Mapstruct LocalDateTime到即时 [英] Mapstruct LocalDateTime to Instant

问题描述

我是Mapstruct的新手。我有一个包含 LocalDateTime 类型字段的模型对象。 DTO包含 Instant 类型字段。我想将 LocalDateTime 类型字段映射到 Instant 类型字段。我有 TimeZone 传入请求的实例。

I am new in Mapstruct. I have a model object which includes LocalDateTime type field. DTO includes Instant type field. I want to map LocalDateTime type field to Instant type field. I have TimeZone instance of incoming requests.

像这样手动设置字段；

Manually field setting like that;

set( LocalDateTime.ofInstant(x.getStartDate(), timeZone.toZoneId()) )

如何使用Mapstruct映射这些字段？

How can I map these fields using with Mapstruct?

推荐答案

您有2种选择来实现

第一个选项：

使用新的 @Context < timeZone 属性的1.2.0.Final版本中的/ code>批注，并定义您自己的执行映射的方法。

Use the new @Context annotation from 1.2.0.Final for the timeZone property and define your own method that would perform the mapping. Something like:

public interface MyMapper {

    @Mapping(target = "start", source = "startDate")
    Target map(Source source, @Context TimeZone timeZone);

    default LocalDateTime fromInstant(Instant instant, @Context TimeZone timeZone) {
        return instant == null ? null : LocalDateTime.ofInstant(instant, timeZone.toZoneId());
    }
}

然后，MapStruct将使用提供的方法在即时和 LocalDateTime 。

MapStruct will then use the provided method to perform mapping between Instant and LocalDateTime.

第二个选项：

public interface MyMapper {

    @Mapping(target = "start", expression = "java(LocalDateTime.ofInstant(source.getStartDate(), timezone.toZoneId()))")
    Target map(Source source, TimeZone timeZone);
}

我个人的选择是使用第一个

My personal option would be to use the first one

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