How to integrate a message queue in Spring Boot?

Integrating message queues in Spring Boot typically involves using Spring’s Messaging module and associated libraries. Popular message queues include RabbitMQ, Kafka, and ActiveMQ.

Here, we will use integrating RabbitMQ as an example to explain how to integrate message queues in Spring Boot.

1. configuration file for a Maven project

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-amqp</artifactId>
</dependency>

1. properties file for an application
2. configuration file named application.yml

spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest

1. A template for rabbits

import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class MessageProducer {

    @Autowired
    private RabbitTemplate rabbitTemplate;

    public void sendMessage(String message) {
        rabbitTemplate.convertAndSend("exchangeName", "routingKey", message);
    }
}

1. Listening to RabbitMQ messages

import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;

@Component
public class MessageConsumer {

    @RabbitListener(queues = "queueName")
    public void handleMessage(String message) {
        System.out.println("Received message: " + message);
    }
}

1. send a message
2. name of the queue

Integrating RabbitMQ message queue in Spring Boot is completed in this way. Similar integration methods can be used for other message queues, just replace the corresponding dependencies and configuration information.