queue(queueName, false);
    }

    @Bean
    TopicExchange exchange() {
        return new TopicExchange("DomainEvents");
    }   

    @Bean
    Binding binding(Queue queue, TopicExchange exchange) {
        // How to setup multiple topics?
        return BindingBuilder.bind(queue).to(exchange).with(topic1);
    }

    @Bean
    SimpleMessageListenerContainer container(ConnectionFactory connectionFactory, MessageListenerAdapter listenerAdapter) {

        SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();

        container.setConnectionFactory(connectionFactory);
        container.setQueueNames(queueName);
        container.setMessageListener(listenerAdapter);
        container.setAcknowledgeMode(AcknowledgeMode.AUTO);

        return container;
    }

    @Bean
    MessageReceiver receiver() {
        return new MessageReceiver();
    }

    @Bean
    MessageListenerAdapter listenerAdapter(MessageReceiver receiver) {
        return new MessageListenerAdapter(receiver, "receiveMessage");
    }    

}

Answer 1

您可以通过更改Binding函数来定义多个绑定,以返回列表而不是单个Binding对象.

@Bean
List<Binding> bindings() {

    return Arrays.AsList(BindingBuilder.bind(queue()).to(exchange()).with(topic1), 
                        BindingBuilder.bind(queue()).to(exchange()).with(topic2));
}

提示:您不需要将队列和交换作为方法参数传递.您可以直接引用bean方法来传递交换和队列的信息.

有关详细信息,请参阅文档