SpringBoot非官方教程 | 第十四篇:在springboot中用redis实现消息队列

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 

源码下载:

https://github.com/forezp/Spr…

参考资料

messaging-redis

    原文作者:星缘
    原文地址: https://segmentfault.com/a/1190000011628373
    本文转自网络文章,转载此文章仅为分享知识,如有侵权,请联系博主进行删除。
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