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...