RedisTemplate默认使用二进制hex的方式进行持久化,它对象的值存储到redis里,当然,你的对象需要先实现java.io.Serializable
接口,这种方式兼容性好,速度快,存储空间小;缺点就是没有可读性,所以就有了json的序列化方式,下面总结一下。
@Test public void hex() { RedisTemplate<String, Object> template = new RedisTemplate<>(); template.setConnectionFactory(factory); //二进制序列化,实体类需要实现Serializable接口 JdkSerializationRedisSerializer jdkSerializationRedisSerializer = new JdkSerializationRedisSerializer(); //序列化 StringRedisSerializer stringRedisSerializer = new StringRedisSerializer(); template.setKeySerializer(stringRedisSerializer); template.setHashKeySerializer(stringRedisSerializer); template.setValueSerializer(jdkSerializationRedisSerializer); template.setHashValueSerializer(jdkSerializationRedisSerializer); template.afterPropertiesSet(); extracted(template, "redis_test111"); User user = (User) template.opsForValue().get("redis_test111"); }
@Test public void jsonStr() throws IOException { RedisTemplate<String, Object> template = new RedisTemplate<>(); template.setConnectionFactory(factory); Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(Object.class); //序列化 jackson2JsonRedisSerializer.setObjectMapper(new ObjectMapper()); StringRedisSerializer stringRedisSerializer = new StringRedisSerializer(); template.setKeySerializer(stringRedisSerializer); template.setHashKeySerializer(stringRedisSerializer); template.setValueSerializer(jackson2JsonRedisSerializer); template.setHashValueSerializer(jackson2JsonRedisSerializer); template.afterPropertiesSet(); extracted(template, "redis_test11"); JsonParser jsonParser = mapper.getFactory().createParser(mapper.writeValueAsBytes(template.opsForValue().get("redis_tesqt"))); User jsonNode = jsonParser.readValueAs(User.class); log.info("user={}", jsonNode); }
RedisTemplate<String, Object> template = new RedisTemplate<String, Object>(); template.setConnectionFactory(factory); Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class); ObjectMapper om = new ObjectMapper(); om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); // 日期序列化处理 om.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS); om.registerModule(new Jdk8Module()) .registerModule(new JavaTimeModule()) .registerModule(new ParameterNamesModule()); //存储java的类型,方便反序列化,没有这行,将存储为纯json字符串 om.activateDefaultTyping( LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.WRAPPER_ARRAY); jackson2JsonRedisSerializer.setObjectMapper(om); StringRedisSerializer stringRedisSerializer = new StringRedisSerializer(); // key采用String的序列化方式 template.setKeySerializer(stringRedisSerializer); // hash的key也采用String的序列化方式 template.setHashKeySerializer(stringRedisSerializer); // value序列化方式采用jackson template.setValueSerializer(jackson2JsonRedisSerializer); // hash的value序列化方式采用jackson template.setHashValueSerializer(jackson2JsonRedisSerializer); template.afterPropertiesSet(); extracted(template, "redis_test1"); User user = (User) template.opsForValue().get("redis_test"); log.info("user={}", user);
综上所述,我认为第三种json对象的方式是比较好的处理方式,在序列化和反序列化,及可读性上都表现不错。