解決 redis 序列化 java8 LocalDateTime 問題

問題背景

目前項目全面支持JDK1.8，使用 LocalDateTime 代替 Date,原因爲 date 格式化時不安全。

問題描述

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?)

問題分析

GenericJackson2JsonRedisSerializer 解析 出錯

解決方案一（全局）

1. 引入依賴

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.10.3</version>
</dependency>

2. RedisConfiguration 配置文件中修改如下
   關鍵代碼
   om.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
   om.registerModule(new Jdk8Module())
   .registerModule(new JavaTimeModule())
   .registerModule(new ParameterNamesModule());

    @Bean
    @Primary
    public GenericJackson2JsonRedisSerializer genericJackson2JsonRedisSerializer(){
        ObjectMapper om = new ObjectMapper();
        // 解決查詢緩存轉換異常的問題
        om.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        // 支持 jdk 1.8 日期   ---- start ---
        om.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        om.registerModule(new Jdk8Module())
                .registerModule(new JavaTimeModule())
                .registerModule(new ParameterNamesModule());
       // --end --         
        GenericJackson2JsonRedisSerializer  genericJackson2JsonRedisSerializer = new GenericJackson2JsonRedisSerializer(om);
        return genericJackson2JsonRedisSerializer;
    }
    
 	@Bean
    @Primary
    public RedisTemplate redisTemplate() {
        checkData();
        RedisConnectionFactory redisConnectionFactory = lettuceConnectionFactory(genericObjectPoolConfig());
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        // 這裏
        redisTemplate.setValueSerializer(genericJackson2JsonRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        // 這裏
        redisTemplate.setHashValueSerializer(genericJackson2JsonRedisSerializer());
        redisTemplate.setEnableTransactionSupport(true);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }

    @Bean
    @Override
    public CacheManager cacheManager() {

        // 設置序列化
        RedisSerializer<String> stringSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);

        //解決查詢緩存轉換異常的問題
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        // 支持 jdk 1.8 日期
        om.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        om.registerModule(new JavaTimeModule());
        om.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        om.registerModule(new Jdk8Module())
                .registerModule(new JavaTimeModule())
                .registerModule(new ParameterNamesModule());
        jackson2JsonRedisSerializer.setObjectMapper(om);

        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(stringSerializer))
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
                .disableCachingNullValues()
                // 緩存過期時間
                .entryTtl(Duration.ofMinutes(30));

        RedisCacheManager.RedisCacheManagerBuilder builder = RedisCacheManager.RedisCacheManagerBuilder
                .fromConnectionFactory(lettuceConnectionFactory(genericObjectPoolConfig()))
                .cacheDefaults(config)
                .transactionAware();
        @SuppressWarnings("serial")
        Set<String> cacheNames = new HashSet<String>() {
            {
                add("codeNameCache");
            }
        };
        builder.initialCacheNames(cacheNames);
        return builder.build();
    }

解決方案二（單個字段）

@JsonDeserialize(using = LocalDateTimeDeserializer.class)
@JsonSerialize(using = LocalDateTimeSerializer.class)
protected LocalDateTime createTime;