笔者曾经对redis键值使用了不一样类型的序列化方法html
用过默认值、JdkSerializationRedisSerializer、StringRedisSerializer还用改如下自定类型的序列化工具类（听说这个比Spring RedisTemplate的序列化、反序列化快）java
import com.dyuproject.protostuff.LinkedBuffer; import com.dyuproject.protostuff.ProtostuffIOUtil; import com.dyuproject.protostuff.Schema; import com.dyuproject.protostuff.runtime.RuntimeSchema; import org.springframework.data.redis.serializer.RedisSerializer; import org.springframework.data.redis.serializer.SerializationException; public class ProtostuffSerializer implements RedisSerializer<Object> { private boolean isEmpty(byte[] data) { return (data == null || data.length == 0); } private final Schema<ProtoWrapper> schema; private final ProtoWrapper wrapper; private final LinkedBuffer buffer; public ProtostuffSerializer() { this.wrapper = new ProtoWrapper(); this.schema = RuntimeSchema.getSchema(ProtoWrapper.class); this.buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE); } @Override public byte[] serialize(Object t) throws SerializationException { if (t == null) { return new byte[0]; } wrapper.data = t; try { return ProtostuffIOUtil.toByteArray(wrapper, schema, buffer); } finally { buffer.clear(); } } @Override public Object deserialize(byte[] bytes) throws SerializationException { if (isEmpty(bytes)) { return null; } ProtoWrapper newMessage = schema.newMessage(); ProtostuffIOUtil.mergeFrom(bytes, newMessage, schema); return newMessage.data; } private static class ProtoWrapper { public Object data; } }
遇到过如下异常：redis
hash操做：java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String，而后此次又换另一个Hash的序列化类spring
template.setHashValueSerializer(new Jackson2JsonRedisSerializer<>(Object.class));
序列化后的缓存以下：编程
由于上次使用ProtostuffSerializer对Hash值进行序列化，进行如下操做报错了缓存
HashOperations<String,String,T> hashOperations = redisTemplate.opsForHash(); if(value instanceof Long || value instanceof Integer|| value instanceof Short||value instanceof Byte) { long longValue = ((Number) value).longValue(); hashOperations.increment(key,field,longValue); } if(value instanceof Float ||value instanceof Double) { double doubleValue = ((Number) value).doubleValue(); Double returned = hashOperations.increment(key, field, -0.005); } return hashOperations;
报错以下：io.lettuce.core.RedisCommandExecutionException: ERR hash value is not a valid floatspringboot
，由于通过ProtostuffSerializer序列化的hash值会变形，编程、\X0A=\X5A\X43\XC格式的数据，进行数值运算报错。app
注意事项：redis端increment操做，只支持double和long，因此数据要进行相关转换。ide
好比笔者代码以下，就会报错：工具
public <T> T getCacheHashValue(String key, String field, Class<T> targetClass) { HashOperations<String,String,T> hashOperations = redisTemplate.opsForHash(); return hashOperations.get(key, field); }
传入
Float balance = cacheService.getCacheHashValue(cacheKey, "balance", Float.class);
报错：
Caused by: java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Float
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参考：