redis配置中jackson处理localdatetime

首先在redis中配置是这样，使用 genericJackson2JsonRedisSerializer 这个序列器，该序列器的特点是，序列化对象时，会将对象的class也存进去。

首先是redis的配置(结合springboot,Ps:这里是2.0版本)

@Configuration
@EnableCaching
public class RedisConfig {
    public static ObjectMapper mapper = new ObjectMapper();
    static {
        serializeCfg(mapper);
    }

    private static void serializeCfg(ObjectMapper objectMapper) {
        JavaTimeModule javaTimeModule = new JavaTimeModule();

        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        javaTimeModule.addSerializer(LocalDateTime.class,
                new LocalDateTimeSerializer(dtf));
        javaTimeModule.addDeserializer(LocalDateTime.class,
                new LocalDateTimeDeserializer(dtf));
        objectMapper.registerModule(javaTimeModule);

        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
        objectMapper.registerModule(simpleModule);
        //必须加上
        objectMapper.activateDefaultTyping(objectMapper.getPolymorphicTypeValidator(),
                ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);

        objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    }

    @Bean
    public CacheManager cacheManager(LettuceConnectionFactory connectionFactory){
        RedisCacheManager.RedisCacheManagerBuilder builder = RedisCacheManager.RedisCacheManagerBuilder
                .fromConnectionFactory(connectionFactory)
                .transactionAware();
        return builder.build();
    }

    @Bean
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory connectionFactory) {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(connectionFactory);
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        //该序列化器会存储class名
        GenericJackson2JsonRedisSerializer genericJackson2JsonRedisSerializer = new GenericJackson2JsonRedisSerializer(mapper);
        redisTemplate.setKeySerializer(stringRedisSerializer);
        redisTemplate.setHashKeySerializer(stringRedisSerializer);
        redisTemplate.setValueSerializer(genericJackson2JsonRedisSerializer);
        redisTemplate.setHashValueSerializer(genericJackson2JsonRedisSerializer);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }

结果：可见localdatetime的字段birthday已经序列化为配置中指定的格式

{
    "@class": "com.test.entity.User",
    "id": "4",
    "name": "测试",
    "account": "test",
    "password": "123456",
    "email": "test@163.com",
    "tel": "12306",
    "birthday": "2021-03-05 12:13:14"
}

参考：https://blog.csdn.net/sinat_38278330/article/details/82150879