这篇文章主要讲述如何在springboot中用reids实现消息队列。
准备阶段
安装redis
java 1.8
maven 3.0
idea
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 <Hello from Redis!>
测试通过，接收者确实接收到了发送者的消息。
