springboot（三）使用redis实现消息队列

redis消息队列适合轻量级高并发的情况，比如秒杀，及时数据分析等。

首先springboot配置文件配置如下：

spring:
  redis:
    database: 1
    host: 192.168.94.151
    port: 6379
    password: xuhaixing
    jedis:
      pool:
            max-idle: 8
            min-idle: 0
            max-active: 8
            max-wait: -1
    timeout: 5000
server:
  port: 8081

注册StringRedisTemplate

/**
 * 注册redisTemplate，作为消息队列的发布者
 */
@Configuration
public class PublisherConfig {

    @Bean
    public StringRedisTemplate getRedisTemplate(RedisConnectionFactory redisConnectionFactory) {
        return new StringRedisTemplate(redisConnectionFactory);
    }
}

消息生产者，注入redisTemplate,用convertAndSend发送消息

@Service
public class PublisherService {

    @Autowired
    private StringRedisTemplate redisTemplate;

    public String sendMessage(String name) {
        try {
            redisTemplate.convertAndSend("TOPIC_USERNAME", name);
            return "消息发送成功了";

        } catch (Exception e) {
            e.printStackTrace();
            return "消息发送失败了";
        }
    }
}

 

在controller中注入service,请求时发送消息

@RestController
@RequestMapping("publisher")
public class PublisherController {

    @Autowired
    private PublisherService publisherService;

    @RequestMapping("{name}")
    public String sendMessage(@PathVariable("name") String name) {
        return publisherService.sendMessage(name);
    }
}

 

消费者：创建一个接收消息的类，继承MessageListener，也可以不继承

 

继承：

@Component
public class Receiver implements MessageListener {
    private static Logger logger = LoggerFactory.getLogger(Receiver.class);

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Override
    public void onMessage(Message message, byte[] pattern) {
        RedisSerializer valueSerializer = redisTemplate.getStringSerializer();
        String deserialize = valueSerializer.deserialize(message.getBody());
        logger.info("收到的mq消息" + deserialize);
    }
}

不继承：

@Component
public class Receiver {
    private static Logger logger = LoggerFactory.getLogger(Receiver.class);

    public void receiveMessage(String message) {
        logger.info("收到的mq消息" + message);
    }
}

 

消息订阅者配置类：

@Configuration
@AutoConfigureAfter({Receiver.class})
public class SubscriberConfig {

    /**
     * 消息监听适配器，注入接受消息方法，输入方法名字 反射方法
     *
     * @param receiver
     * @return
     */
    @Bean
    public MessageListenerAdapter getMessageListenerAdapter(Receiver receiver) {
        return new MessageListenerAdapter(receiver, "receiveMessage"); //当没有继承MessageListener时需要写方法名字
    }

    /**
     * 创建消息监听容器
     *
     * @param redisConnectionFactory
     * @param messageListenerAdapter
     * @return
     */
    @Bean
    public RedisMessageListenerContainer getRedisMessageListenerContainer(RedisConnectionFactory redisConnectionFactory, MessageListenerAdapter messageListenerAdapter) {
        RedisMessageListenerContainer redisMessageListenerContainer = new RedisMessageListenerContainer();
        redisMessageListenerContainer.setConnectionFactory(redisConnectionFactory);
        redisMessageListenerContainer.addMessageListener(messageListenerAdapter, new PatternTopic("TOPIC_USERNAME"));
        return redisMessageListenerContainer;
    }
}

 

消费者和生产者配置已经完成了，启动springboot程序，用postman请求controller方法就可以了。

 

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