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2022-12-16
SpringBoot2.x集成Dozer的示例代码
目录一、引入依赖二、实体类三、编写配置文件四、创建测试类五、Dozer的基本使用代码示例
Dozer是java Bean到Java Bean的映射器,它以递归的方式将数据从一个对象复制到另一个对象。通常,这些Java Bean将具有不同的复杂类型。它支持简单属性映射,复杂类型映射,双向映射,隐式显式映射,以及递归映射。这包括映射需要在元素层面上进行映射的集合属性。可以将Dozer用作两个对象之间属性转换的工具,使用它可以很方便地对项目中的DO、DTO、VO进行相互转换。
本文主要对SpringBoot2.x集成Dozer及其基本使用进行简单总结,其中SpringBoot使用的2.4.5版本。
一、引入依赖
二、实体类
User类:
package com.rtxtitanv.model;
import lombok.Data;
import lombok.experimental.Accessors;
import java.util.Date;
/**
* @author rtxtitanv
* @version 1.0.0
* @name com.rtxtitanv.model.User
* @description User
* @date 2021/8/18 16:45
*/
@Accessors(chain = true)
@Data
public class User {
private Long id;
private String name;
private Integer age;
private String gender;
private String email;
private Date birthday;
}
UserDTO类:
package com.rtxtitanv.model;
import lombok.Data;
import lombok.experimental.Accessors;
/**
* @author rtxtitanv
* @version 1.0.0
* @name com.rtxtitanv.model.UserDTO
* @description UserDTO
* @date 2021/8/18 16:45
*/
@Accessors(chain = true)
@Data
public class UserDTO {
private Long userId;
private String userName;
private Integer userAge;
private StringhCmaUdpV gender;
private String email;
private String birthday;
}
三、编写配置文件
resources/dozer/目录下创建Dozer的全局配置文件global-dozer.xml:
xmlns="http://dozermapper.github.io/schema/bean-mapping" xsi:schemaLocation="http://dozermapper.github.io/schema/bean-mapping http://dozermapper.github.io/schema/bean-mapping.xsd">
xmlns="http://dozermapper.github.io/schema/bean-mapping"
xsi:schemaLocation="http://dozermapper.github.io/schema/bean-mapping
http://dozermapper.github.io/schema/bean-mapping.xsd">
resources/dozer/目录下创建Dozer的映射文件dozer.xml:
xmlns="http://dozermapper.github.io/schema/bean-mapping" xsi:schemaLocation="http://dozermapper.github.io/schema/bean-mapping http://dozermapper.github.io/schema/bean-mapping.xsd"> userId userName userAge
xmlns="http://dozermapper.github.io/schema/bean-mapping"
xsi:schemaLocation="http://dozermapper.github.io/schema/bean-mapping
http://dozermapper.github.io/schema/bean-mapping.xsd">
userId
userName
userAge
resources目录下创建application.yml配置文件:
dozer:
# 指定Dozer的映射配置文件位置
mapping-files:
- classpath:dozer/global-dozer.xml
- classpath:dozer/dozer.xml
四、创建测试类
创建单元测试类DozerTest:
package com.rtxtitanv;
import com.github.dozermapper.core.Mapper;
import com.rtxtitanv.model.*;
import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import javax.annotation.Resource;
/**
* @author rtxtitanv
* @version 1.0.0
* @name com.rtxtitanv.DozerTest
* @description Dozer单元测试类
* @date 2021/8/18 16:44
*/
@Slf4j
@SpringBootTest
class DozerTest {
@Resource
private Mapper mapper;
@Test
void test1() {
UserDTO userDTO = new UserDTO();
userDTO.setUserId(1L).setUserName("ZhaoYun").setGender("男").setUserAge(20).setEmail("zhaoyun@xxx.com")
.setBirthday("2001/8/18 18:05:32");
User user = mapper.map(userDTO, User.class);
log.info(user.toString());
UserDTO userDTO2 = mapper.map(user, UserDTO.class);
log.info(userDTO2.toString());
}
}
