在实际的项目开发中会大量的使用POJO作为数据载体,通常有如下的:
实体名 | 实体含义 | 说明 |
---|---|---|
DO | Data Object | 与数据库表结构一一对应,通过DAO层向上传输数据源对象 |
DTO | Data Transfer Object | 数据传输对象,Service或Manager向外传输的对象 |
BO | Business Object | 业务对象,由Service层输出的封装业务逻辑的对象 |
VO | View Object | 显示层对象,通常是 Web 向模板渲染引擎层传输的对象 |
只需要在pom.xml文件中加入以下依赖即可:
...
<properties>
<java.version>1.8java.version>
<mapstruct.version>1.3.1.Finalmapstruct.version>
properties>
...
<dependencies>
<dependency>
<groupId>org.mapstructgroupId>
<artifactId>mapstructartifactId>
<version>${mapstruct.version}version>
dependency>
dependencies>
...
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.pluginsgroupId>
<artifactId>maven-compiler-pluginartifactId>
<version>3.8.1version>
<configuration>
<source>${java.version}source>
<target>${java.version}target>
<annotationProcessorPaths>
<path>
<groupId>org.mapstructgroupId>
<artifactId>mapstruct-processorartifactId>
<version>${mapstruct.version}version>
path>
annotationProcessorPaths>
configuration>
plugin>
plugins>
build>
...
package com.linfanchen.springboot.lab.mapstruct.domain;
public class CarDO {
/**
* 主键ID
*/
private Integer id;
/**
* 名称
*/
private String name;
/**
* 品牌
*/
private String brand;
/**
* 车价
*/
private Integer price;
/**
* 轮胎属性
*/
private TyreDO tyreDO;
/**
* 汽车图片
*/
private String images;
public String getImages() {
return images;
}
public void setImages(String images) {
this.images = images;
}
public TyreDO getTyreDO() {
return tyreDO;
}
public void setTyreDO(TyreDO tyreDO) {
this.tyreDO = tyreDO;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getBrand() {
return brand;
}
public void setBrand(String brand) {
this.brand = brand;
}
public Integer getPrice() {
return price;
}
public void setPrice(Integer price) {
this.price = price;
}
}
package com.linfanchen.springboot.lab.mapstruct.domain;
/**
* 轮胎
*/
public class TyreDO {
/**
* 主键ID
*/
private Integer id;
/**
* 轮胎名称
*/
private String name;
/**
* 轮胎尺寸
*/
private Integer size;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getSize() {
return size;
}
public void setSize(Integer size) {
this.size = size;
}
}
package com.linfanchen.springboot.lab.mapstruct.bo;
import com.linfanchen.springboot.lab.mapstruct.domain.TyreDO;
import java.util.List;
/**
* 汽车业务对象
*/
public class CarBO {
/**
* 主键ID
*/
private Integer id;
/**
* 名称
*/
private String name;
/**
* 品牌
*/
private String brand;
/**
* 车价
*/
private Integer price;
/**
* 轮胎属性
*/
private TyreDO tyreDO;
/**
* 汽车图片
*/
private String images;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getBrand() {
return brand;
}
public void setBrand(String brand) {
this.brand = brand;
}
public Integer getPrice() {
return price;
}
public void setPrice(Integer price) {
this.price = price;
}
public TyreDO getTyreDO() {
return tyreDO;
}
public void setTyreDO(TyreDO tyreDO) {
this.tyreDO = tyreDO;
}
public String getImages() {
return images;
}
public void setImages(String images) {
this.images = images;
}
}
package com.linfanchen.springboot.lab.mapstruct.bo;
import com.linfanchen.springboot.lab.mapstruct.domain.TyreDO;
import java.util.List;
/**
* 汽车业务对象
*/
public class CarDetailBO {
/**
* 主键ID
*/
private Integer carId;
/**
* 名称
*/
private String carName;
/**
* 品牌
*/
private String carBrand;
/**
* 车价
*/
private Integer price;
/**
* 轮胎属性
*/
private TyreDO tyreDetail;
/**
* 汽车图片
*/
private List<String> images;
public Integer getCarId() {
return carId;
}
public void setCarId(Integer carId) {
this.carId = carId;
}
public String getCarName() {
return carName;
}
