• Spring Boot教程(一)在springboot中用redis实现消息队列


    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
    

      

    源码来源

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  • 原文地址:https://www.cnblogs.com/allalongx/p/8477312.html
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