执行测试方法,发现User和UserDTO相互转换成功:
五、Dozer的基本使用
下面对Dozer的一些基本使用进行总结。Dozer支持注解、API、XML三种映射配置方式,XML方式比较常用,前面使用的也是XML映射配置方式。XML映射配置中mapping元素的map-id属性可以设置该映射的标识,通过此标识来确定使用该映射关系。
在dozer.xml中新增以下配置:
userId
userName
userAge
新增以下测试方法:
@Test
void test2() {
UserDTO userDTO = new UserDTO();
userDTO.setUserId(2L).setUserName("MaChao").setGender("男").setUserAge(21).setEmail("machao@xxx.com")
.setBirthday("2000/6/15 08:45:20");
User user = mapper.map(userDTO, User.class, "user");
log.info(user.toString());
}
执行测试方法,发现转换成功:
在调用map方法时也可以直接指定要转换的目标对象。新增以下测试方法:
@Test
void test3() {
UserDTO userDTO = new UserDTO();
userDTO.setUserId(3L).setUserName("LiuBei").setGender("男").setUserAge(30).setEmail("liubei@xxx.com")
.setBirthday("1991/1/20 13:36:55");
User user = new User();
mapper.map(userDTO, user, "user");
log.info(user.toString());
}
执行测试方法,发现转换成功:
通过field-exclude标签可以设置不想进行转换的属性,这些属性在进行转换时会被自动排除。
在dozer.xml中新增以下配置:
userId
userName
userAge
新增以下测试方法:
@Test
void test4() {
UserDTO userDTO = new UserDTO();
userDTO.setUserId(1L).setUserName("ZhaoYun").setGender("男").setUserAge(20).setEmail("zhaoyun@xxx.com")
.setBirthday("2001/8/18 18:05:32");
User user = mapper.map(userDTO, User.class, "user-exclude");
log.info(user.toString());
}
执行测试方法,发现email属性被成功排除:
Dozer中的映射方式默认都是双向映射,如果想让转换不可逆,即只需要单向转换,可以设置mapping元素的type属性为one-way来开启单向映射。
在dozer.xml中新增以下配置:
id
name
age
新增以下测试方法:
@Test
void test5() {
UserDTO userDTO = new UserDTO();
userDTO.setUserId(1L).setUserName("ZhaoYun").setGender("男").setUserAge(20).setEmail("zhaoyun@xxx.com")
.setBirthday("2001/8/18 18:05:32");
User user = mapper.map(userDTO, User.class, "user-oneway");
log.info(user.toString());
UserDTO userDTO2 = mapper.map(user, UserDTO.class, "user-oneway");
log.info(userDTO2.toString());
}
执行测试方法,发现只有UserDTO转换为User成功:
当两个实体类中都嵌套有能够互相转换的实体类型属性时,也可以进行相互转换。
创建Order类:
package com.rtxtitanv.model;
import lombok.Data;
import lombok.experimental.Accessors;
/**
* @author rtxtitanv
* @version 1.0.0
* @name com.rtxtitanv.model.Order
* @description Order
* @date 2021/8/18 16:45
*/
@Accessors(chain = true)
@Data
public class Order {
private Long id;
private String number;
private String description;
private User user;
}
创建OrderDTO类:
package com.rtxtitanv.model;
import lombok.Data;
import lombok.experimental.Accessors;
/**
* @author rtxtitanv
* @version 1.0.0
* @name com.rtxtitanv.model.OrderDTO
* @description OrderDTO
* @date 2021/8/18 16:45
*/
@Accessors(chain = true)
@Data
public class OrderDTO {
private Long orderId;
private String orderNumber;
private String orderDescription;
private UserDTO userDTO;
}
在dozer.xml中新增以下配置:
orderId
orderNumber
orderDescription
userDTO
新增以下测试方法:
@Test
void test6() {
OrderDTO orderDTO = new OrderDTO();
UserDTO userDTO = new UserDTO().setUserId(6L).setUserName("DiaoChan").setGender("女").setUserAge(18)
.setEmail("diaochan@xxx.com").setBirthday("2003/12/27 23:10:36");
orderDTO.setOrderId(1L).setOrderNumber("78956328").setOrderDescription("二两麻辣牛肉面").setUserDTO(userDTO);
Order order = mapper.map(orderDTO, Order.class, "order");
log.info(order.toString());
