Java工具-mapstruct

引入类库

类库

<mapstruct.version>1.5.3.Final</mapstruct.version>

<!-- use mapstruct-jdk8 for Java 8 or higher -->
<dependency>
	<groupId>org.mapstruct</groupId>
	<artifactId>mapstruct</artifactId>
	<version>${mapstruct.version}</version>
</dependency>
<dependency>
	<groupId>org.mapstruct</groupId>
	<artifactId>mapstruct-jdk8</artifactId>
	<version>${mapstruct.version}</version>
</dependency>
<dependency>
	<groupId>org.mapstruct</groupId>
	<artifactId>mapstruct-processor</artifactId>
	<version>${mapstruct.version}</version>
</dependency>

插件

<plugin>
	<groupId>org.apache.maven.plugins</groupId>
	<artifactId>maven-compiler-plugin</artifactId>
	<version>${maven-compiler-plugin.version}</version>
	<configuration>
		<annotationProcessorPaths>
			<path>
				<groupId>org.mapstruct</groupId>
				<artifactId>mapstruct-processor</artifactId>
				<version>${mapstruct.version}</version>
			</path>
		</annotationProcessorPaths>
	</configuration>
</plugin>

编写接口

@Mapper
public interface ItemConvert {

    /**可以直接调用该INSTANCE对应的方法实现转换*/
    ItemConvert INSTANCE = Mappers.getMapper(ItemConvert.class);
    /**接口方法，mapstruct会自动通过编译代码修改实现*/
    SkuDTO2 domain2Dto(Sku2 sku2);

    /**自定义转换方法*/
    default Item2 item1ToItem2(Item1 item1) {
        if (item1 == null) {
            return null;
        }

        Item2 item2 = new Item2();

        item2.setItemId(11111L);
        item2.setTitle(item1.getTitle());

        return item2;
    }
}

//mapstruct生成的实现类
@Generated(
    value = "org.mapstruct.ap.MappingProcessor",
    date = "2019-07-30T18:38:11+0800",
    comments = "version: 1.3.0.Final, compiler: javac, environment: Java 1.8.0_101 (Oracle Corporation)"
)
public class ItemConvertImpl implements ItemConvert {

    @Override
    public SkuDTO2 domain2Dto(Sku2 sku2) {
        if ( sku2 == null ) {
            return null;
        }

        SkuDTO2 skuDTO2 = new SkuDTO2();

        skuDTO2.setSkuId( sku2.getSkuId() );
        skuDTO2.setSkuCode( sku2.getSkuCode() );
        if ( sku2.getSkuPrice() != null ) {
            skuDTO2.setSkuPrice( Long.parseLong( sku2.getSkuPrice() ) );
        }
        List<String> list = sku2.getNameList();
        if ( list != null ) {
            skuDTO2.setNameList( new ArrayList<String>( list ) );
        }
        // mapstruct直接调用的是在接口中自定义的实现
        skuDTO2.setItem( item1ToItem2( sku2.getItem() ) );

        return skuDTO2;
    }
}