如何使用 spring 注入，mapstruct 映射器中的存储库类？

Question

@Data
public class FilesDTO {

    private int issue;
    private String uniqueStr;
    private StorageDomain xml;
    private StorageDomain pdf;
    private StorageDomain stop;
}
@Data
public class BackHalfDomain {
    private int articleId;
    private String uniqueStrr;
    private long xmlContentId;
    private long pdfContentId;
    private long stopId;
    private int issueNumber;
}

使用存储库类，我必须从

StorageDomain

中的 ID 获取

BackHalfDomain

对象。所以我必须将

StorageDomain

对象映射到相应的字段。 就像

StorgeDomain sd = repo.findById(id).get();

一样，并在

sd

的 xml 字段中设置这个

FilesDTO

对象，依此类推。 这是我的映射器

@Mapper(componentModel = "spring")
public interface FilesDTOMapper {

    public static final FilesDTOMapper fileDTOMapper = Mappers.getMapper(FilesDTOMapper.class);

    @Mapping(target = "issue", source = "domain.issueNumber")
    @Mapping(target = "DOI", source = "domain.doi")
    public FilesDTO map(BackHalfDomain domain);

}

我已经使用了

uses

但没有成功。 我用过

@Mapping(target="xyz", expression="java(repo.findById(id))")"

但我得到的只是

NullPointerException

弹簧注入不起作用。 有人可以解决这个问题吗？我刚刚开始

mapstruct

Answer 1

从mapstruct 1.2开始你可以使用@AfterMapping和@Context的组合。

@Mapper(componentModel="spring")
public interface FilesDTOMapper { 

   @Mapping(target = "xyz", ignore = true)
   @Mapping(target = "issue", source = "domain.issueNumber")
   @Mapping(target = "DOI", source = "domain.doi")
   FilesDTO map( BackHalfDomain domain, @Context MyRepo repo);

   @AfterMapping
   default void map( @MappingTarget FilesDTO target, BackHalfDomain domain, @Context MyRepo repo) {
        target.setXYZ(repo.findById(domain.getId()));
   }
 }

在 1.1 中，您需要将映射器转换为抽象类

@Mapper(unmappedTargetPolicy = org.mapstruct.ReportingPolicy.IGNORE,
        componentModel = "spring",
        uses = {})
public abstract class FilesDTOMapper {

    @Autowired
    protected MyRepo repo;


    @Mapping(target = "issue", source = "domain.issueNumber")
    @Mapping(target = "DOI", source = "domain.doi")
    @Mapping(target="xyz", expression="java(repo.findById(domain.getId())))")
    public FilesDTO map(BackHalfDomain domain);

}

Answer 2

我遇到了同样的问题。解决方案是按照这个答案中的建议使用装饰器。按照您的代码，解决方案将类似于以下内容。

首先，我们必须在Mapper中指定Decorator：

@Mapper(componentModel = "spring", unmappedTargetPolicy = ReportingPolicy.IGNORE)
@Primary
@DecoratedWith(FilesDTOMapperDecorator.class)
public interface FilesDTOMapper {
      // basic mapping here
      public FilesDTO map(BackHalfDomain domain);
}

然后，实现装饰器：

public abstract class FilesDTOMapperDecorator implements FilesDTOMapper {

    @Autowired
    @Qualifier("delegate")
    private FilesDTOMapper delegate;

    @Autowired
    private SomeRepository someRepository;

    @Override
    public FilesDTO map(BackHalfDomain domain) {
        // Delegate basic mapping
        FilesDTO filesDTO = delegate.map(domain);

        // Use the repository as needed to set additional mapping
        filesDTO.setSomeValue(repo.findById(id).getSomeValue());

        return filesDTO;
    }
}

Answer 3

您需要像 bean 一样将映射器注入到服务中。