MapStruct - 简单Java Bean映射

GitHub

https://github.com/mapstruct/mapstruct

简介

使用MapStruct

Maven

For Maven-based projects, add the following to your POM file in order to use MapStruct (the dependencies are available at Maven Central):

对于基于Maven的项目，请将以下内容添加到POM文件中，以便使用MapStruct（依赖项在Maven Central上提供）：

...
<properties>
    <org.mapstruct.version>1.3.1.Final</org.mapstruct.version>
</properties>
...
<dependency>
    <groupId>org.mapstruct</groupId>
    <artifactId>mapstruct</artifactId>
    <version>${org.mapstruct.version}</version>
    <scope>compile</scope>
</dependency>
<dependency>
    <groupId>org.mapstruct</groupId>
    <artifactId>mapstruct-processor</artifactId>
    <version>${org.mapstruct.version}</version>
    <scope>compile</scope>
</dependency>
...

IDE 插件

建议安装MapStruct插件

IDE	插件名称
IntelliJ IDEA	MapStruct Support

示例

准备以下两组实体类

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Car {
    private String make;
    private int numberOfSeats;
    private CarType type;
}

import lombok.Data;

@Data
public class CarDto {
    private String make;
    private int seatCount;
    private String type;
}

public enum CarType {
    SEDAN;
}

映射接口

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

@Mapper
public interface CarMapper {

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

    @Mapping(source = "numberOfSeats", target = "seatCount")
    CarDto carToCarDto(Car car);
}

单元测试类

import org.junit.jupiter.api.Test;

import static org.assertj.core.api.Assertions.assertThat;

public class CarMapperTests {
    @Test
    public void shouldMapCarToDto() {
        //given
        Car car = new Car( "Morris", 5, CarType.SEDAN );

        //when
        CarDto carDto = CarMapper.INSTANCE.carToCarDto( car );

        //then
        assertThat( carDto ).isNotNull();
        assertThat( carDto.getMake() ).isEqualTo( "Morris" );
        assertThat( carDto.getSeatCount() ).isEqualTo( 5 );
        assertThat( carDto.getType() ).isEqualTo( "SEDAN" );
    }
}