推荐一款 Java 对象映射神器！
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前言
调用getter/setter方法进行属性赋值 调用BeanUtil.copyPropertie进行反射属性赋值
第一种方式不必说，属性多了就需要写一大坨getter/setter代码。第二种方式比第一种方式要简便很多，但是坑巨多，比如sources与target写反，难以定位某个字段在哪里进行的赋值，同时因为用到反射，导致性能也不佳。
准备工作
@Data
@Accessors(chain = true)
public class User {
private Long id;
private String username;
private String password;
private Integer sex;
private LocalDate birthday;
private LocalDateTime createTime;
private String config;
private String test;
}
@Data
@Accessors(chain = true)
public class UserVo {
private Long id;
private String username;
private String password;
private Integer gender;
private LocalDate birthday;
private String createTime;
private List config;
private String test;
@Data
public static class UserConfig {
private String field1;
private Integer field2;
}
} 一、MapStruct 配置以及基础使用
<dependency>
<groupId>org.mapstructgroupId>
<artifactId>mapstructartifactId>
<version>1.3.1.Finalversion>
dependency>
<dependency>
<groupId>org.mapstructgroupId>
<artifactId>mapstruct-processorartifactId>
<version>1.3.1.Finalversion>
dependency>@MapperConfig
public interface BaseMapping {
/**
* 映射同名属性
*/
@Mapping(target = "createTime", dateFormat = "yyyy-MM-dd HH:mm:ss")
TARGET sourceToTarget(SOURCE var1);
/**
* 反向，映射同名属性
*/
@InheritInverseConfiguration(name = "sourceToTarget")
SOURCE targetToSource(TARGET var1);
/**
* 映射同名属性，集合形式
*/
@InheritConfiguration(name = "sourceToTarget")
List sourceToTarget(List var1);
/**
* 反向，映射同名属性，集合形式
*/
@InheritConfiguration(name = "targetToSource")
List targetToSource(List var1);
/**
* 映射同名属性，集合流形式
*/
List<TARGET> sourceToTarget(Stream<SOURCE> stream);
/**
* 反向，映射同名属性，集合流形式
*/
List<SOURCE> targetToSource(Stream<TARGET> stream);
} import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
@Mapper(componentModel = "spring")
public interface UserMapping extends BaseMapping<User, UserVo> {
@Mapping(target = "gender", source = "sex")
@Mapping(target = "createTime", dateFormat = "yyyy-MM-dd HH:mm:ss")
@Override
UserVo sourceToTarget(User var1);
@Mapping(target = "sex", source = "gender")
@Mapping(target = "password", ignore = true)
@Mapping(target = "createTime", dateFormat = "yyyy-MM-dd HH:mm:ss")
@Override
User targetToSource(UserVo var1);
default List strConfigToListUserConfig(String config) {
return JSON.parseArray(config, UserConfig.class);
}
default String listUserConfigToStrConfig(List list) {
return JSON.toJSONString(list);
}
}二、自定义属性类型转换方法
default List strConfigToListUserConfig(String config) {
return JSON.parseArray(config, UserConfig.class);
}
default String listUserConfigToStrConfig(List list) {
return JSON.toJSONString(list);
} 三、单元测试
@Slf4j
@RunWith(SpringRunner.class)
@SpringBootTest
public class MapStructTest {
@Resource
private UserMapping userMapping;
@Test
public void tetDomain2DTO() {
User user = new User()
.setId(1L)
.setUsername("zhangsan")
.setSex(1)
.setPassword("abc123")
.setCreateTime(LocalDateTime.now())
.setBirthday(LocalDate.of(1999, 9, 27))
.setConfig("[{\"field1\":\"Test Field1\",\"field2\":500}]");
UserVo userVo = userMapping.sourceToTarget(user);
log.info("User: {}", user);
log.info("UserVo: {}", userVo);
}
@Test
public void testDTO2Domain() {
UserConfig userConfig = new UserConfig();
userConfig.setField1("Test Field1");
userConfig.setField2(500);
UserVo userVo = new UserVo()
.setId(1L)
.setUsername("zhangsan")
.setGender(2)
.setCreateTime("2020-01-18 15:32:54")
.setBirthday(LocalDate.of(1999, 9, 27))
.setConfig(Collections.singletonList(userConfig));
User user = userMapping.targetToSource(userVo);
log.info("UserVo: {}", userVo);
log.info("User: {}", user);
}四、常见问题
代码下载
参考
https://mapstruct.org/documentation/stable/reference/html/
https://mapstruct.org/faq/
https://github.com/mapstruct/mapstruct-examples
http://www.kailing.pub/MapStruct1.3/index.html
https://www.cnblogs.com/javaguide/p/11861749.html
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