Java springboot B2B2C o2o多用戶商城 springcloud架構（十四）在springboot中用redis實現消息隊列

時間 2019-11-06

標籤 java springboot b2b2c o2o 多用戶商城 springcloud 架構十四中用 redis 實現消息隊列欄目 Java 简体版

原文原文鏈接

準備階段

安裝redis,可參考個人另外一篇文章。
java 1.8
maven 3.0
idea

環境依賴

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

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

建立一個消息接收者

REcevier類，它是一個普通的類，須要注入到springboot中。redis

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);
    }

注入消息監聽容器

在spring data redis中，利用redis發送一條消息和接受一條消息，須要三樣東西：spring

一個鏈接工廠
一個消息監聽容器
Redis template

上述一、3步已經完成，因此只需注入消息監聽容器便可：springboot

@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：架構

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);
    }

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