SpringBoot-MVC RequestBody中LocalDateTime的自适应配置

请求的json报文中可能会出现一下几种：

['2019-01-01','2019-01-01 12:03:34','20190101120334']

但是接收的Request实体类日期字段是LocalDateTime类型

LocalDateTime applyDate;

希望的情况是：

输入 yyyy-MM-dd HH:mm:ss 、yyyyMMddHHmmss等精确到秒的格式，可以自动被封装LocalDateTime；
输入 yyyy-MM-dd 、yyyyMMdd等精确到日的格式，也可以被封装成LocalDateTime, HHmmss默认为000000；

默认情况下，是没办法自动转换的，需要在 ObjectMapper中配置，网上主流的配置如下

@Configuration
@Slf4j
public class MvcConfig implements WebMvcConfigurer {

    /**
     * 更改jackson默认配置
     * @return
     */
    @Bean
    @Primary
    public ObjectMapper objectMapper(Jackson2ObjectMapperBuilder builder){
        //日期和时间格式化
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyyMMddHHmmss")));
        javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern("HH:mm:ss")));

        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyyMMddHHmmss")));
        javaTimeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        javaTimeModule.addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
        javaTimeModule.addDeserializer(LocalDateTime.class,new MyLocalDateTimeDeserializer());
        objectMapper.registerModule(javaTimeModule);
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        return objectMapper;
    }
}

但实际效果是，上面第二种情况没法生效。百度了很多也都是重复内容，无效。google得一答案：

@Configuration
@Slf4j
public class MvcConfig implements WebMvcConfigurer {

    /**
     * 更改jackson默认配置
     * @return
     */
    @Bean
    @Primary
    public ObjectMapper objectMapper(Jackson2ObjectMapperBuilder builder){
        ObjectMapper objectMapper = builder.json().build();

        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addDeserializer(LocalDateTime.class,new MyLocalDateTimeDeserializer());
        objectMapper.registerModule(simpleModule);

        //忽视请求报文中未匹配到的字段（多余的字段）
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        return objectMapper;
    }
}

需要自定义反序列化类

MyLocalDateTimeDeserializer

public class MyLocalDateTimeDeserializer  extends JsonDeserializer<LocalDateTime> {


    @Override
    public LocalDateTime deserialize(JsonParser parser, DeserializationContext context) throws IOException {
        String dateStr = parser.getText();
        DateTime dateTime = null;
        try{
            dateTime = DateUtil.parse(dateStr);
        }catch (Exception e){
            dateTime = DateUtil.parseDateTime(dateStr.replaceAll("T"," "));
        }
        Date date = dateTime.toJdkDate();
        Instant instant = date.toInstant();
        ZoneId zoneId = ZoneId.systemDefault();
        LocalDateTime localDateTime = instant.atZone(zoneId).toLocalDateTime();
        return localDateTime;
    }

    @Override
    public Class<?> handledType() {
        return LocalDateTime.class;
    }
}

deserialize方法的逻辑就靠自己实现了，我这边是借助了hutool工具类进行了简化。

没啥技术含量，就是一个坑，希望有帮助。

来源：https://my.oschina.net/eqshen/blog/3106716

标签

ObjectMapper

Spring

Hutool

Spring Boot