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javas实体映射之mapstrcut

admin 11月 14, 2020 0

mapstrcut简介

MapStruct是一个用于生成类型安全的bean映射类的Java注解处理器。
使用时只需要定义映射器接口，声明需要映射的方法。它就会在编译过程中，生成该接口的实现，
对源对象和目标对象进行映射。

maven导入

<dependency>
    <groupId>org.mapstruct</groupId>
    <artifactId>mapstruct-jdk8</artifactId>
    <version>${org.mapstruct.version}</version>
</dependency>
<dependency>
    <groupId>org.mapstruct</groupId>
    <artifactId>mapstruct-processor</artifactId>
    <version>${org.mapstruct.version}</version>
</dependency>

使用示例

推荐参考 mapStruct官方文档。

同名属性映射

@Mapper
public interface UserBeanMapper {

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

    UserVO doToVO(UserDO userDO);
    
    public static void main(String[] args) {
        // 即可实现do到vo同名属性的映射
        UserVO userVO = UserBeanMapper.INSTANCE.doToVO(userDO);
    }
}

非同名属性映射

@Mapper
public interface FishTankMapperWithDocument {

    @Mappings({
        @Mapping(target = "fish.kind", source = "fish.type"),
        @Mapping(target = "fish.name", expression = "java("Jaws")"),
        @Mapping(target = "plant", ignore = true ),
        @Mapping(target = "ornament", ignore = true ),
        @Mapping(target = "material", ignore = true),
        @Mapping(target = "quality.document", source = "quality.report"),
        @Mapping(target = "quality.document.organisation.name", constant = "NoIdeaInc" )
    })
    FishTankWithNestedDocumentDto map( FishTank source );
}