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This article mainly introduces the relevant knowledge of "how to use the qualifiedByName of mapstruct". The editor shows you the operation process through the actual case. The operation method is simple, fast and practical. I hope this article "how to use the qualifiedByName of mapstruct" can help you solve the problem.

It can be used to format decimal places, and so on. Formatting decimal places is done when po is converted to vo, so there is no need to write separate code to deal with decimal places.

1 reference pom1, can use mapstruct annotations normally, but will not generate Impl class

Org.mapstruct mapstruct-jdk8 1.2.0.Final

The Impl class is generated by referencing pom2.

2 define 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") / / requires a name, otherwise an error can be reported, which can be consistent with the method name, or inconsistent with default Double formatDouble (Double source) {DecimalFormat decimalFormat = new DecimalFormat ("0.00"). / / format if (source = = null) {source = 0. 0;} return Double.parseDouble (decimalFormat.format (source));}}

3 define source and target classes

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 look at the generated Impl class 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 Test

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

Output:

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

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