SpringBoot整合多个RabbitMQ

一、背景

最近项目中需要用到了RabbitMQ来监听消息队列，监听的消息队列的虚拟主机(virtualHost)和队列名(queueName)是不一致的，但是接收到的消息格式相同的。而且可能还存在程序不停机的情况下，动态的增加新的队列(queue)的监听，因此就需要我们自己在程序中实现一种方法实现动态配置RabbitMQ。

二、需求

我们有2个RabbitMQ的配置，在程序启动的时候，动态的配置好这2个RabbitMQ，实现消息的监听。

RabbitMQ的配置信息

host	port	username	password	virtualHost	queueName
47.101.130.164	5672	rabbit-multi-01	rabbit-multi-01	/rabbit-multi-01	queue-rabbit-multi-01
47.101.130.164	5672	rabbit-multi-02	rabbit-multi-02	/rabbit-multi-02	queue-rabbit-multi-02

三、实现思路

1、动态配置RabbitMQ

包括 ConnectionFactory,RabbitAdmin,RabbitTemplate,SimpleMessageListenerContainer等

2、将上方配置好的Bean注入到Spring容器中，之后可能需要用到

向Spring容器中注入Bean的方法

DefaultListableBeanFactory#registerSingleton

DefaultListableBeanFactory#registerBeanDefinition

四、实现步骤

1、引入maven依赖

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-amqp</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

2、创建RabbitProperties用来表示RabbitMQ的配置信息

@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class RabbitProperties {
    private String host;
    private Integer port;
    private String username;
    private String password;
    private String virtualHost;
    private String queueName;
}

3、配置RabbitMQ

配置 ConnectionFactory,RabbitAdmin,RabbitTemplate,SimpleMessageListenerContainer等，并动态注入到Spring容器中

@Configuration
@RequiredArgsConstructor
@Slf4j
public class MultiRabbitMqConfig {

    private final DefaultListableBeanFactory defaultListableBeanFactory;

    private static Map<String, RabbitProperties> multiMqPropertiesMap = new HashMap<String, RabbitProperties>() {
        {
            put("first", RabbitProperties.builder()
                    .host("47.101.130.164")
                    .port(5672)
                    .username("rabbit-multi-01")
                    .password("rabbit-multi-01")
                    .virtualHost("/rabbit-multi-01")
                    .queueName("queue-rabbit-multi-01").build());
            put("second", RabbitProperties.builder()
                    .host("47.101.130.164")
                    .port(5672)
                    .username("rabbit-multi-02")
                    .password("rabbit-multi-02")
                    .virtualHost("/rabbit-multi-02")
                    .queueName("queue-rabbit-multi-02").build());
        }
    };

    @PostConstruct
    public void initRabbitmq() {
        multiMqPropertiesMap.forEach((key, rabbitProperties) -> {

            AbstractBeanDefinition beanDefinition = BeanDefinitionBuilder.genericBeanDefinition(CachingConnectionFactory.class)
                    .addPropertyValue("cacheMode", CachingConnectionFactory.CacheMode.CHANNEL)
                    .addPropertyValue("host", rabbitProperties.getHost())
                    .addPropertyValue("port", rabbitProperties.getPort())
                    .addPropertyValue("username", rabbitProperties.getUsername())
                    .addPropertyValue("password", rabbitProperties.getPassword())
                    .addPropertyValue("virtualHost", rabbitProperties.getVirtualHost())
                    .getBeanDefinition();
            String connectionFactoryName = String.format("%s%s", key, "ConnectionFactory");
            defaultListableBeanFactory.registerBeanDefinition(connectionFactoryName, beanDefinition);
            CachingConnectionFactory connectionFactory = defaultListableBeanFactory.getBean(connectionFactoryName, CachingConnectionFactory.class);

            String rabbitAdminName = String.format("%s%s", key, "RabbitAdmin");
            AbstractBeanDefinition rabbitAdminBeanDefinition = BeanDefinitionBuilder.genericBeanDefinition(RabbitAdmin.class)
                    .addConstructorArgValue(connectionFactory)
                    .addPropertyValue("autoStartup", true)
                    .getBeanDefinition();
            defaultListableBeanFactory.registerBeanDefinition(rabbitAdminName, rabbitAdminBeanDefinition);
            RabbitAdmin rabbitAdmin = defaultListableBeanFactory.getBean(rabbitAdminName, RabbitAdmin.class);
            log.info("rabbitAdmin:[{}]", rabbitAdmin);

            RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
            defaultListableBeanFactory.registerSingleton(String.format("%s%s", key, "RabbitTemplate"), rabbitTemplate);

            SimpleMessageListenerContainer simpleMessageListenerContainer = new SimpleMessageListenerContainer(connectionFactory);
            // 设置监听的队列
            simpleMessageListenerContainer.setQueueNames(rabbitProperties.getQueueName());
            // 指定要创建的并发使用者的数量,默认值是1,当并发高时可以增加这个的数值，同时下方max的数值也要增加
            simpleMessageListenerContainer.setConcurrentConsumers(3);
            // 最大的并发消费者
            simpleMessageListenerContainer.setMaxConcurrentConsumers(10);
            // 设置是否重回队列
            simpleMessageListenerContainer.setDefaultRequeueRejected(false);
            // 设置签收模式
            simpleMessageListenerContainer.setAcknowledgeMode(AcknowledgeMode.MANUAL);
            // 设置非独占模式
            simpleMessageListenerContainer.setExclusive(false);
            // 设置consumer未被 ack 的消息个数
            simpleMessageListenerContainer.setPrefetchCount(1);
            // 设置消息监听器
            simpleMessageListenerContainer.setMessageListener((ChannelAwareMessageListener) (message, channel) -> {
                try {
                    log.info("============> Thread:[{}] 接收到消息:[{}] ", Thread.currentThread().getName(), new String(message.getBody()));
                    log.info("====>connection:[{}]", channel.getConnection());
                    channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
                } catch (Exception e) {
                    log.error(e.getMessage(), e);
                    // 发生异常此处需要捕获到
                    channel.basicNack(message.getMessageProperties().getDeliveryTag(), false, true);
                }
            });
            defaultListableBeanFactory.registerSingleton(String.format("%s%s", key, "SimpleMessageListenerContainer"), simpleMessageListenerContainer);
        });
        new Thread(() -> {
            try {
                TimeUnit.SECONDS.sleep(3);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            RabbitTemplate firstRabbitTemplate = (RabbitTemplate) defaultListableBeanFactory.getBean("firstRabbitTemplate");
            firstRabbitTemplate.convertAndSend("exchange-rabbit-multi-01", "", "first queue message");
            log.info("over...");
        }).start();
    }
}

五、实现效果

六、代码

https://gitee.com/huan1993/rabbitmq/tree/master/rabbitmq-springboot-multi

来源：oschina

链接：https://my.oschina.net/huanoschina/blog/4476034

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