mapstruct的用法之qualifiedByName示例详解

<!-- https: //mvnrepository测试数据/artifact/org.mapstruct/mapstruct-jdk8 -->

        <dependency>

            <groupId>org.mapstruct</groupId>

            <artifactId>mapstruct-jdk8</artifactId>

            <version> 1.2 . 0 .Final</version>

        </dependency>

package com.weather.weatherexpert测试数据mon.model.mapper;

import com.weather.weatherexpert测试数据mon.model.po.AreaPO;

import com.weather.weatherexpert测试数据mon.model.vo.AreaVO;

import org.mapstruct.MapMapping;

import org.mapstruct.Mapper;

import org.mapstruct.Mapping;

import org.mapstruct.Named;

import org.mapstruct.factory.Mappers;

import java.text.DecimalFormat;

/**

  * <p>Title: </p>

  * <p>Description: </p>

  *

  */

@Mapper

public interface ConvertMapper {

     ConvertMapper INSTANCE = Mappers.getMapper(ConvertMapper. class );

     @Mapping (source = "pm25" , target = "pm25" , qualifiedByName = "formatDoubleDef" )

     AreaVO areaPO2areaVO(AreaPO areaPO);

     @Named ( "formatDoubleDef" ) //需要起个名字，不然报错,可以与方法名一致，当然也可以不一致

     default Double formatDouble(Double source) {

         DecimalFormat decimalFormat = new DecimalFormat( "0.00" ); //小数位格式化

         if (source == null ) {

             source = 0.0 ;

         }

         return Double.parseDouble(decimalFormat.format(source));

     }

}

public class AreaPO {

     private String cityName;

     private Integer haveAir;

     private Double pm25;

     private String pm10Str;

     ............

}

public class AreaVO {

     private String cityName;

     private Integer haveAir;

     private Double pm25;

     private String pm25Str;

     private Double pm10;

     ......   

}

package com.weather.weatherexpert测试数据mon.model.mapper;

import com.weather.weatherexpert测试数据mon.model.po.AreaPO;

import com.weather.weatherexpert测试数据mon.model.vo.AreaVO;

public class ConvertMapperImpl implements ConvertMapper {

     public ConvertMapperImpl() {

     }

     public AreaVO areaPO2areaVO(AreaPO areaPO) {

         if (areaPO == null ) {

             return null ;

         } else {

             AreaVO areaVO = new AreaVO();

             areaVO.setPm25( this .formatDouble(areaPO.getPm25()));

             areaVO.setCityName(areaPO.getCityName());

             areaVO.setHaveAir(areaPO.getHaveAir());

             return areaVO;

         }

}

AreaPO areaPO = new AreaPO( "忻州" , 1 , 1.256879 );

AreaVO areaVO =

         ConvertMapper.INSTANCE.areaPO2areaVO(areaPO);

logger.info( "JSON.toJSONString(areaVO):" + JSON.toJSONString(areaVO));