SpringCloud分布式微服务b2b2c电子商务（十二）在springboot中用redis实现消息队列

小咪咪 2021-06-22 15:36 172阅读 0赞

准备阶段  
安装redis,可参考我的另一篇文章  
java 1.8  
maven 3.0  
idea  
环境依赖  
创建一个新的springboot工程，了解springcloud架构可以加求求：三五三六二四七二五九。在其pom文件,加入spring-boot-starter-data-redis依赖：

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

创建一个消息接收者  
REcevier类，它是一个普通的类，需要注入到springboot中。

public class Receiver {
        private static final Logger LOGGER = LoggerFactory.getLogger(Receiver.class);
    
        private CountDownLatch latch;
    
        @Autowired
        public Receiver(CountDownLatch latch) {
            this.latch = latch;
        }
    
        public void receiveMessage(String message) {
            LOGGER.info("Received <" + message + ">");
            latch.countDown();
        }
    }

注入消息接收者

@Bean
        Receiver receiver(CountDownLatch latch) {
            return new Receiver(latch);
        }
    
        @Bean
        CountDownLatch latch() {
            return new CountDownLatch(1);
        }
    
        @Bean
        StringRedisTemplate template(RedisConnectionFactory connectionFactory) {
            return new StringRedisTemplate(connectionFactory);
        }

注入消息监听容器  
在spring data redis中，利用redis发送一条消息和接受一条消息，需要三样东西：

一个连接工厂  
一个消息监听容器  
Redis template  
上述1、3步已经完成，所以只需注入消息监听容器即可：

@Bean
        RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory,
                                                MessageListenerAdapter listenerAdapter) {
    
            RedisMessageListenerContainer container = new RedisMessageListenerContainer();
            container.setConnectionFactory(connectionFactory);
            container.addMessageListener(listenerAdapter, new PatternTopic("chat"));
    
            return container;
        }
    
        @Bean
        MessageListenerAdapter listenerAdapter(Receiver receiver) {
            return new MessageListenerAdapter(receiver, "receiveMessage");
        }

测试  
在springboot入口的main方法：

public static void main(String[] args) throws Exception{
            ApplicationContext ctx =  SpringApplication.run(SpringbootRedisApplication.class, args);
    
            StringRedisTemplate template = ctx.getBean(StringRedisTemplate.class);
            CountDownLatch latch = ctx.getBean(CountDownLatch.class);
    
            LOGGER.info("Sending message...");
            template.convertAndSend("chat", "Hello from Redis!");
    
            latch.await();
    
            System.exit(0);
        }