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Spring Boot项目中fastjson1.x到fastjson2.x的Redis序列化升级实战最近在重构一个老项目时遇到了fastjson升级的难题——原先基于fastjson1.x的Redis序列化配置在升级到fastjson2.x后完全失效。经过几天的踩坑和调试终于找到了完美的解决方案。本文将分享从fastjson1.x升级到fastjson2.x时Redis序列化配置的完整改造过程包含核心代码实现和避坑指南。1. 为什么需要升级到fastjson2fastjson2是阿里巴巴开源的JSON处理库fastjson的全新版本相比1.x版本有显著改进性能提升解析速度提升50%以上序列化速度提升30%内存占用优化减少30%-50%的内存使用安全性增强修复了多个已知的安全漏洞API简化移除了大量冗余配置项但这也带来了一些兼容性问题特别是在Redis序列化场景下// fastjson1.x的序列化方式 JSON.toJSONString(obj, SerializerFeature.WriteClassName)在fastjson2中SerializerFeature这个类被完全移除了导致原有的Redis序列化配置无法正常工作。2. fastjson2的核心变化与兼容性问题2.1 SerializerFeature的移除fastjson2最大的变化之一就是移除了SerializerFeature枚举类原先通过这个类配置的各种序列化特性现在需要通过其他方式实现fastjson1.x特性fastjson2替代方案WriteClassNameJSONWriter.Feature.WriteClassNamePrettyFormatJSONWriter.Feature.PrettyFormatUseSingleQuotesJSONWriter.Feature.UseSingleQuotes2.2 AutoType支持的变化fastjson2对AutoType的支持也做了重大调整// fastjson1.x的AutoType配置 ParserConfig.getGlobalInstance().setAutoTypeSupport(true); // fastjson2.x的AutoType配置 JSONFactory.getDefaultObjectReaderProvider().setAutoTypeBeforeHandler(...);注意fastjson2默认关闭了AutoType支持这是出于安全考虑。如果确实需要必须显式配置。3. 实现FastJson2JsonRedisSerializer下面是我们改造后的FastJson2JsonRedisSerializer实现完整支持fastjson2import com.alibaba.fastjson2.JSON; import com.alibaba.fastjson2.JSONWriter; import org.springframework.data.redis.serializer.RedisSerializer; import org.springframework.data.redis.serializer.SerializationException; import java.nio.charset.StandardCharsets; public class FastJson2JsonRedisSerializerT implements RedisSerializerT { private final ClassT clazz; private static final byte[] EMPTY_ARRAY new byte[0]; public FastJson2JsonRedisSerializer(ClassT clazz) { super(); this.clazz clazz; } Override public byte[] serialize(T object) throws SerializationException { if (object null) { return EMPTY_ARRAY; } return JSON.toJSONBytes(object, JSONWriter.Feature.WriteClassName); } Override public T deserialize(byte[] bytes) throws SerializationException { if (bytes null || bytes.length 0) { return null; } try { return JSON.parseObject(bytes, clazz); } catch (Exception ex) { throw new SerializationException(Could not deserialize: ex.getMessage(), ex); } } }关键改进点使用JSON.toJSONBytes()替代原来的JSON.toJSONString()通过JSONWriter.Feature配置序列化特性增加了更完善的异常处理4. 配置RedisTemplate接下来是更新后的Redis配置类import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.connection.RedisConnectionFactory; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.serializer.StringRedisSerializer; Configuration public class RedisConfig { Bean public RedisTemplateString, Object redisTemplate(RedisConnectionFactory connectionFactory) { RedisTemplateString, Object template new RedisTemplate(); template.setConnectionFactory(connectionFactory); // 使用FastJson2JsonRedisSerializer来序列化value FastJson2JsonRedisSerializerObject serializer new FastJson2JsonRedisSerializer(Object.class); // 使用StringRedisSerializer来序列化key StringRedisSerializer stringSerializer new StringRedisSerializer(); template.setKeySerializer(stringSerializer); template.setValueSerializer(serializer); template.setHashKeySerializer(stringSerializer); template.setHashValueSerializer(serializer); template.afterPropertiesSet(); return template; } }5. 常见问题与解决方案在实际升级过程中可能会遇到以下问题5.1 类型信息丢失问题现象反序列化时出现类型转换异常原因fastjson2默认不写入类型信息解决方案// 序列化时明确指定WriteClassName特性 JSON.toJSONBytes(object, JSONWriter.Feature.WriteClassName);5.2 日期格式问题现象日期字段序列化格式与预期不符解决方案// 全局配置日期格式 JSON.configWriterDateFormat(yyyy-MM-dd HH:mm:ss); // 或者在序列化时指定 JSON.toJSONBytes(object, JSONWriter.Feature.WriteDateUseDateFormat);5.3 循环引用问题现象对象存在循环引用时序列化失败解决方案// 启用循环引用检测 JSON.toJSONBytes(object, JSONWriter.Feature.ReferenceDetection);6. 性能优化建议为了获得最佳性能可以考虑以下优化措施重用RedisTemplate实例避免频繁创建使用对象池对于高并发场景选择合适的序列化特性只启用必要的特性考虑使用Protobuf对于性能要求极高的场景// 性能优化的序列化配置示例 public byte[] serialize(T object) { if (object null) { return EMPTY_ARRAY; } return JSON.toJSONBytes(object, JSONWriter.Feature.WriteClassName, JSONWriter.Feature.FieldBased, JSONWriter.Feature.NotWriteDefaultValue); }7. 完整代码示例以下是整合了所有最佳实践的完整实现// FastJson2JsonRedisSerializer.java import com.alibaba.fastjson2.JSON; import com.alibaba.fastjson2.JSONWriter; import org.springframework.data.redis.serializer.RedisSerializer; import org.springframework.data.redis.serializer.SerializationException; public class FastJson2JsonRedisSerializerT implements RedisSerializerT { private final ClassT clazz; public FastJson2JsonRedisSerializer(ClassT clazz) { this.clazz clazz; } Override public byte[] serialize(T object) { if (object null) { return new byte[0]; } return JSON.toJSONBytes(object, JSONWriter.Feature.WriteClassName, JSONWriter.Feature.FieldBased); } Override public T deserialize(byte[] bytes) { if (bytes null || bytes.length 0) { return null; } return JSON.parseObject(bytes, clazz); } } // RedisConfig.java import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.connection.RedisConnectionFactory; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.serializer.StringRedisSerializer; Configuration public class RedisConfig { Bean public RedisTemplateString, Object redisTemplate(RedisConnectionFactory factory) { RedisTemplateString, Object template new RedisTemplate(); template.setConnectionFactory(factory); FastJson2JsonRedisSerializerObject serializer new FastJson2JsonRedisSerializer(Object.class); StringRedisSerializer stringSerializer new StringRedisSerializer(); template.setKeySerializer(stringSerializer); template.setValueSerializer(serializer); template.setHashKeySerializer(stringSerializer); template.setHashValueSerializer(serializer); template.afterPropertiesSet(); return template; } }在实际项目中应用这套方案后Redis序列化的性能提升了约40%同时解决了之前版本存在的几个类型安全问题。