Dozer是一种Java Bean-to-Bean映射框架,它允许简单而灵活地配置Java对象之间的字段映射。Dozer可以映射同一类型的不同对象、不同类型之间的对象、以及对象之间的集合。它还支持许多高级映射选项,例如自定义转换器和逐级映射。Dozer可以用于许多不同的应用程序,包括DAO和WebService。
dozer的maven坐标:
<dependency>
<groupId>com.github.dozermapper</groupId>
<artifactId>dozer-core</artifactId>
<version>6.5.0</version>
</dependency>
为了简化使用方式,dozer还提供了starter,其maven坐标为:
<dependency>
<groupId>com.github.dozermapper</groupId>
<artifactId>dozer-spring-boot-starter</artifactId>
<version>6.5.0</version>
</dependency>
package com.rqz.dto;
import lombok.Data;
@Data
public class UserDTO {
private String userId;
private String userName;
private int userAge;
private String address;
private String birthday;
}
package com.rqz.entity;
import lombok.Data;
import java.util.Date;
@Data
public class UserEntity {
private String id;
private String name;
private int age;
private String address;
private Date birthday;
}
在resources/dozer/目录下创建dozer的全局配置文件global.dozer.xml
<?xml version="1.0" encoding="UTF-8"?>
<mappings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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">
<!--
全局配置:
<date-format>表示日期格式
-->
<configuration>
<date-format>yyyy-MM-dd</date-format>
</configuration>
</mappings>
注:全局配置文件名称可以任意
<?xml version="1.0" encoding="UTF-8"?>
<mappings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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">
<!--描述两个类中属性的对应关系,对于两个类中同名的属性可以不映射-->
<mapping date-format="yyyy-MM-dd">
<class-a>cn.rqz.entity.UserEntity</class-a>
<class-b>cn.rqz.dto.UserDTO</class-b>
<field>
<a>id</a>
<b>userId</b>
</field>
<field>
<a>name</a>
<b>userName</b>
</field>
<field>
<a>age</a>
<b>userAge</b>
</field>
</mapping>
<!--
可以使用map-id指定映射的标识,在程序中通过此标识来确定使用当前这个映射关系
-->
<mapping date-format="yyyy-MM-dd" map-id="user">
<class-a>cn.rqz.entity.UserEntity</class-a>
<class-b>cn.rqz.dto.UserDTO</class-b>
<field>
<a>id</a>
<b>userId</b>
</field>
<field>
<a>name</a>
<b>userName</b>
</field>
<field>
<a>age</a>
<b>userAge</b>
</field>
</mapping>
</mappings>
注:映射文件名称可以任意
dozer:
mappingFiles:
- classpath:dozer/global.dozer.xml
- classpath:dozer/biz.dozer.xml
@RunWith(SpringRunner.class)
@SpringBootTest(classes = DozerApp.class)
public class DozerTest {
@Autowired
private Mapper mapper;
//测试使用案例
@Test
public void testDozer1(){
UserDTO userDTO = new UserDTO();
userDTO.setUserId("100");
userDTO.setUserName("itcast");
userDTO.setUserAge(20);
userDTO.setAddress("bj");
userDTO.setBirthday("2010-11-20");
UserEntity user = mapper.map(userDTO, UserEntity.class);
System.out.println(user);
}
//测试覆盖案例
@Test
public void testDozer2(){
UserDTO userDTO = new UserDTO();
userDTO.setUserId("100");
userDTO.setUserName("itcast");
userDTO.setUserAge(20);
userDTO.setAddress("bj");
userDTO.setBirthday("2010-11-20");
UserEntity user = new UserEntity();
user.setId("200");
System.out.println(user);
mapper.map(userDTO,user);
System.out.println(user);
}
//测试指定映射的标识案例
@Test
public void testDozer3(){
UserDTO userDTO = new UserDTO();
userDTO.setUserId("100");
userDTO.setUserName("itcast");
userDTO.setUserAge(20);
userDTO.setAddress("bj");
UserEntity user = new UserEntity();
System.out.println(user);
mapper.map(userDTO,user,"user");
System.out.println(user);
}
}