SpringBoot整合Redis实现消息发布与订阅的示例代码

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

@Configuration
public class RedisConfig {
    @Value("${redis.server.nodes}")
    private String redisServerNodes;
 
    @Value("${redis.server.passWord}")
    private String redisServerPassword;
 
    //Redis集群配置,单机的redis注释掉该方法，在application配置文件里面配置就可以了
    @Bean
    public RedisClusterConfiguration getRedisClusterConfiguration() {
 
        RedisClusterConfiguration redisClusterConfiguration = new RedisClusterConfiguration();
 
        String[] serverArray = redisServerNodes.split(",");
        Set<RedisNode> nodes = new HashSet<RedisNode>();
        for (String ipPort : serverArray) {
            String[] ipAndPort = ipPort.split(":");
            nodes.add(new RedisNode(ipAndPort[0].trim(), Integer.parseInt(ipAndPort[1])));
        }
        redisClusterConfiguration.setClusterNodes(nodes);
        RedisPassword pwd = RedisPassword.of(redisServerPassword);
        redisClusterConfiguration.setPassword(pwd);
        return redisClusterConfiguration;
    }
 
    //指定redisTemplate类型，如下为<String, Object>
    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, Object> template = new RedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        // 使用JSON格式序列化对象，对缓存数据key和value进行转换
        Jackson2jsonRedisSerializer<Object> jacksonSeial = new Jackson2JsonRedisSerializer<>(Object.class);
        // 解决查询缓存转换异常的问题
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jacksonSeial.setObjectMapper(objectMapper);
 
        // 设置RedisTemplate模板api的序列化方式为JSON
        template.setDefaultSerializer(jacksonSeial);
        return template;
    }
 
     
    @Bean
    @SuppressWarnings("all")
    public RedisMessageListenerContainer container(RedisConnectionFactory redisConnectionFactory,
                                                   RedisMessageListener listener,
                                                   MessageListenerAdapter adapter) {
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(redisConnectionFactory);
        // 所有的订阅消息，都需要在这里进行注册绑定
        // new PatternTopic(TOPIC_NAME1) 表示发布信息的频道
        // 可以添加多个频道以及配置不同的频道
        container.addMessageListener(listener, new PatternTopic(SystemConstants.TOPIC_NAME1));
        container.addMessageListener(adapter, new PatternTopic(SystemConstants.TOPIC_NAME2));
 
        
        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;
    }
 
    
    @Bean
    public MessageListenerAdapter listenerAdapter(RedisMessageReceiver redisMessageReceiver) {
        MessageListenerAdapter receiveMessage = new MessageListenerAdapter(printMessageReceiver, "onMessage");
        Jackson2JsonRedisSerializer<Object> seria = new Jackson2JsonRedisSerializer<>(Object.class);
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        objectMapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL);
        seria.setObjectMapper(objectMapper);
        receiveMessage.setSerializer(seria);
        return receiveMessage;
    }
}

//方式一：
@Slf4j
@Component
public class RedisMessageListener implements MessageListener {
 
    @Autowired
    private RedisTemplate<String, Object> redisTemplate;
    @Autowired
    private CacheManager cacheManager;
 
    @Override
    public void onMessage(Message message, byte[] pattern) {
    // 接收的topic
    log.info("接收消息频道:" + new String(pattern));
    //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）
    MessageDto<?> messageDto = (MessageDto<?>) redisTemplate.getValueSerializer().deserialize(message.getBody());
    //MessageDto<T>为自己编写的一个消息对象类（如自定义有：String data，String title，T content 等属性）
    log.info("接收消息内容：{}", messageDto);
    //根据消息内容做具体业务逻辑。。。。。。。。。
    //。。。。。。。。。。。。。。。。。。。。。。
    }
}

//方式二
@Slf4j
@Component
public class RedisMessageReceiver {
 
    @Autowired
    private RedisTemplate<String,Object> redisTemplate;
 
    
    public void onMessage(Object messageDto , String topic) {
        // 接收消息频道
        log.info("接收消息频道:" + topic);
        //接收消息内容
        log.info("接收消息内容:{}",messageDto);
    }
}

@Slf4j
@Component
public class RedisMessageUtils {
 
    @Autowired
    private RedisTemplate<String,Object> redisTemplate;
 
    
    public void sendMessage(String topic, Object message) {
        if (!StringUtils.hasText(topic)) {
            return;
        }
        try {
            redisTemplate.convertAndSend(topic, message);
            log.info("发送消息成功，topic：{}，message：{}", topic, message);
        } catch (Exception e) {
            log.info("发送消息失败，topic：{}，message：{}", topic, message);
            e.printStackTrace();
        }
    }
}

@RestController
@RequestMapping("/user")
public class UserController{
 
  @Autowired
  private UserService userService;
 
  @PostMapping("/getUsers")  
  public List<User> queryUsers(@RequestBody UserDto userDto){
   List<User> users=userService.queryUsers(userDto);
   //发送测试消息
   RedisMessageUtils.sendMessage(SystemConstants.TOPIC_NAME2, new MessageDto());
   return users;
  }
}