标签:puts 指定 sim jedis color cep 现在 res his
先说现象吧,通过redisTemplate下的opsForHash方法存储hash类型的值,操作成功以后,去redis控制台显示keys * 的时候,发现一个奇怪的现象,插入的hash类型的key前面会有一堆的\xac\xed\x00\x05t\x00\tb 这种东西,见图1:
分析spring-data的org.springframework.data.redis.core.RedisTemplate源代码以后发现:
private RedisSerializer<?> defaultSerializer = new JdkSerializationRedisSerializer(); private RedisSerializer keySerializer = null; private RedisSerializer valueSerializer = null; private RedisSerializer hashKeySerializer = null; private RedisSerializer hashValueSerializer = null; private RedisSerializer<String> stringSerializer = new StringRedisSerializer();
因为spring操作redis是在jedis客户端基础上进行的,而jedis客户端与redis交互的时候协议中定义是用byte类型交互,jedis中提供了string类型转为byte[]类型,但是看到spring-data-redis中RedisTemplate<K, V>在操作的时候k,v是泛型的,所以RedisTemplate中有了上面那段代码,在没有特殊定义的情况下,spring默认采用defaultSerializer = new JdkSerializationRedisSerializer();来对key,value进行序列化操作,在经过查看JdkSerializationRedisSerializer中对序列化的一系列操作,发现如下代码:
private Converter<Object, byte[]> serializer = new SerializingConverter(); public byte[] serialize(Object object) { if (object == null) { return SerializationUtils.EMPTY_ARRAY; } try { return serializer.convert(object); } catch (Exception ex) { throw new SerializationException("Cannot serialize", ex); } }
序列化支持的是Object对象,调用了SerializingConverter类下的convert方法转换对象,转换对象的方法是:
private final Serializer<Object> serializer; /** * Serializes the source object and returns the byte array result. */ public byte[] convert(Object source) { ByteArrayOutputStream byteStream = new ByteArrayOutputStream(128); try { this.serializer.serialize(source, byteStream); return byteStream.toByteArray(); } catch (Throwable ex) { throw new SerializationFailedException("Failed to serialize object using " + this.serializer.getClass().getSimpleName(), ex); } }
原因其实就出现在这里,解决的办法就是手动定义序列化的方法,spring-data-redis中还提供了一个序列化的类专门针对string类型的序列化org.springframework.data.redis.serializer.StringRedisSerializer这个类,可以在xml里面指定:
@Bean public RedisTemplate<String, Serializable> serialRedisTemplate(){ RedisTemplate<String, Serializable> template = new RedisTemplate<>(); template.setKeySerializer(new StringRedisSerializer()); template.setHashKeySerializer(new StringRedisSerializer()); template.setValueSerializer(new GenericJackson2JsonRedisSerializer()); template.setHashValueSerializer(new GenericJackson2JsonRedisSerializer()); template.setConnectionFactory(palmRedisConnectionFactory()); return template; }
修改后,的存储结果:
标签:puts 指定 sim jedis color cep 现在 res his
原文地址:https://www.cnblogs.com/duanxz/p/12074310.html