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 Date
    public 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);
}