解决redis序列化java8 LocalDateTime错误的问题

蔚落 2022-06-10 09:07 521阅读 0赞

redis序列化选择方式

<bean id="keySerializer" class="org.springframework.data.redis.serializer.StringRedisSerializer" />
        
        <bean id="valueSerializer" class="org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer" >
        <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
            <property name="connectionFactory" ref="connectionFactory" />
            
            <property name="keySerializer" ref="keySerializer" />
            <property name="valueSerializer" ref="valueSerializer" />
            <property name="hashKeySerializer" ref="keySerializer" />
            <property name="hashValueSerializer" ref="valueSerializer" />
        </bean>

要序列化class Demo

public class Demo {
        private Long id;
        private String name;
        private LocalDateTime time;
        ......
        }

操作存入redis中

@Test
    public void test1() {
         Demo demo = new Demo();
         demo.setId(10000000001L);
         demo.setName("测试序列化");
         demo.setTime(LocalDateTime.now());
        redisTemplate.opsForValue().set("test", demo);
     }

在redis中查看

{
      "@class": "com.karmay3d.Demo",
      "id": 10000000001,
      "name": "测试序列化",
      "time": { "dayOfMonth": 15, "dayOfWeek": "TUESDAY", "dayOfYear": 227, "month": "AUGUST", "monthValue": 8, "year": 2017, "hour": 14, "minute": 45, "second": 51, "nano": 921000000, "chronology": { "@class": "java.time.chrono.IsoChronology", "id": "ISO", "calendarType": "iso8601" } } }

LocalDateTime 存储的方式有问题。然后再从redis中取出Demo

@Test
        public void test2() {
            Demo demo = redisTemplate.opsForValue().get("test");
            System.out.println(demo.getId());
        }

报异常

org.springframework.data.redis.serializer.SerializationException: Could not read JSON: Can not construct instance of java.time.LocalDateTime: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?)
     at [Source: [B@68d651f2; line: 1, column: 81] (through reference chain: com.karmay3d.Demo["time"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of java.time.LocalDateTime: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?)
     at [Source: [B@68d651f2; line: 1, column: 81] (through reference chain: com.karmay3d.Demo["time"])
    ......
    Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of java.time.LocalDateTime: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?)
     at [Source: [B@68d651f2; line: 1, column: 81] (through reference chain: com.karmay3d.Demo["time"])
        at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270)
        at com.fasterxml.jackson.databind.DeserializationContext.instantiationException(DeserializationContext.java:1456)
    ......

这个问题真的是纠结了几天。。。解决办法  
mavan需要的jar包

<dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>${jackson.version}</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>${jackson.version}</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>${jackson.version}</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.datatype</groupId>
        <artifactId>jackson-datatype-jsr310</artifactId>
        <version>${jackson.version}</version>
    </dependency>

LocalDateTime属性加上注解  
@JsonDeserialize(using = LocalDateTimeDeserializer.class)  
@JsonSerialize(using = LocalDateTimeSerializer.class)

public class Demo {
        private Long id;
        private String name;
        @JsonDeserialize(using = LocalDateTimeDeserializer.class)
        @JsonSerialize(using = LocalDateTimeSerializer.class)
        private LocalDateTime time;
        ......
        }

redis再次存入之后结构

{
      "@class": "com.karmay3d.Demo",
      "id": 10000000001,
      "name": "测试序列化",
      "time": [2017,8,15,14,57,37,525000000] }

之后反序列化就可以取出Demo对象了。

[解决这个问题查找的问答][Link 1]

[Link 1]: https://stackoverflow.com/questions/13592467/can-not-deserialize-instance-of-org-joda-time-datetime-or-localdate-out-of-start