Redis反序列化LocalDateTime时报错

报错信息

Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `java.time.LocalDateTime` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)

查看后发现是数据从redis中取出时，Jackson2反序列化数据处理LocalDateTime类型时出错，原因是：Jackson2在序列化LocalDateTime时输出的不是普通的字符串时间格式，而是如下所示的格式（普通时间格式：2019-02-27 12:10:17）。

"registeredTime": {
    "nano": 251128500,
    "year": 2020,
    "monthValue": 2,
    "dayOfMonth": 15,
    "hour": 16,
    "minute": 17,
    "second": 2,
    "month": "FEBRUARY",
    "dayOfWeek": "SATURDAY",
    "dayOfYear": 46,
    "chronology": {
      "@class": "java.time.chrono.IsoChronology",
      "id": "ISO",
      "calendarType": "iso8601"
    }
  }

所以是Jackson2序列化LocalDateTime跟我们所预想的不一致，将注册给redis的序列化模板修改成以下就行。

 1 import com.example.redis.pojo.User;
 2 import com.fasterxml.jackson.annotation.JsonAutoDetect;
 3 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 4 import com.fasterxml.jackson.annotation.PropertyAccessor;
 5 import com.fasterxml.jackson.databind.ObjectMapper;
 6 import com.fasterxml.jackson.databind.SerializationFeature;
 7 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 8 import org.springframework.context.annotation.Bean;
 9 import org.springframework.context.annotation.Configuration;
10 import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
11 import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
12 import org.springframework.data.redis.core.RedisTemplate;
13 import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
14 import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
15 import org.springframework.data.redis.serializer.StringRedisSerializer;
16 import java.io.Serializable;
17 
18 @Configuration
19 public class RedisConfig {
20 
21     @Bean
22     public RedisTemplate<String, Serializable> redisTemplate(LettuceConnectionFactory connectionFactory) {
23         RedisTemplate<String, Serializable> redisTemplate = new RedisTemplate<>();
24         redisTemplate.setKeySerializer(new StringRedisSerializer());
25         //redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
26         redisTemplate.setConnectionFactory(connectionFactory);
27         //redisTemplate.setConnectionFactory(new JedisConnectionFactory());
28 
29         //下面代码解决LocalDateTime序列化与反序列化不一致问题
30         Jackson2JsonRedisSerializer<Object> j2jrs = new Jackson2JsonRedisSerializer<>(Object.class);
31         ObjectMapper om = new ObjectMapper();
32         om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
33         // 解决jackson2无法反序列化LocalDateTime的问题
34         om.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
35         om.registerModule(new JavaTimeModule());
36         om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
37         j2jrs.setObjectMapper(om);
38         // 序列化 value 时使用此序列化方法
39         redisTemplate.setValueSerializer(j2jrs);
40         redisTemplate.setHashValueSerializer(j2jrs);
41 
42         return redisTemplate;
43     }
44 
45 }

转载连接： https://www.cnblogs.com/quec1994/p/10452230.html