如何使用mapstruct仅映射选定的字段

<dependency>
    <groupId>org.mapstruct</groupId>
    <artifactId>mapstruct</artifactId>
    <version>1.4.2.Final</version>
</dependency>

public class SourceObject {
    private String field1;
    private int field2;
    // 其他字段及对应的 getter 和 setter
}

public class TargetObject {
    private String field1;
    // 其他字段及对应的 getter 和 setter
}

@Mapper
public interface ObjectMapper {
    @Mappings({
        @Mapping(target = "field1", source = "field1")
    })
    TargetObject mapOnlySelectedFields(SourceObject source);
}

ObjectMapper mapper = Mappers.getMapper(ObjectMapper.class);
TargetObject target = mapper.mapOnlySelectedFields(source);