Springboot使用Redis中ZSetOperations实现博客访问量

spring:
  redis:
    host: 127.0.0.1
    port: 6379
    password: 12345678

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

@Configuration
public class RedisConfig {
  @Bean("redisTemplate")
  public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {
      // 1.创建RedisTemplate对象
      RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
      // 2.加载Redis配置
      redisTemplate.setConnectionFactory(lettuceConnectionFactory);
      // 3.配置key序列化
      RedisSerializer<?> stringRedisSerializer = new StringRedisSerializer();
      redisTemplate.setKeySerializer(stringRedisSerializer);
      redisTemplate.setHashKeySerializer(stringRedisSerializer);
      // 4.配置Value序列化
      Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);
      ObjectMapper objMapper = new ObjectMapper();
      objMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
      objMapper.activateDefaultTyping(objMapper.getPolymorphicTypeValidator(), ObjectMapper.DefaultTyping.NON_FINAL);
      jackson2JsonRedisSerializer.setObjectMapper(objMapper);
      redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
      redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);
      // 5.初始化RedisTemplate
      redisTemplate.afterPropertiesSet();
      return redisTemplate;
  }
  @Bean
  public ZSetOperations<String, Object> zSetOperations(RedisTemplate<String, Object> redisTemplate) {
    return redisTemplate.opsForZSet();
  }
}

 @Autowired
  private RedisTemplate redisTemplate;
 @Autowired
  private ZSetOperations zSetOperations;

     //这个完全采用redis设计就可以 不用查询数据库 把阅读量完全加入到缓存中  
    public void updateReadCount(Integer blogId) {
        zSetOperations.incrementScore(BLOG_KEY, blogId, 1);
        //blogMapper.updateReadCount(blogId); 不用在mysql数据库更新了
    }

    public List<Blog> selectTop() {
        List<Blog> blogList = new ArrayList<>();
        Long size = zSetOperations.size(BLOG_KEY);
        Set<Object> zset;
        if(size > TopN){
            zset = zSetOperations.reverseRange(BLOG_KEY, 0, TopN - 1);
        }else{
            zset = zSetOperations.reverseRange(BLOG_KEY, 0, - 1);
        }
        for(Object x:zset){
            blogList.add(blogMapper.selectById((int)x));
        }
        return blogList;
    }

        Double score = zSetOperations.score(BLOG_KEY, blog.getId());
        int readCount = (score != null) ? score.intValue() : 0;
        blog.setReadCount(readCount);