解决redis序列化java8 LocalDateTime错误的问题

蔚落 2022-06-10 09:07 628阅读 0赞

redis序列化选择方式

  1. <!-- 缓存序列化方式 -->
  2.     <!--对key的默认序列化器。默认值是StringSerializer-->
  3.     <bean id="keySerializer" class="org.springframework.data.redis.serializer.StringRedisSerializer" />
  4.     <!--是对value的默认序列化器，默认值是取自DefaultSerializer的JdkSerializationRedisSerializer。-->
  5.     <bean id="valueSerializer" class="org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer" >
  6.     <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
  7.         <property name="connectionFactory" ref="connectionFactory" />
  8.         <!-- 这里修改了redis默认的序列化方式 -->
  9.         <property name="keySerializer" ref="keySerializer" />
  10.         <property name="valueSerializer" ref="valueSerializer" />
  11.         <property name="hashKeySerializer" ref="keySerializer" />
  12.         <property name="hashValueSerializer" ref="valueSerializer" />
  13.     </bean>

要序列化class Demo

  1. public class Demo {
  2.     private Long id;
  3.     private String name;
  4.     private LocalDateTime time;
  5.     ......
  6.     }

操作存入redis中

  1. @Test
  2. public void test1() {
  3.      Demo demo = new Demo();
  4.      demo.setId(10000000001L);
  5.      demo.setName("测试序列化");
  6.      demo.setTime(LocalDateTime.now());
  7.     redisTemplate.opsForValue().set("test", demo);
  8.  }

在redis中查看

  1. {
  2.   "@class": "com.karmay3d.Demo",
  3.   "id": 10000000001,
  4.   "name": "测试序列化",
  5.   "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

  1. @Test
  2.     public void test2() {
  3.         Demo demo = redisTemplate.opsForValue().get("test");
  4.         System.out.println(demo.getId());
  5.     }

报异常

  1. 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?)
  2.  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?)
  3.  at [Source: [B@68d651f2; line: 1, column: 81] (through reference chain: com.karmay3d.Demo["time"])
  4. ......
  5. 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?)
  6.  at [Source: [B@68d651f2; line: 1, column: 81] (through reference chain: com.karmay3d.Demo["time"])
  7.     at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270)
  8.     at com.fasterxml.jackson.databind.DeserializationContext.instantiationException(DeserializationContext.java:1456)
  9. ......

这个问题真的是纠结了几天。。。解决办法
mavan需要的jar包

  1. <dependency>
  2.     <groupId>com.fasterxml.jackson.core</groupId>
  3.     <artifactId>jackson-annotations</artifactId>
  4.     <version>${jackson.version}</version>
  5. </dependency>
  6. <dependency>
  7.     <groupId>com.fasterxml.jackson.core</groupId>
  8.     <artifactId>jackson-databind</artifactId>
  9.     <version>${jackson.version}</version>
  10. </dependency>
  11. <dependency>
  12.     <groupId>com.fasterxml.jackson.core</groupId>
  13.     <artifactId>jackson-core</artifactId>
  14.     <version>${jackson.version}</version>
  15. </dependency>
  16. <dependency>
  17.     <groupId>com.fasterxml.jackson.datatype</groupId>
  18.     <artifactId>jackson-datatype-jsr310</artifactId>
  19.     <version>${jackson.version}</version>
  20. </dependency>

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

  1. public class Demo {
  2.     private Long id;
  3.     private String name;
  4.     @JsonDeserialize(using = LocalDateTimeDeserializer.class)
  5.     @JsonSerialize(using = LocalDateTimeSerializer.class)
  6.     private LocalDateTime time;
  7.     ......
  8.     }

redis再次存入之后结构

  1. {
  2.   "@class": "com.karmay3d.Demo",
  3.   "id": 10000000001,
  4.   "name": "测试序列化",
  5.   "time": [2017,8,15,14,57,37,525000000] }

之后反序列化就可以取出Demo对象了。

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