public void setCarName(String carName) {
this.carName = carName;
}
public String getCarBrand() {
return carBrand;
}
public void setCarBrand(String carBrand) {
this.carBrand = carBrand;
}
public Integer getPrice() {
return price;
}
public void setPrice(Integer price) {
this.price = price;
}
public TyreDO getTyreDetail() {
return tyreDetail;
}
public void setTyreDetail(TyreDO tyreDetail) {
this.tyreDetail = tyreDetail;
}
public List<String> getImages() {
return images;
}
public void setImages(List<String> images) {
this.images = images;
}
}
说明:
package com.linfanchen.springboot.lab.mapstruct.convert;
import com.linfanchen.springboot.lab.mapstruct.bo.CarBO;
import com.linfanchen.springboot.lab.mapstruct.bo.CarDetailBO;
import com.linfanchen.springboot.lab.mapstruct.domain.CarDO;
import org.apache.commons.lang3.StringUtils;
import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.Mappings;
import org.mapstruct.Named;
import org.mapstruct.factory.Mappers;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* 转换类
*/
@Mapper
public interface CarConvert {
CarConvert INSTANCE = Mappers.getMapper(CarConvert.class);
/**
* 来源和目标类的直接转换
*/
CarBO convert(CarDO carDO);
/**
* 添加字段处理和映射关系后的转换
*/
@Mappings({
@Mapping(source = "id", target = "carId"),
@Mapping(source = "name", target = "carName"),
@Mapping(source = "brand", target = "carBrand"),
@Mapping(source = "tyreDO.id", target = "tyreDetail.id"),
@Mapping(source = "tyreDO.name", target = "tyreDetail.name"),
@Mapping(source = "tyreDO.size", target = "tyreDetail.size"),
@Mapping(source = "images", target = "images", qualifiedByName = "convertImagesStrToList")
})
CarDetailBO convertDetail(CarDO carDO);
@Named("convertImagesStrToList")
default List<String> convertImagesStrToList(String images) {
String[] splitArr = org.springframework.util.StringUtils.split(images, ",");
return new ArrayList<>(Arrays.asList(splitArr));
}
}
package com.linfanchen.springboot.lab.mapstruct;
import com.linfanchen.springboot.lab.mapstruct.bo.CarBO;
import com.linfanchen.springboot.lab.mapstruct.bo.CarDetailBO;
import com.linfanchen.springboot.lab.mapstruct.convert.CarConvert;
import com.linfanchen.springboot.lab.mapstruct.domain.CarDO;
import com.linfanchen.springboot.lab.mapstruct.domain.TyreDO;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
@RunWith(SpringRunner.class)
@SpringBootTest
public class CarTest {
@Test
public void test() {
// 创建轮胎对象
TyreDO tyreDO = new TyreDO();
tyreDO.setId(888);
tyreDO.setName("米其林245/45R19");
tyreDO.setSize(19);
// 汽车图片地址,通过半角逗号分隔的http地址
List<String> imageList = new ArrayList<>();
imageList.add("https://www.bmw.com.cn/image.1601043751651.jpg");
imageList.add("https://www.bmw.com.cn/image.1623295725814.jpg");
imageList.add("https://www.bmw.com.cn/image.1611042489480.jpg");
String imageStr = imageList.stream().map(String::valueOf).collect(Collectors.joining(","));
// 创建汽车对象
CarDO carDO = new CarDO();
carDO.setId(123);
carDO.setBrand("BMW");
carDO.setName("宝马530Li行政版");
carDO.setPrice(540000);
carDO.setTyreDO(tyreDO);
carDO.setImages(imageStr);
// 直接的数据拷贝
CarBO carBO = CarConvert.INSTANCE.convert(carDO);
System.out.println(carBO.getImages());
System.out.println(carBO.getBrand());
System.out.println(carBO.getName());
System.out.println(carBO.getTyreDO());
// 带数据转换的拷贝
CarDetailBO carDetailBO = CarConvert.INSTANCE.convertDetail(carDO);
System.out.println(carDetailBO.getImages());
System.out.println(carDetailBO.getTyreDetail().getName());
}
}
在需要进行对象的转换的时候,我们可以使用MapStruct进行各种灵活的转换,最终得到我们想要的数据。
参考文档: