地图列表＆lt;对象＆gt;列表＆lt; objectsrv＆gt;

Question

我想映射列表＆lt;城市＆GT;列表＆lt; Citysrv＆gt;在服务层中，但我不知道该怎么做。

我想映射的City SRV：（SRV =服务器响应值）

@Getter
@Setter
@SuperBuilder
@NoArgsConstructor
@AllArgsConstructor
    public class CitySrv {
        private Long id;
        private String name;
        private Long state;
    }

想要映射的城市实体：

@AllArgsConstructor
@NoArgsConstructor
@Entity
@SuperBuilder
@Getter
@Setter
@Table(name = "IOTP_CITY")
public class City extends BaseEntity {
    @Column(name = "NAME")
    private String name;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "state_id")
    private State state;

    @OneToMany(mappedBy = "city")
    private List<Branch> branches = new ArrayList<Branch>();

}

我以前使用过Model Mapper，但由于某些原因，我无法再使用它。

        @Override
    public GenericResponse<List<CitySrv>> getAllCities() throws ProjectException {
        Optional<List<City>> citiiesSrvResponse = cityRepository.getAllCities();
        if (citiiesSrvResponse.isPresent()) {
            List<CitySrv> citiesList = modelMapper.map(citiiesSrvResponse.get(), new 
                TypeToken<List<CitySrv>>() {
            }.getType());
            return ResponseUtil.getResponse(citiesList);
        } else throw new ProjectException(ExceptionStatus.NOT_FOUND);
    }

Answer 1

我像这样处理它，但不是很好

public GenericResponse<List<CitySrv>> getAllCities() throws ProjectException 
    {
    Optional<List<City>> citiiesSrvResponse = cityRepository.getAllCities();
    CitySrv citySrv = new CitySrv();
    List<CitySrv> citySrvList = new ArrayList<>();
    if (citiiesSrvResponse.isPresent()) {
        for (City eachCity : citiiesSrvResponse.get()) {
            citySrv.setId(eachCity.getId());
            citySrv.setName(eachCity.getName());
            citySrv.setState(eachCity.getState().getId());
            citySrvList.add(citySrv);
        }
        return ResponseUtil.getResponse(citySrvList);
    } else throw new ProjectException(ExceptionStatus.NOT_FOUND);
}

Answer 2

为了使模型设备工作要工作，您的来源和目的地必须足够相似。您想将城市中的实体状态映射到CitySRV的ID。我猜想无法满足这一标准。您必须告诉ModelMapper如何通过配置

TypeMap<City, CitySrv> propertyMapper = modelMapper.createTypeMap(City.class, CitySrv.class);
propertyMapper.addMappings(
    mapper -> mapper.map(src -> src.getState().getId, CitySrv::setState)
);

最佳映射您在全局配置中进行映射。
您可以在此