mapstruct的用法之qualifiedByName示例详解 mapstruct的用法之qualifiedByName示

qualifiedByName的意思就是使用这个Mapper接口中的指定的默认方法去处理这个属性的转换，而不是简单的get set。网上一直没找到…
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.mapstructmapstruct-jdk81.2.0.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}

关于@Target注解的使用可见：
详解JDK 5 Annotation 注解之@Target的用法介绍
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