如何在MapStruct的表达式中添加空格

Question

我需要将源中的firstName和lastName添加到目标中的fullName。我先要

我的源和目标类-

public class Source {
    private int id;
    private String firstName;
    private String lastName;
    private List<String> addressList;
}

public class Target {
    private int id;
    private String fullName;
    private String city;
}

这是我的映射器接口-

@Mapper
public interface SourceTargetMapper {

    SourceTargetMapper INSTANCE = Mappers.getMapper(SourceTargetMapper.class);

    @Mapping(expression = "java(source.getFirstName()+source.getLastName())", target = "fullName")
    @Mapping(expression = "java(source.getAddressList().get(0))", target = "city")
    Target sourceToTarget(Source source);

    @InheritInverseConfiguration
    Source targetToSource(Target target);
}

在中间加空格会给我带来错误-

@Mapping(expression = "java(source.getFirstName()+" "+source.getLastName())", target = "fullName")

是否有任何其他解决方案或方法？

Answer 1

我发现了另一种通过使用装饰器模式来编写映射的方法，正如在地图结构留档中提到的那样。

我将在这里复制粘贴链接和示例。

https://mapstruct.org/documentation/dev/reference/html/#customizing-使用装饰器的映射器

下面是取自mapstruct文档的代码-

@Mapper
@DecoratedWith(PersonMapperDecorator.class)
public interface PersonMapper {

    PersonMapper INSTANCE = Mappers.getMapper( PersonMapper.class );

    PersonDto personToPersonDto(Person person);

    AddressDto addressToAddressDto(Address address);
}


public abstract class PersonMapperDecorator implements PersonMapper {

    private final PersonMapper delegate;

    public PersonMapperDecorator(PersonMapper delegate) {
        this.delegate = delegate;
    }

    @Override
    public PersonDto personToPersonDto(Person person) {
        PersonDto dto = delegate.personToPersonDto( person );
        dto.setFullName( person.getFirstName() + " " + person.getLastName() );
        return dto;
    }
}

Answer 2

您将需要转义引用"。

例如

@Mapping(expression = "java(source.getFirstName()+ \" \" +source.getLastName())", target = "fullName")