这篇文章主要讲解了“如何将没有实现Serializable的类存储到Redis中”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“如何将没有实现Serializable的类存储到Redis中”吧！
将实例对象存储到Redis中报错
你有没有遇到过这种情况，需要将实例对象存储到Redis中，但是类的字段包含第三方依赖中的类并且此类没有 implements Serializable。 执行时就会报没有序列化的错：
Caused by: java.lang.IllegalArgumentException: DefaultSerializer requires a Serializable payload but received an object of type [com.entity.UserEntity]at org.springframework.core.serializer.DefaultSerializer.serialize(DefaultSerializer.java:43)at org.springframework.core.serializer.Serializer.serializeToByteArray(Serializer.java:56)at org.springframework.core.serializer.support.SerializingConverter.convert(SerializingConverter.java:60)... 54 more有三种方法如下
ObjectHashMapper
ObjectHashMapper使用对象到哈希映射。
需存redis的类如下：
用户类
@Data@Builder@AllArgsConstructor@NoArgsConstructorpublic class UserEntity { private String username; private Integer age; private Department department; private Date createTime; private List<String> phoneNumber; private Map<String, Object> hobby;}部门类
@Data@Builder@NoArgsConstructor@AllArgsConstructorpublic class Department { private String depId; private String depName; private String parentId;}注意：上面两个类都没有实现序列化
通过ObjectHashMapper的toHash和fromHash实现
List<String> phoneNumbers = new ArrayList<>();phoneNumbers.add("13016541724");phoneNumbers.add("18826173452");Map<String, Object> hobbys = new HashMap<>();hobbys.put("运行", "打羽毛球");hobbys.put("电影", "看电影");UserEntity userEntity = UserEntity.builder().username("张三").age(18).department( Department.builder().depId("djinefn213445nkqk").depName("研发中心").parentId("ncdjkn3j4njndcinw").build()).createTime(new Date()).phoneNumber(phoneNumbers).hobby(hobbys) .build();ObjectHashMapper objectHashMapper = new ObjectHashMapper();Map<byte[], byte[]> map = objectHashMapper.toHash(userEntity);redisTemplate.opsForHash().put("TEST_OBJECT", "a", map);Map<byte[], byte[]> map1 = (Map<byte[], byte[]>) redisTemplate.opsForHash().get("TEST_OBJECT", "a"); UserEntity userEntityRes = (UserEntity) objectHashMapper.fromHash(map1);Jackson2HashMapper
Jackson2HashMapper通过使用FasterXMLJackson为域对象提供Redis哈希映射。可以将顶级属性映射为哈希字段名，也可以选择展平结构。简单类型映射到简单值。复杂类型（嵌套对象、集合、映射等）表示为嵌套JSON。Jackson2HashMapper平展为所有嵌套属性创建单独的哈希条目，并尽可能将复杂类型解析为简单类型。
List<String> phoneNumbers = new ArrayList<>();phoneNumbers.add("13016541724");phoneNumbers.add("18826173452");Map<String, Object> hobbys = new HashMap<>();hobbys.put("运行", "打羽毛球");hobbys.put("电影", "看电影");UserEntity userEntity = UserEntity.builder().username("张三").age(18).department( Department.builder().depId("djinefn213445nkqk").depName("研发中心").parentId("ncdjkn3j4njndcinw").build()).createTime(new Date()).phoneNumber(phoneNumbers).hobby(hobbys) .build();Jackson2HashMapper jackson2HashMapper = new Jackson2HashMapper(true);Map<String, Object> map = jackson2HashMapper.toHash(userEntity);redisTemplate.opsForHash().put("TEST_OBJECT", "a", map);Map<String, Object> map1 = (Map<String, Object>) redisTemplate.opsForHash().get("TEST_OBJECT", "a");UserEntity userEntityRes = (UserEntity) jackson2HashMapper.fromHash(map1);BeanUtilsHashMapper
BeanUtilsHashMapper使用Spring的BeanUtils。
List<String> phoneNumbers = new ArrayList<>();phoneNumbers.add("13016541724");phoneNumbers.add("18826173452");Map<String, Object> hobbys = new HashMap<>();hobbys.put("运行", "打羽毛球");hobbys.put("电影", "看电影");UserEntity userEntity = UserEntity.builder().username("张三").age(18).department( Department.builder().depId("djinefn213445nkqk").depName("研发中心").parentId("ncdjkn3j4njndcinw").build()).createTime(new Date()).phoneNumber(phoneNumbers).hobby(hobbys) .build();BeanUtilsHashMapper beanUtilsHashMapper = new BeanUtilsHashMapper(UserEntity.class);Map<String, Object> map = beanUtilsHashMapper.toHash(userEntity);redisTemplate.opsForHash().put("TEST_OBJECT", "a", map);Map<String, Object> map1 = (Map<String, Object>) redisTemplate.opsForHash().get("TEST_OBJECT", "a");UserEntity userEntityRes = (UserEntity) beanUtilsHashMapper.fromHash(map1);运行会报
Caused by: org.apache.commons.beanutils.ConversionException: Can't convert value '' to type interface java.util.Listat org.apache.commons.beanutils.converters.AbstractConverter.conversionException(AbstractConverter.java:474)at org.apache.commons.beanutils.converters.StringConverter.convertToType(StringConverter.java:96)at org.apache.commons.beanutils.converters.AbstractConverter.handleMissing(AbstractConverter.java:312)... 58 more从报错中可以看出，List为interface，无法转换。将List改为ArrayList,Map改为HashMap再执行报如下错误
Caused by: org.apache.commons.beanutils.ConversionException: Can't convert value '' to type class java.util.ArrayListat org.apache.commons.beanutils.converters.AbstractConverter.conversionException(AbstractConverter.java:474)at org.apache.commons.beanutils.converters.StringConverter.convertToType(StringConverter.java:96)at org.apache.commons.beanutils.converters.AbstractConverter.handleMissing(AbstractConverter.java:312)... 58 more排查会发现，phoneNumber的两个手机号码toHash后变成了一个手机号码
这是BeanUtilsHashMapper的一个缺陷。
感谢各位的阅读，以上就是“如何将没有实现Serializable的类存储到Redis中”的内容了，经过本文的学习后，相信大家对如何将没有实现Serializable的类存储到Redis中这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是编程网，小编将为大家推送更多相关知识点的文章，欢迎关注！
