SpringBoot非官方教程 | 第十四篇:在springboot中用redis實現訊息佇列

weixin_33766168發表於2017-10-19

這篇文章主要講述如何在springboot中用reids實現訊息佇列。

準備階段

安裝redis,可參考我的另一篇文章,5分鐘帶你入門Redis。
java 1.8
maven 3.0
idea

環境依賴

建立一個新的springboot工程,在其pom檔案,加入spring-boot-starter-data-redis依賴:

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

建立一個訊息接收者

REcevier類,它是一個普通的類,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();
    }
}

注入訊息接收者

@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);
}

注入訊息監聽容器

在spring data redis中,利用redis傳送一條訊息和接受一條訊息,需要三樣東西:

一個連線工廠
一個訊息監聽容器
Redis template

上述1、3步已經完成,所以只需注入訊息監聽容器即可:

    @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");
    }

測試

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傳送一條訊息,接收者接收到後,列印出來。啟動springboot程式,控制檯列印:

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 

原始碼下載:

https://github.com/forezp/Spr...

參考資料

messaging-redis

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