java - 使用 ModelMapper 将 DTO 映射到实体(包括异常)

Question

我有一个 DTO (OpeningHoursPeriodDTO) 和一个实体 (OpeningHoursPeriod)，我想使用 ModelMapper 进行映射。只要我在转换器方法中不抛出任何异常，一切都会按预期正常工作。

这里是转换器的代码:

modelMapper
        .createTypeMap(OpeningHoursPeriodDTO.class, OpeningHoursPeriod.class)
        .setConverter(converter -> {
            OpeningHoursPeriodDTO openingHoursPeriodDTO = converter.getSource();
            if (openingHoursPeriodDTO == null) {
                return null;
            }

            if (openingHoursPeriodDTO.getOpen() == null || openingHoursPeriodDTO.getClose() == null) {
                throw new BadRequestException("Opening hours and closing hours must be present");
            }

            if (!Objects.equals(
                    openingHoursPeriodDTO.getOpen().getDay(),
                    openingHoursPeriodDTO.getClose().getDay())) {
                throw new BadRequestException("Opening and close day for a period must be for the same day");
            }

            return OpeningHoursPeriod.builder()
                    .id(openingHoursPeriodDTO.getId())
                    .day(openingHoursPeriodDTO.getOpen().getDay())
                    .openTime(LocalTime.parse(openingHoursPeriodDTO.getOpen().getTime(), TIME_FORMATTER))
                    .closeTime(LocalTime.parse(openingHoursPeriodDTO.getClose().getTime(), TIME_FORMATTER))
                    .build();
        });

问题是，如果它碰巧抛出异常，我会在 Spring Boot 应用程序中收到 500 状态代码，尽管 BadRequestException 的状态代码应该是 400。知道如何最好地处理此类转换器异常吗？

Answer 1

您可以将 @ResponseStatus 添加到您的异常中:

@ResponseStatus(value = HttpStatus.BAD_REQUEST)
public class BadRequestException extends RuntimeException {
}

抛出此异常时将生成 400。

但是还有各种其他选项可以处理 REST Controller 中的异常。看看这里:

https://www.baeldung.com/exception-handling-for-rest-with-spring