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

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：

            org.springframework.boot            spring-boot-starter-data-redis        

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);    }