SpringBoot 使用redis发布订阅

消息是许多软件架构的重要组成部分。消息传递解决方案提供了高性能，可扩展性，队列持久性和耐用性，故障转移支持等，以及许多更漂亮具备的功能，在Java世界中大多总是使用JMS实现。后来使用Apache ActiveMQ的，有时只是需要简单的排队支持，而Apache ActiveMQ显得过于复杂。事实上，Redis 不仅提供一个NoSQL数据库，同时提供了一套消息系统。

使用Redis作为pub/sub的队列，将消息存放在Redis内存中。

话不多说直接上配置

yml配置

编写监听类来接收订阅的消息

Cat监听

package com.maoxs.listener;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.connection.MessageListener;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

/**
 * 监听发送的消息
 */
@Component
public class CatListener implements MessageListener {

    @Autowired
    RedisTemplate redisTemplate;

    @Override
    public void onMessage(Message message, byte[] bytes) {
        System.out.println("我是Cat监听" + message.toString());
    }
}

Fish监听

package com.maoxs.listener;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.connection.MessageListener;
import org.springframework.data.redis.core.RedisTemplate;

/**
 * 监听发送的消息
 */
public class FishListener implements MessageListener {

    @Autowired
    RedisTemplate redisTemplate;

    @Override
    public void onMessage(Message message, byte[] bytes) {
        System.out.println("我是Fish监听" + message.toString());
    }
}

Redis的相关配置

package com.maoxs.redis;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.maoxs.listener.CatListener;
import com.maoxs.listener.FishListener;
import com.maoxs.pojo.MessageReceiver;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.listener.PatternTopic;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;

import java.util.Arrays;

@SuppressWarnings({"all"})
@Configuration
@EnableCaching
public class CacheConfig extends CachingConfigurerSupport {


    /**
     * redis消息监听器容器
     * 可以添加多个监听不同话题的redis监听器，只需要把消息监听器和相应的消息订阅处理器绑定，该消息监听器
     * 通过反射技术调用消息订阅处理器的相关方法进行一些业务处理
     * @param connectionFactory
     * @param listenerAdapter
     * @return
     */
    @Bean
    //相当于xml中的bean
    RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory,
                                            MessageListenerAdapter CatAdapter, MessageListenerAdapter FishAdapter) {
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        //订阅了一个叫chat 的通道
        container.addMessageListener(CatAdapter, new PatternTopic("cat"));
        container.addMessageListener(FishAdapter, new PatternTopic("fish"));
        //这个container 可以添加多个 messageListener
        return container;
    }

    /**
     * 消息监听器适配器，绑定消息处理器
     *
     * @param receiver
     * @return
     */
    @Bean
    MessageListenerAdapter CatAdapter() {
        return new MessageListenerAdapter(new CatListener());
    }

    /**
     * 消息监听器适配器，绑定消息处理器
     *
     * @param receiver
     * @return
     */
    @Bean
    MessageListenerAdapter FishAdapter() {
        return new MessageListenerAdapter(new FishListener());
    }

    /**
     * redis 读取内容的template
     */
    @Bean
    StringRedisTemplate stringRedisTemplate(RedisConnectionFactory connectionFactory) {
        return new StringRedisTemplate(connectionFactory);
    }

    @Bean
    public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) {
        StringRedisTemplate template = new StringRedisTemplate(factory);

        //定义value的序列化方式
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);


        template.setValueSerializer(jackson2JsonRedisSerializer);
        template.setHashKeySerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
        return template;
    }
}

创建一个定时器模拟发布消息

package com.maoxs.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;


@EnableScheduling //开启定时器功能
@Component
public class MessageSender {

    @Autowired
    @Resource(name = "stringRedisTemplate")
    private StringRedisTemplate stringRedisTemplate;

    @Scheduled(fixedRate = 2000) //间隔2s 通过StringRedisTemplate对象向redis消息队列cat频道发布消息
    public void sendCatMessage(){
        stringRedisTemplate.convertAndSend("cat","猫");
    }

    @Scheduled(fixedRate = 1000) //间隔1s 通过StringRedisTemplate对象向redis消息队列fish频道发布消息
    public void sendFishMessage(){
        stringRedisTemplate.convertAndSend("fish","鱼");
    }

}

最后就是启动类

package com.maoxs;

import org.mybatis.spring.annotation.MapperScan;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;


@SpringBootApplication
@ComponentScan("com.maoxs")
public class DemoApplication {
    private static final Logger LOGGER = LoggerFactory.getLogger(DemoApplication.class);
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

然后就启动看下效果

ok 大功告成!!