mapstruct的用法之qualifiedByName示例详解

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

 <!-- https://mvnrepository.com/artifact/org.mapstruct/mapstruct-jdk8 -->
        <dependency>
            <groupid>org.mapstruct</groupid>
            <artifactid>mapstruct-jdk8</artifactid>
            <version>1.2.0.final</version>
        </dependency>

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;
/**
 * <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));
    }
}

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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