Spring Boot Redis序列化LocalDateTime问题

问题

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?)

解决方法

pom.xml

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.16.2</version>
</dependency>

RedisConfig

@Configuration
public class RedisConfig {

    @Bean
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(lettuceConnectionFactory);

        // Redis序列化Java8中LocalDateTime问题
        ObjectMapper objectMapper = new ObjectMapper();

        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); // 必须设置，否则无法将JSON转化为对象，会转化成Map类型

        objectMapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL); // 自定义ObjectMapper的时间处理模块

        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        javaTimeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
        javaTimeModule.addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
        objectMapper.registerModule(javaTimeModule); // 禁用将日期序列化为时间戳的行为
        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);

        GenericJackson2JsonRedisSerializer jackson2JsonRedisSerializer = new GenericJackson2JsonRedisSerializer(objectMapper);

        // 设置key序列化方式string，RedisSerializer.string() 等价于 new StringRedisSerializer()
        redisTemplate.setKeySerializer(RedisSerializer.string());
        // 设置value的序列化方式json，使用GenericJackson2JsonRedisSerializer替换默认序列化，RedisSerializer.json() 等价于 new GenericJackson2JsonRedisSerializer()
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
        // 设置hash的key的序列化方式
        redisTemplate.setHashKeySerializer(RedisSerializer.string());
        // 设置hash的value的序列化方式
        redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);
        // 使配置生效
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }

}