关于MapStruct的使用教程

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

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
                <annotationProcessorPaths>
                    <path>
                        <groupId>org.mapstruct</groupId>
                        <artifactId>mapstruct-processor</artifactId>
                        <version>1.4.2.Final</version>
                    </path>
                </annotationProcessorPaths>
            </configuration>
        </plugin>
    </plugins>
</build>

dependencies {
    implementation 'org.mapstruct:mapstruct:1.4.2.Final'
    annotationProcessor 'org.mapstruct:mapstruct-processor:1.4.2.Final'
}

import org.mapstruct.Mapper;
import org.mapstruct.factory.Mappers;

@Mapper
public interface MyMapper {
    MyMapper INSTANCE = Mappers.getMapper(MyMapper.class);

    // 定义从源对象到目标对象的映射方法
    TargetObject map(SourceObject source);
}

public class MyService {
    public TargetObject convert(SourceObject source) {
        return MyMapper.INSTANCE.map(source);
    }
}

@Mapper
public interface MyMapper {
    @Mapping(target = "targetProperty", source = "sourceProperty")
    @Mapping(target = "targetProperty2", expression = "java(String.valueOf(source.getSourceProperty2()))")
    TargetObject map(SourceObject source);
}

@Mapper
public interface MyMapper {
    @Mapping(target = "dateOfBirth", source = "birthYear", qualifiedByName = "yearToCalendar")
    TargetObject map(SourceObject source);

    @Named("yearToCalendar")
    default Date yearToCalendar(int year) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(year, Calendar.JANUARY, 1);
        return calendar.getTime();
    }
}

@Mapper(componentModel = "spring")
public interface MyMapper {
    TargetObject map(SourceObject source);
}