使用 Jackson JSR310 模块反序列化 LocalDateTime [英] Deserializing LocalDateTime with Jackson JSR310 module

问题描述

我正在使用 Jackson Datatype JSR310 页面 中描述的库，但我仍然难以让它工作.

I'm using the library described the Jackson Datatype JSR310 page but I'm still having difficulty getting it to work.

我已经配置了以下 bean:

I have configured the following bean:

@Bean
@Primary
public ObjectMapper objectMapper() {
    ObjectMapper mapper = new ObjectMapper();
    mapper.registerModule(new JSR310Module());
    return mapper;
}

当我调用 REST API 时，日期格式输出为 yyyy-MM-dd'T'HH:ss.SSSSSS，例如2015-04-11T00:10:38.905847.这由我的 AngularJS 代码处理得很好.

When I call my REST API the date format output is yyyy-MM-dd'T'HH:ss.SSSSSS, e.g. 2015-04-11T00:10:38.905847. This gets handled by my AngularJS code just fine.

当我想向 REST API 提交某些内容时，日期发布为 yyyy-MM-dd'T'HH:mm:ss.SSS'Z'，例如2015-04-09T08:30:00.000Z

When I want to submit something to the REST API the date is posted as yyyy-MM-dd'T'HH:mm:ss.SSS'Z', e.g. 2015-04-09T08:30:00.000Z

Jackson 一直在抱怨结尾的Z".如果我查看文档中的 LocalDateTimeDeserializer，它使用了 DateTimeFormatter.ISO_LOCAL_DATE_TIME ，它归结为 ISO_LOCAL_DATE'T'ISO_LOCAL_TIME 并且它提到它没有覆盖区域.

Jackson keeps complaining about the 'Z' at the end. If I look at the LocalDateTimeDeserializer in the documentation it uses the DateTimeFormatter.ISO_LOCAL_DATE_TIME which boils to ISO_LOCAL_DATE'T'ISO_LOCAL_TIME and it mentions it has no override zone.

所以我想我应该在我创建的 ObjectMapper 上设置 DateFormat:

So I figured I should set the DateFormat on the ObjectMapper I'm creating:

@Bean
@Primary
public ObjectMapper objectMapper() {
    ObjectMapper mapper = new ObjectMapper();
    mapper.registerModule(new JSR310Module());
    mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"));
    return mapper;
}

但这没有任何作用.我将其更改为诸如 yyyy-MM-dd 之类的简单内容，但序列化日期仍保留以前的格式，反序列化也不受影响.

But this does nothing. I changed it to something simple like yyyy-MM-dd but the serialized date remained in the previous format and the deserialization isn't affected either.

我在这里做错了什么才能让它发挥作用?据我所知，我的 JavaScript 代码中的日期格式是 ISO 8601 格式...

What am I doing wrong here to get this to work? The date format in my JavaScript code is, as far as I know the ISO 8601 format...

推荐答案

没有必要编写自己的序列化程序.使用默认的就足够了，但是用另一种格式(time_zone 格式)制作一个实例，这样超出的部分就被剪掉了:

It's not necessary to write your own serializer. It's enough use the default one, but making an instance with another format (the time_zone one) so that the exceeding part is just cut:

new LocalDateTimeDeserializer(DateTimeFormatter.ISO_DATE_TIME)

就我而言，我有一个这样的 contextResolver 可以在配置级别实现:

In my case I've got a contextResolver like this to achieve at configuration level:

@Service 
@Provider
public class ObjectMapperContextResolver implements ContextResolver<ObjectMapper> {  
    private final ObjectMapper mapper;

    public ObjectMapperContextResolver() {
        mapper = new ObjectMapper();
        JavaTimeModule javaTimeModule=new JavaTimeModule();
        // Hack time module to allow 'Z' at the end of string (i.e. javascript json's) 
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ISO_DATE_TIME));
        mapper.registerModule(javaTimeModule);
        mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
        return mapper;
    }  
}

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