springboot2.x版本自定义CacheManager

引入了redis的starter后，cacheManager变为 RedisCacheManager（缓存放入redis中）；默认创建的 RedisCacheManager 操作redis的时候使用的是 RedisTemplate<Object,Object>，RedisTemplate<Object, Object> 是默认使用jdk的序列化机制，如果需要保存为 json 需要自定义CacheManager

​//声明缓存有效时间参数；
private Duration timeToLive = Duration.ofHours(2);//两小时（毫秒）
//声明pojo方法，类上使用了@ConfigurationProperties注解，可以在全局配置文件中设置缓存有效时间
public void setTimeToLive(Duration timeToLive) {
    this.timeToLive = timeToLive;
}
//自定义CacheManager
@Bean
public RedisCacheManager cacheManager(RedisConnectionFactory factory) {

    RedisSerializer<String> redisSerializer = new StringRedisSerializer();
    Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);

    //解决查询缓存转换异常的问题
    ObjectMapper om = new ObjectMapper();
    om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
    om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
    jackson2JsonRedisSerializer.setObjectMapper(om);

    //配置序列化(解决乱码的问题)
    RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
            .entryTtl(timeToLive)//缓存有效时间
            .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))//设置key的序列化规则
            .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))//设置value的序列化规则
            .disableCachingNullValues();

    RedisCacheManager cacheManager = RedisCacheManager.builder(factory)
            .cacheDefaults(config)
            .build();
    return cacheManager;
}​