OrderDTO orderDTO2 = mapper.map(order, OrderDTO.class, "order");
log.info(orderDTO2.toString());
}
执行测试方法,发现Order和OrderDTO相互转换成功:
Dozer还可以对深层属性进行映射,即深度映射。例如一个对象中的String类型属性可以与另一个对象中嵌套的对象的属性进行映射。
创建UserInfo类:
package com.rtxtitanv.model;
import lombok.Data;
import lombok.experimental.Accessors;
/**
* @author rtxtitanv
* @version 1.0.0
* @name com.rtxtitanv.model.UserInfo
* @description UserInfo
* @date 2021/8/18 16:45
*/
@Accessors(chain = true)
@Data
public class UserInfo {
private String gender;
private String email;
private String birthday;
}
创建UserInfoDTO类:
package com.rtxtitanv.model;
import lombok.Data;
import lombok.experimental.Accessors;
/**
* @author rtxtitanv
* @version 1.0.0
* @name com.rtxtitanv.model.UserInfoDTO
* @description UserInfoDTO
* @date 2021/8/18 16:45
*/
@Accessors(chain = true)
@Data
public class UserInfoDTO {
private Long userId;
private String userName;
private Integer userAge;
private UserInfo userInfo;
}
在dozer.xml中新增以下配置:
id
name
age
gender
birthday
新增以下测试方法:
@Test
void test7() {
UserInfo userInfo = new UserInfo();
userInfo.setGender("男").setEmail("zhaoyun@xxx.com").setBirthday("2001/8/18 18:05:32");
UserInfoDTO userInfoDTO = new UserInfoDTO();
userInfoDTO.setUserId(1L).setUserName("ZhaoYun").setUserAge(20).setUserInfo(userInfo);
User user = mapper.map(userInfoDTO, User.class, "user-deep-mapping");
log.info(user.toString());
}
执行测试方法,发现UserInfoDTO成功转换为User:
Dozer还支持注解方式配置映射,使用@Mapping注解可以进行一些简单的映射处理。
创建UserEntity类:
package com.rtxtitanv.model;
import com.github.dozermapper.core.Mapping;
import lombok.Data;
import lombok.experimental.Accessors;
/**
* @author rtxtitanv
* @version 1.0.0
* @name com.rtxtitanv.model.UserEntity
* @description UserEntity
* @date 2021/8/18 16:45
*/
@Accessors(chain = true)
@Data
public class UserEntity {
@Mapping(value = "userId")
private Long id;
@Mapping(value = "userName")
private String name;
@Mapping(value = "userAge")
private Integer age;
private String gender;
private String email;
private String birthday;
}
@Mapping只需要在源类中指定目标类中对应的属性即可。
创建UserVO类:
package com.rtxtitanv.model;
import lombok.Data;
import lombok.experimental.Accessors;
import java.util.Date;
/**
* @author rtxtitanv
* @version 1.0.0
* @name com.rtxtitanv.model.UserVO
* @description UserVO
* @date 2021/8/18 16:45
*/
@Accessors(chain = true)
@Data
public class UserVO {
private Long userId;
private String userName;
private Integer userAge;
private String gender;
private String email;
private Date birthday;
}
新增以下测试方法:
@Test
void test8() {
UserEntity userEntity = new UserEntity();
userEntity.setId(1L).setName("ZhaoYun").setGender("男").setAge(20).setEmail("zhaoyun@xxx.com")
.setBirthday("2001/8/18 18:05:32");
UserVO userVO = mapper.map(userEntity, UserVO.class);
log.info(userVO.toString());
}
执行测试方法,发现转换成功:
代码示例
Github:https://github.com/RtxTitanV/springboot-learning/tree/master/springboot2.x-learning/springboot-dozer
Gitee:https://gitee.com/RtxTitanV/springboot-learning/tree/master/springboot2.x-learning/springboot-dozer
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