解决Redis序列化LocaDate、LocalDateTime异常

最新推荐文章于 2025-03-26 08:54:45 发布

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最新推荐文章于 2025-03-26 08:54:45 发布

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本文链接：https://blog.youkuaiyun.com/Trishia/article/details/109248957

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本文介绍了在Spring Boot应用中遇到LocalDate类型的字段在Redis中反序列化失败的问题，原因是缺少对应的模块支持。解决方案是引入Jackson的相关依赖，并在Redis配置中设置ObjectMapper，启用Java 8时间模块，确保LocalDate能正确序列化和反序列化。配置完成后，实体类中的LocalDate和LocalDateTime字段在Redis存储和读取时会自动转换。

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异常信息

springframework.data.redis.serializer.SerializationException: Could not read JSON: Cannot construct instance of `java.time.LocalDate` 
(no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator) at [Source: (byte[])"
{"@class":"com.millibuff.ow.dto.response.system.JobResp","id":1316915378092826626,"jobName":"初级前端开发工程师","deptId":1,"deptName":"信息化部","posiId":2,"posiName":"前端开发工程师","expCode":"005","expValue":"1-3年","eduCode":"20","eduValue":"本科","salaryCode":"005","salaryValue":"10-20k",
"endTime":{"year":2021,"month":"MAY","dayOfMonth":1,"monthValue":5,"dayOfWeek":"SATURDAY","era":["java.time.chrono.IsoEra","CE"],"dayOfYear":121,"leapYear":false,
"chronology":{"id":""[truncated 344 bytes]; line: 1, column: 330] (through reference chain: com.millibuff.ow.dto.response.system.JobResp["endTime"]);
 nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `java.time.LocalDate` 
 (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)

endTime (LocalDate类型)

{
    "endTime":{
        "year":2021,
        "month":"MAY",
        "dayOfMonth":1,
        "monthValue":5,
        "dayOfWeek":"SATURDAY",
        "era":[
            "java.time.chrono.IsoEra",
            "CE"
        ],
        "dayOfYear":121,
        "leapYear":false,
        "chronology":{
            "id":"ISO",
            "calendarType":"iso8601"
        }
}

解决办法

pom.xml文件导入坐标

        <dependency>
            <groupId>com.fasterxml.jackson.module</groupId>
            <artifactId>jackson-module-parameter-names</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jdk8</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
        </dependency>

编写Redis配置文件

	//其它的不用管,无论你的Redis配置文件是什么，找到返回RedisTemplate的地方
	@Bean
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory cf) {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
        redisTemplate.setConnectionFactory(cf);
        redisTemplate.setValueSerializer(RedisSerializer.json());
        redisTemplate.setHashValueSerializer(RedisSerializer.string());
        redisTemplate.setKeySerializer(RedisSerializer.string());
        redisTemplate.setHashKeySerializer(RedisSerializer.string());
        redisTemplate.afterPropertiesSet();
        //将这段代码添加进去==================================================
        Jackson2JsonRedisSerializer<Object> serializer = new Jackson2JsonRedisSerializer<>(Object.class);
        ObjectMapper objectMapper = new ObjectMapper()
                .registerModule(new ParameterNamesModule())
                .registerModule(new Jdk8Module())
                .registerModule(new JavaTimeModule());
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        serializer.setObjectMapper(objectMapper);
        redisTemplate.setValueSerializer(serializer);
        //===================================================================
        return redisTemplate;
    }

配置完成后就可以了，不需要做任何事情，Redis在进行序列化存储的时候，发现类型为LocalDate/LocalDateTime时，就自动帮我们转换了。

// 实体类什么都不用做
private LocalDate endTime; //结束时间
private LocalDateTime createTime; // 创建时间