mapstruct的qualifiedByName怎么用

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可用于格式化小数位等，在po转换为vo时就已格式化小数位完成，所以不必单独再写代码处理小数位。

1 引用pom1 ，能正常使用mapstruct的注解，但不会生成Impl类

                     org.mapstruct            mapstruct-jdk8            1.2.0.Final        

引用pom2 才会生成Impl类

2 定义ConvertMapper

package com.weather.weatherexpert.common.model.mapper;import com.weather.weatherexpert.common.model.po.AreaPO;import com.weather.weatherexpert.common.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;/** * 
Title: 
 * 
Description: 
 * */@Mapperpublic 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));    }}

3 定义源类和目标类

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;    ......    }

4 看生成的Impl类ConvertMapperImpl

package com.weather.weatherexpert.common.model.mapper;import com.weather.weatherexpert.common.model.po.AreaPO;import com.weather.weatherexpert.common.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;        }}

5 测试

        AreaPO areaPO = new AreaPO("忻州", 1, 1.256879);        AreaVO areaVO =                ConvertMapper.INSTANCE.areaPO2areaVO(areaPO);        logger.info("JSON.toJSONString(areaVO):" + JSON.toJSONString(areaVO));

输出：

JSON.toJSONString(areaVO):{"cityName":"忻州","haveAir":1,"pm25":1.26}

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