SpringBoot自定义Redis实现缓存序列化详解

public class RedisTemplate<K, V> extends RedisAccessor implements RedisOperations<K, V>, BeanClassLoaderAware {
    // 声明了key、value的各种序列化方式，初始值为空
    @Nullable
    private RedisSerializer keySerializer = null;
    @Nullable
    private RedisSerializer valueSerializer = null;
    @Nullable
    private RedisSerializer hashKeySerializer = null;
    @Nullable
    private RedisSerializer hashValueSerializer = null;
...
    // 进行默认序列化方式设置，设置为JDK序列化方式
    public void afterPropertiesSet() {
        super.afterPropertiesSet();
        boolean defaultUsed = false;
        if (this.defaultSerializer == null) {
            this.defaultSerializer = new JdkSerializationRedisSerializer(
                    this.classLoader != null ?
                            this.classLoader : this.getClass().getClassLoader());
        }
        ...
    }
        ...
}

public class RedisAutoConfiguration {
    @Bean
    @ConditionalOnMissingBean(
            name = {"redisTemplate"}
    )
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
        RedisTemplate<Object, Object> template = new RedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }
...
}

@Configuration
public class RedisConfig {
    // 自定义RedisTemplate
    @Bean
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<Object, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(redisConnectionFactory);
        // 创建一个JSON格式序列化对象，对缓存数据的key和value进行转换
        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);
        // 设置RedisTemplate模板api序列化方式为json
        template.setDefaultSerializer(jackson2JsonRedisSerializer);
        return template;
    }
}

@Configuration
class RedisCacheConfiguration {
    @Bean
    public RedisCacheManager cacheManager(RedisConnectionFactory redisConnectionFactory, ResourceLoader resourceLoader) {
        RedisCacheManagerBuilder builder = RedisCacheManager
                .builder(redisConnectionFactory)
                .cacheDefaults(this.determineConfiguration(resourceLoader.getClassLoader()));
        List<String> cacheNames = this.cacheProperties.getCacheNames();
        if (!cacheNames.isEmpty()) {
            builder.initialCacheNames(new LinkedHashSet(cacheNames));
        }
        return (RedisCacheManager) this.customizerInvoker.customize(builder.build());
    }
    private org.springframework.data.redis.cache.RedisCacheConfiguration
    determineConfiguration(ClassLoader classLoader) {
        if (this.redisCacheConfiguration != null) {
            return this.redisCacheConfiguration;
        } else {
            Redis redisProperties = this.cacheProperties.getRedis();
            org.springframework.data.redis.cache.RedisCacheConfiguration config = org.springframework.data.redis.cache.RedisCacheConfiguration.defaultCacheConfig();
            config = config.serializeValuesWith(SerializationPair.fromSerializer(
                            new JdkSerializationRedisSerializer(classLoader)));
            ...
            return config;
        }
    }
}

    @Bean
    public RedisCacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
        // 分别创建String和JSON格式序列化对象，对缓存数据key和value进行转换
        RedisSerializer<String> strSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer jacksonSerial = 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);
        om.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY); // 上面注释过时代码的替代方法
        jacksonSerial.setObjectMapper(om);
        // 定制缓存数据序列化方式及时效
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
                .entryTtl(Duration.ofDays(1)) // 设置缓存数据的时效（设置为了1天）
                .serializeKeysWith(RedisSerializationContext.SerializationPair
                        .fromSerializer(strSerializer)) // 对当前对象的key使用strSerializer这个序列化对象，进行转换
                .serializeValuesWith(RedisSerializationContext.SerializationPair
                        .fromSerializer(jacksonSerial)) // 对value使用jacksonSerial这个序列化对象，进行转换
                .disableCachingNullValues();
        RedisCacheManager cacheManager = RedisCacheManager
                .builder(redisConnectionFactory).cacheDefaults(config).build();
        return cacheManager;
    }