訊息是許多軟體架構的重要組成部分。訊息傳遞解決方案提供了高效能，可擴充套件性，佇列永續性和耐用性，故障轉移支援等，以及許多更漂亮具備的功能，在Java世界中大多總是使用JMS實現。後來使用Apache ActiveMQ的，有時只是需要簡單的排隊支援，而Apache ActiveMQ顯得過於複雜。事實上，Redis 不僅提供一個NoSQL資料庫，同時提供了一套訊息系統。

使用Redis作為pub/sub的佇列，將訊息存放在Redis記憶體中。

話不多說直接上配置

yml配置

編寫監聽類來接收訂閱的訊息

Cat監聽

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;

/**
 * 監聽傳送的訊息
 */
 

@Component
public class CatListener implements MessageListener {

    @Autowired
    RedisTemplate redisTemplate;

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

Fish監聽

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;

/**
 * 監聽傳送的訊息
 */
public class FishListener implements MessageListener {

    @Autowired
    RedisTemplate redisTemplate;

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

Redis的相關配置

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訊息監聽器容器
     * 可以新增多個監聽不同話題的redis監聽器，只需要把訊息監聽器和相應的訊息訂閱處理器繫結，該訊息監聽器
     * 通過反射技術呼叫訊息訂閱處理器的相關方法進行一些業務處理
     * @param connectionFactory
     * @param listenerAdapter
     * @return
     */
    @Bean
    //相當於xml中的bean
    RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory,
                                            MessageListenerAdapter CatAdapter, MessageListenerAdapter FishAdapter) {
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        //訂閱了一個叫chat 的通道
        container.addMessageListener(CatAdapter, new PatternTopic("cat"));
        container.addMessageListener(FishAdapter, new PatternTopic("fish"));
        //這個container 可以新增多個 messageListener
        return container;
    }

    /**
     * 訊息監聽器介面卡，繫結訊息處理器
     *
     * @param receiver
     * @return
     */
    @Bean
    MessageListenerAdapter CatAdapter() {
        return new MessageListenerAdapter(new CatListener());
    }

    /**
     * 訊息監聽器介面卡，繫結訊息處理器
     *
     * @param receiver
     * @return
     */
    @Bean
    MessageListenerAdapter FishAdapter() {
        return new MessageListenerAdapter(new FishListener());
    }

    /**
     * redis 讀取內容的template
     */
    @Bean
    StringRedisTemplate stringRedisTemplate(RedisConnectionFactory connectionFactory) {
        return new StringRedisTemplate(connectionFactory);
    }

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

        //定義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;
    }
}

建立一個定時器模擬釋出訊息

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 //開啟定時器功能
@Component
public class MessageSender {

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

    @Scheduled(fixedRate = 2000) //間隔2s 通過StringRedisTemplate物件向redis訊息佇列cat頻道釋出訊息
    public void sendCatMessage(){
        stringRedisTemplate.convertAndSend("cat","貓");
    }

    @Scheduled(fixedRate = 1000) //間隔1s 通過StringRedisTemplate物件向redis訊息佇列fish頻道釋出訊息
    public void sendFishMessage(){
        stringRedisTemplate.convertAndSend("fish","魚");
    }

}

最後就是啟動類

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);
    }

}

然後就啟動看下效果

ok 大功告成!!

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注：如果不對聯絡本寶寶及時改正~~