SpringBoot非官方教程 | 第十四篇:在springboot中用redis实现消息队列
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原文首发于:https://www.fangzhipeng.com/springboot/2017/07/11/springboot14-redis-mq/
本文出自方志朋的博客
这篇文章主要讲述如何在springboot中用reids实现消息队列。
准备阶段
- 安装redis,可参考我的另一篇文章,5分钟带你入门Redis。
 - java 1.8
 - maven 3.0
 - idea
 
环境依赖
创建一个新的springboot工程,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);
	}
先用redisTemplate发送一条消息,接收者接收到后,打印出来。启动springboot程序,控制台打印:
2017-04-20 17:25:15.536 INFO 39148 — [ main] com.forezp.SpringbootRedisApplication : Sending message…
2017-04-20 17:25:15.544 INFO 39148 — [ container-2] com.forezp.message.Receiver : 》Received <Hello from Redis!>
测试通过,接收者确实接收到了发送者的消息。
源码下载:
https://github.com/forezp/SpringBootLearning
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