RabbitMq 监听器在两个不同的队列上监听两种不同的消息类型

Question

My requirement is to be able to listen to rabbitMq messages on two different queues. One queue receives message with content_type = text/plain and my Spring boot listener method accepts String parameter. Second queue receives message with content_type = application/json and my listener method accepts parameter of my POJO 'User' type. I am sending messages using RabbitMQ web portal. I am not able to successfully listen to both types of messages in the same spring boot listener application. Please help me to succeed in listening to both types of messages on two queues.Below is my listener class and configuraiton class code snippet.

Listener class:

@Component
public class EventListener {

    public void processFirstQueue(String message) {
        try {
            if (message != null) {
                log.info("Received the message from Queue!");
                service.process(message);
            }
        } catch (Exception e) {
            log.error("Error occurred " + e);
        }
    }
    
    public void processSecondQueue(User user) {
        try {
            if (user!= null) {
                log.info("Received the message from Queue!");
                service.processUser(user);
            }
        } catch (Exception e) {
            log.error("Error occurred " + e);
        }
    }
}

RabbitMqConfig.java
public class RabbitMqConfig {
    
    @Bean(name = "rabbitmq-server")
    public CachingConnectionFactory getConnectionFactory() {
        CachingConnectionFactory cachingConnectionFactory = new CachingConnectionFactory();
        cachingConnectionFactory.setHost("localhost");
        return cachingConnectionFactory;
    }
            
    @Bean
    public SimpleMessageListenerContainer container(ConnectionFactory connectionFactory,
            MessageListenerAdapter listenerAdapter) {
        SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        container.setQueueNames("queue1", "queue2");
        container.setMessageListener(listenerAdapter);
        container.setMessageConverter(new Jackson2JsonMessageConverter());
        return container;
    }

    @Bean
    public MessageListenerAdapter listenerAdapter(OutgoingEventListener receiver) {
        MessageListenerAdapter listener = new MessageListenerAdapter(receiver);
        Map<String, String> queueToMethodName = new HashMap<>();
        queueToMethodName.put("queue1", "processFirstQueue");
        queueToMethodName.put("queue2", "processSecondQueue");
        listener.setQueueOrTagToMethodName(queueToMethodName);
        return listener;
    }
     @Bean
    public MessageConverter jsonMessageConverter(){
        return new Jackson2JsonMessageConverter();
    }
    
     @Bean
    public RabbitTemplate getRabbitTemplate(ConnectionFactory connectionFactory) {
        return new RabbitTemplate(connectionFactory);
    }
    
}

I am able to post json message successfully to queue2 as seen in below screenshot.

But when I am posting content_type = text/plain to queue1 as seen in below screenshot, I am getting error in my Spring boot service saying content-type text is found but json is expected.

Answer 1

Try to add message converter for your consumer like that -

import org.springframework.amqp.rabbit.config.SimpleRabbitListenerContainerFactory;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.amqp.support.converter.MessageConverter;
import org.springframework.boot.autoconfigure.amqp.SimpleRabbitListenerContainerFactoryConfigurer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class RabbitMqConfig {
  
    @Bean
    public MessageConverter jsonMessageConverter(){
        return new Jackson2JsonMessageConverter();
    }
    
    @Bean
    public SimpleRabbitListenerContainerFactory jsaFactory(ConnectionFactory connectionFactory,
            SimpleRabbitListenerContainerFactoryConfigurer configurer) {
        SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
        configurer.configure(factory, connectionFactory);
        factory.setMessageConverter(jsonMessageConverter());
        return factory;
    }
}