redis的发布订阅功能是什么

redis的发布订阅功能是什么？针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。

序

redis提供了简单的发布订阅功能，对于一些合适的场景(比如不要求消费者不在线时也能收到离线消息)，比起专业的MQ来说，用起来更简单些。本文主要是记录下怎么在SpringBoot里头使用redis的发布订阅功能。

定义生产者

配置

@Bean    MyPublisher redisPublisher(RedisConnectionFactory factory) {        return new MyPublisher( redisTemplate(factory), topic() );    }    @Bean    ChannelTopic topic() {        return new ChannelTopic( "pubsub:queue" );    }

生产者实例

public class MyPublisher {    private final RedisTemplate< String, Object > template;    private final ChannelTopic topic;    private final AtomicLong counter = new AtomicLong( 0 );    public MyPublisher( final RedisTemplate< String, Object > template,                               final ChannelTopic topic ) {        this.template = template;        this.topic = topic;    }    @Scheduled( fixedDelay = 100 )    public void publish() {        template.convertAndSend( topic.getTopic(), "Message " + counter.incrementAndGet() +                ", " + Thread.currentThread().getName() );    }}

定义消费者

配置

//subscribe    @Bean    MessageListenerAdapter messageListener() {        return new MessageListenerAdapter( new MyMessageListener() );    }    @Bean    RedisMessageListenerContainer redisContainer(RedisConnectionFactory factory) {        final RedisMessageListenerContainer container = new RedisMessageListenerContainer();        container.setConnectionFactory(factory);        container.addMessageListener(messageListener(), topic());        return container;    }

消费者实例

public class MyMessageListener implements MessageListener {    @Override    public void onMessage( final Message message, final byte[] pattern ) {        System.out.println( "Message received: " + message.toString() );    }}

运行

  .   ____          _            __ _ _ /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/  ___)| |_)| | | | | || (_| |  ) ) ) )  '  |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot ::        (v1.3.2.RELEASE)2016-02-16 00:14:08.190  INFO 1481 --- [           main] com.codecraft.RedisdemoApplication      : Starting RedisdemoApplication on Jupiter.local with PID 1481 (/Users/codecraft/workspace/redisdemo/target/classes started by codecraft in /Users/codecraft/workspace/redisdemo)2016-02-16 00:14:08.193  INFO 1481 --- [           main] com.codecraft.RedisdemoApplication      : No active profile set, falling back to default profiles: default2016-02-16 00:14:08.242  INFO 1481 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@140e5a13: startup date [Tue Feb 16 00:14:08 CST 2016]; root of context hierarchy2016-02-16 00:14:09.756  INFO 1481 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup2016-02-16 00:14:09.763  INFO 1481 --- [           main] o.s.c.support.DefaultLifecycleProcessor  : Starting beans in phase 02016-02-16 00:14:09.807  INFO 1481 --- [           main] o.s.c.support.DefaultLifecycleProcessor  : Starting beans in phase 21474836472016-02-16 00:14:09.897  INFO 1481 --- [           main] com.codecraft.RedisdemoApplication      : Started RedisdemoApplication in 2.215 seconds (JVM running for 2.589)Message received: "Message 1, pool-1-thread-1"Message received: "Message 2, pool-1-thread-1"Message received: "Message 3, pool-1-thread-1"Message received: "Message 4, pool-1-thread-1"Message received: "Message 5, pool-1-thread-1"Message received: "Message 6, pool-1-thread-1"Message received: "Message 7, pool-1-thread-1"Message received: "Message 8, pool-1-thread-1"Message received: "Message 9, pool-1-thread-1"Message received: "Message 10, pool-1-thread-1"

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