public class RedisTemplate<K, V> extends RedisAccessor implements RedisOperations<K, V>, BeanClassLoaderAware {
    // 聲明了key、value的各種序列化方式，初始值為空
    @Nullable
    private RedisSerializer keySerializer = null;
    @Nullable
    private RedisSerializer valueSerializer = null;
    @Nullable
    private RedisSerializer hashKeySerializer = null;
    @Nullable
    private RedisSerializer hashValueSerializer = null;
...
    // 進行默認序列化方式設(shè)置，設(shè)置為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 {
    // 自定義RedisTemplate
    @Bean
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<Object, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(redisConnectionFactory);
        // 創(chuàng)建一個JSON格式序列化對象，對緩存數(shù)據(jù)的key和value進行轉(zhuǎn)換
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        // 解決查詢緩存轉(zhuǎn)換異常的問題
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        // 設(shè)置RedisTemplate模板api序列化方式為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) {
        // 分別創(chuàng)建String和JSON格式序列化對象，對緩存數(shù)據(jù)key和value進行轉(zhuǎn)換
        RedisSerializer<String> strSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer jacksonSerial = new Jackson2JsonRedisSerializer(Object.class);
        // 解決查詢緩存轉(zhuǎn)換異常的問題
        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); // 上面注釋過時代碼的替代方法
        jacksonSerial.setObjectMapper(om);
        // 定制緩存數(shù)據(jù)序列化方式及時效
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
                .entryTtl(Duration.ofDays(1)) // 設(shè)置緩存數(shù)據(jù)的時效（設(shè)置為了1天）
                .serializeKeysWith(RedisSerializationContext.SerializationPair
                        .fromSerializer(strSerializer)) // 對當前對象的key使用strSerializer這個序列化對象，進行轉(zhuǎn)換
                .serializeValuesWith(RedisSerializationContext.SerializationPair
                        .fromSerializer(jacksonSerial)) // 對value使用jacksonSerial這個序列化對象，進行轉(zhuǎn)換
                .disableCachingNullValues();
        RedisCacheManager cacheManager = RedisCacheManager
                .builder(redisConnectionFactory).cacheDefaults(config).build();
        return cacheManager;
    }