mapstruct DTO转换使用

定义一个基础接口

package com.example.mapstruct;import org.mapstruct.Named;import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.util.Date;
import java.util.List;/*** @Author zmn @Date 2024/11/27 11:17 @Version 1.0*/
public interface BaseConverter<DTO, DB> {DTO do2Dto(DB db);List<DTO> dosToDtos(List<DB> dbs);@Named("localDateToLocalDateTime")default LocalDateTime localDateToLocalDateTime(LocalDate date) {return date.atStartOfDay();}@Named("localDateTimeToDate")default Date localDateTimeToDate(LocalDateTime localDateTime) {if (null == localDateTime) {return null;}ZonedDateTime zonedDateTime = localDateTime.atZone(ZoneId.systemDefault());return Date.from(zonedDateTime.toInstant());}@Named("localDateToDate")default Date localDateTimeToDate(LocalDate localDateTime) {if (null == localDateTime) {return null;}ZonedDateTime zonedDateTime = localDateTime.atStartOfDay().atZone(ZoneId.systemDefault());return Date.from(zonedDateTime.toInstant());}
}

定义 dtoA 和dtoB 将dtoA 转成B(属性名不一样属性类型不一样)

@Data
public class BeanA {
private LocalDate localDate;
}
@Data
public class BeanB {
private LocalDateTime localDateTime;

}

@Mapper
public interface DtoBeanConverter extends BaseConverter<BeanB, BeanA> {DtoBeanConverter INSTANCE = Mappers.getMapper(DtoBeanConverter.class);@Mappings({@Mapping(source = "localDate",target = "localDateTime",qualifiedByName = "localDateToLocalDateTime")})BeanB do2Dto(BeanA beanA);
}

注意
1、在 POM中添加lombok一定在前才能生成DtoBeanConverterImpl
2、LocalDateTime 日期类型来自同一个包

 <plugin><configuration><annotationProcessorPaths><path><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.28</version></path><path><groupId>org.mapstruct</groupId><artifactId>mapstruct-processor</artifactId><version>1.5.3.Final</version></path></annotationProcessorPaths></configuration></plugin>

或者单独定义

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;public class DateMapper {// 将 LocalDateTime 转换为 Datepublic Date map(LocalDateTime value) {if (value == null) {return null;}return Date.from(value.atZone(ZoneId.systemDefault()).toInstant());}
}

在类中使用

import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.factory.Mappers;@Mapper(uses = DateMapper.class)
public interface MyMapper {MyMapper INSTANCE = Mappers.getMapper(MyMapper.class);@Mapping(source = "dateTime", target = "dateTime")Target map(Source source);
}