SpringBoot2.x集成Dozer的示例代码

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


    com.github.dozermapper
    dozer-spring-boot-starter
    6.5.0


    org.springframework.boot
    spring-boot-starter-test
    test



    org.projectlombok
    lombok
    1.18.8

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 String 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



    
    
        yyyy/MM/dd HH:mm:ss
    

resources/dozer/目录下创建Dozer的映射文件dozer.xml



    
    
        com.rtxtitanv.model.User
        com.rtxtitanv.model.UserDTO
        
            id
            userId
        
        
            name
            userName
        
        
            age
            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:

1

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。

dozer.xml中新增以下配置:



    com.rtxtitanv.model.User
    com.rtxtitanv.model.UserDTO
    
        id
        userId
    
    
        name
        userName
    
    
        age
        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:

2

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:

3

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。

dozer.xml中新增以下配置:


    com.rtxtitanv.model.User
    com.rtxtitanv.model.UserDTO
    
        id
        userId
    
    
        name
        userName
    
    
        age
        userAge
    
    
        email
        email
    

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:

4

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。

dozer.xml中新增以下配置:



    com.rtxtitanv.model.UserDTO
    com.rtxtitanv.model.User
    
        userId
        id
    
    
        userName
        name
    
    
        userAge
        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:

5

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;
}

dozer.xml中新增以下配置:


    com.rtxtitanv.model.Order
    com.rtxtitanv.model.OrderDTO
    
        id
        orderId
    
    
        number
        orderNumber
    
    
        description
        orderDescription
    
    
        user
        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:

6

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;
}

dozer.xml中新增以下配置:


    com.rtxtitanv.model.UserInfoDTO
    com.rtxtitanv.model.User
    
        userId
        id
    
    
        userName
        name
    
    
        userAge
        age
    
    
        userInfo.gender
        gender
    
    
        userInfo.email
        email
    
    
        userInfo.birthday
        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:

7

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:

8

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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