在springboot中用redis实现消息队列
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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。
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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
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@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:
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@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:
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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:
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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 |
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