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java - 如何使用 spring 注入，mapstruct 映射器中的存储库类？

问题描述

@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StorageDomain从BackHalfDomain. 所以我必须StorageDomain用各自的字段映射对象。喜欢StorgeDomain sd = repo.findById(id).get();并将此sd对象设置在FilesDTO的 xml 字段中，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);

}

我用过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 Spring injection 不起作用。有人可以解决这个问题吗？我刚开始mapstruct

标签： javaspringmappingmapstructmapper

解决方案

从 mapstruct 1.2 开始，您可以使用 @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);

}

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