SpringBoot中RedisTemplate订阅发布对象

Posted 2021-02-13 我们的问题主要是读书不多而想得太多

解说

1. RedisMessageListenerContainer Redis订阅发布的监听容器，你的消息发布、订阅配置都必须在这里面实现
   • addMessageListener（MessageListenerAdapter，PatternTopic） 新增订阅频道及订阅者，订阅者必须有相关方法处理收到的消息。
   • setTopicSerializer(RedisSerializer) 对频道内容进行序列化解析

1. MessageListenerAdapter 监听适配器
   • MessageListenerAdapter(Object , defaultListenerMethod) 订阅者及其方法
2. redisTemplate redis模版类
   • convertAndSend（String channel, Object message） 消息发布

问题

1. 多人同时订阅一个频道 有没有更好的实现方式？
   2、一个频道内容广播，有没更好的实现方式？

   代码

   RedisConfig

   核心类，实现了Redis连接，订阅以及发布配置


package com.mengxiangxiang.newtech.redisMQ;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
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;

@Configuration
public class RedisConfig {

@Bean
public RedisTemplate<String,Object> redisTemplate(JedisConnectionFactory redisConnectionFactory){

    RedisTemplate<String,Object> redisTemplate = new RedisTemplate<>();
    redisTemplate.setConnectionFactory(redisConnectionFactory);

    //自定义序列化方式
    Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
    objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
    jackson2JsonRedisSerializer.setObjectMapper(objectMapper);

    redisTemplate.setKeySerializer(jackson2JsonRedisSerializer);
    redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
    redisTemplate.setHashKeySerializer(jackson2JsonRedisSerializer);
    redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);
    redisTemplate.afterPropertiesSet();

    return redisTemplate;
}

/**
 * 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
 */
//MessageListenerAdapter 表示监听频道的不同订阅者
@Bean
RedisMessageListenerContainer container2(RedisConnectionFactory connectionFactory, MessageListenerAdapter listenerAdapter2,MessageListenerAdapter listenerAdapter){
     RedisMessageListenerContainer container = new RedisMessageListenerContainer();
    container.setConnectionFactory(connectionFactory);
    //订阅多个频道
    container.addMessageListener(listenerAdapter2,new PatternTopic("fullDataUpload"));
    container.addMessageListener(listenerAdapter2,new PatternTopic("analysis"));
    container.addMessageListener(listenerAdapter,new PatternTopic("fullDataUpload"));

    //序列化对象（特别注意：发布的时候需要设置序列化；订阅方也需要设置序列化）
    Jackson2JsonRedisSerializer seria = new Jackson2JsonRedisSerializer(Object.class);
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
    objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
    seria.setObjectMapper(objectMapper);

    container.setTopicSerializer(seria);
    return container;
}

 //表示监听一个频道
@Bean
MessageListenerAdapter listenerAdapter(MessageReceiveTwo receiver){
    //这个地方 是给messageListenerAdapter 传入一个消息接受的处理器，利用反射的方法调用“MessageReceiveTwo ”
    return new MessageListenerAdapter(receiver,"getMessage");
}

@Bean
MessageListenerAdapter listenerAdapter2(MessageReceiveOne receiver){
    //这个地方 是给messageListenerAdapter 传入一个消息接受的处理器，利用反射的方法调用“MessageReceiveOne ”
    return new MessageListenerAdapter(receiver,"getMessage");
}

}

被消费的对象(即传输的数据)

User


package com.mengxiangxiang.newtech.hello.entity;

public class User {
private String name;
private String phone;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getPhone() {
    return phone;
}

public void setPhone(String phone) {
    this.phone = phone;
}

}


消费者

MessageReceiveOne

第一个消费者
获取到内容后，是圆是扁随便搓。


package com.mengxiangxiang.newtech.redisMQ;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.feinno.newtech.hello.entity.User;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.stereotype.Component;

@Component
public class MessageReceiveOne {
public void getMessage(String object){
//序列化对象（特别注意：发布的时候需要设置序列化；订阅方也需要设置序列化）
Jackson2JsonRedisSerializer seria = new Jackson2JsonRedisSerializer(User.class);
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
seria.setObjectMapper(objectMapper);

    User user = (User)seria.deserialize(object.getBytes());
    System.out.println("消息客户端2号："+object);
}

}

MessageReceiveTwo

第二个消费者

package com.feinno.newtech.redisMQ;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.mengxiangxiang.newtech.hello.entity.User;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.stereotype.Component;

@Component
public class MessageReceiveTwo {
public void getMessage(String object){
//序列化对象（特别注意：发布的时候需要设置序列化；订阅方也需要设置序列化）
Jackson2JsonRedisSerializer seria = new Jackson2JsonRedisSerializer(User.class);
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
seria.setObjectMapper(objectMapper);

    User user = (User)seria.deserialize(object.getBytes());
    System.out.println("消息客户端2号："+object);
}

}


发布消息


@Test
public void testMQ(){
String channel1 = "fullDataUpload";
String channel2 = "analysis";

    User user = new User();
    user.setPhone("18675830623");
    user.setName("刘大");

    User user2 = new User();
    user2.setPhone("17856232365");
    user2.setName("李二");

    redisTemplate.convertAndSend(channel1,user2);
    redisTemplate.convertAndSend(channel2,user);
}