使用 MapStruct 将 2 个字符串字段映射到 OffsetDateTime

Question

我有以下 DTO，其中有 2 个字段必须转换为 OffsetDateTime：

@Data
public class AppointmentDTO {

    private String id;

    @NotNull
    private String startTime;

    @NotNull
    private String endTime;

    @NotNull
    private String timeZoneStart;

    @NotNull
    private String timeZoneEnd;

    // other fields
}

至

@Data
@Document
@NoArgsConstructor
@AllArgsConstructor
public class Appointment {

    @Id
    private String id;

    private String timeZoneStart;
    private String timeZoneEnd;
    private OffsetDateTime startTime;
    private OffsetDateTime endTime;
    private OffsetDateTime createdTime;
    // other fields
}

为了转换，我需要 DTO 的 timeZone 字段加上一个 DateTimeFormatter。所以，我的尝试是这样的：

@Component
@Mapper(componentModel = "spring")
public interface IAppointmentMapper {

    @Mapping(target = "createdTime", ignore = true)
    Appointment convertAppointmentDTOToAppointment(AppointmentDTO dto, @Context OffsetDateTimeMapper offsetDateTimeMapper);
}

public class OffsetDateTimeMapper {

    private String startTime;
    private String endTime;
    private String timeZoneStart;
    private String timeZoneEnd;
    private final DateTimeFormatter dateTimeFormatter;

    public OffsetDateTimeMapper(DateTimeFormatter dateTimeFormatter) {
        this.dateTimeFormatter = dateTimeFormatter;
    }

    @BeforeMapping
    public void beforeStartTimeMapping(AppointmentDTO dto) {
        this.startTime = dto.getStartTime();
        this.timeZoneStart = dto.getTimeZoneStart();
    }

    @BeforeMapping
    public void beforeEndTimeMapping(AppointmentDTO dto) {
        this.endTime = dto.getEndTime();
        this.timeZoneEnd = dto.getTimeZoneEnd();
    }

    @AfterMapping
    public void startTimeMap(@MappingTarget Appointment appointment) {
        LocalDateTime localDateTime = LocalDateTime.parse(startTime, dateTimeFormatter);
        ZonedDateTime zonedDateTime = localDateTime.atZone(ZoneId.of(timeZoneStart));
        appointment.setStartTime(zonedDateTime.toOffsetDateTime());
    }

    @AfterMapping
    public void endTimeMap(@MappingTarget Appointment appointment) {
        LocalDateTime localDateTime = LocalDateTime.parse(endTime, dateTimeFormatter);
        ZonedDateTime zonedDateTime = localDateTime.atZone(ZoneId.of(timeZoneEnd));
        appointment.setEndTime(zonedDateTime.toOffsetDateTime());
    }
}

但是，当我构建时，出现以下错误：Error:(22,17) java: Can't map property "java.lang.String startTime" to "java.time.OffsetDateTime startTime". Consider to declare/implement a mapping method: "java.time.OffsetDateTime map(java.lang.String value)". 如果我在界面上放置一个 default map() 方法，我不会收到错误，但我没有需要正确的 @Context。

/*default OffsetDateTime map(String value) {
     LocalDateTime localDateTime = LocalDateTime.parse(value);
     ZonedDateTime zonedDateTime = localDateTime.atZone(ZoneOffset.UTC);
     return zonedDateTime.toOffsetDateTime();
}*/

Answer 1

你的方法很有趣。为了正常工作，您必须明确忽略不希望 MapStruct 自动映射的属性。

在这种情况下添加：

@Mapping(target = "startTime", ignore = true)
@Mapping(target = "endTime", ignore = true)

但是，在您的情况下，我会尝试使用 Mapping method selection based on qualifiers 并将源参数用作源。

所以像这样：

@Component
@Mapper(componentModel = "spring")
public interface IAppointmentMapper {

    @Mapping(target = "createdTime", ignore = true)
    @Mapping(target = "startTime", source = "dto", qualifiedByName = "startTime")
    @Mapping(target = "endTime", source = "dto", qualifiedByName = "endTime")
    Appointment convertAppointmentDTOToAppointment(AppointmentDTO dto, @Context DateTimeFormatter dateTimeFormatter);

    @Named("startTime")
    default OffsetDateTime mapStartTime(AppointmentDTO dto, @Context DateTimeFormatter dateTimeFormatter) {

        LocalDateTime localDateTime = LocalDateTime.parse(dto.getStartTime(), dateTimeFormatter); 
        ZonedDateTime zonedDateTime = localDateTime.atZone(ZoneId.of(dto. getTimeZoneStart()));
        return zonedDateTime.toOffsetDateTime()
    }

    @Named("endTime")
    default OffsetDateTime mapEndTime(AppointmentDTO dto, @Context DateTimeFormatter dateTimeFormatter) {

        LocalDateTime localDateTime = LocalDateTime.parse(dto.getEndTime(), dateTimeFormatter); 
        ZonedDateTime zonedDateTime = localDateTime.atZone(ZoneId.of(dto. getTimeZoneEnd()));
        return zonedDateTime.toOffsetDateTime()
    }
}

注意：@Named 是 org.mapstruct.Named。

使用 MapStruct 将 2 个字符串字段映射到 OffsetDateTime

Mapping 2 String fields to OffsetDateTime with MapStruct

java

spring

mapstruct