mapstruct 映射列表——迹忆客-ag捕鱼王app官网

使用 mapstruct，我们可以以与映射 primitives 类似的方式映射列表。 要获取对象列表，我们应该提供一个可以映射对象的映射器方法。

语法

@mapper
public interface carmapper {
list getlistofstrings(list listofintegers);
list getcars(list carentities);
car getmodelfromentity(carentity carentity);
}

示例

打开使用 defaultexpression 映射章节中更新的项目映射。

使用以下代码更新 carentity.java

carentity.java ``java ackage com.jiyik.entity;

mport java.util.gregoriancalendar;

ublic class carentity { private int id; private double price; private gregoriancalendar manufacturingdate; private string name; public int getid() { return id; } public void setid(int id) { this.id = id; } public double getprice() { return price; } public void setprice(double price) { this.price = price; } public gregoriancalendar getmanufacturingdate() { return manufacturingdate; } public void setmanufacturingdate(gregoriancalendar manufacturingdate) { this.manufacturingdate = manufacturingdate; } public string getname() { return name; } public void setname(string name) { this.name = name; }

``

使用以下代码更新 car.java

car.java

package com.jiyik.model;
public class car {
    private int id;
    private string price;
    private string manufacturingdate;
    private string brand;
    private string name;
    public int getid() {
        return id;
    }
    public void setid(int id) {
        this.id = id;
    }
    public string getprice() {
        return price;
    }
    public void setprice(string price) {
        this.price = price;
    }
    public string getmanufacturingdate() {
        return manufacturingdate;
    }
    public void setmanufacturingdate(string manufacturingdate) {
        this.manufacturingdate = manufacturingdate;
    }
    public string getbrand() {
        return brand;
    }
    public void setbrand(string brand) {
        this.brand = brand;
    }
    public string getname() {
        return name;
    }
    public void setname(string name) {
        this.name = name;
    }
}

使用以下代码更新 carmapper.java

carmapper.java

package com.jiyik.mapper;
import com.jiyik.entity.carentity;
import com.jiyik.model.car;
import org.mapstruct.mapper;
import org.mapstruct.mapping;
import java.util.list;
import java.util.uuid;
@mapper( imports = uuid.class )
public interface carmapper {
    @mapping(source = "name", target = "name", defaultexpression = "java(uuid.randomuuid().tostring())")
    @mapping(target = "brand", constant = "bmw")
    @mapping(source = "price", target = "price", numberformat = "$#.00")
    @mapping(source = "manufacturingdate", target = "manufacturingdate", dateformat = "dd.mm.yyyy")
    car getmodelfromentity(carentity carentity);
    list getlistofstrings(list listofintegers);
    list getcars(list carentities);
}

使用以下代码更新 carmappertest.java

carmappertest.java

import com.jiyik.entity.carentity;
import com.jiyik.mapper.carmapper;
import com.jiyik.model.car;
import org.junit.test;
import org.mapstruct.factory.mappers;
import java.util.arrays;
import java.util.gregoriancalendar;
import java.util.list;
import static org.junit.assert.assertequals;
import static org.junit.assert.assertnotnull;
public class carmappertest {
    private carmapper carmapper = mappers.getmapper(carmapper.class);
    @test
    public void testentitytomodel() {
        carentity entity = new carentity();
        entity.setprice(345000);
        entity.setid(1);
        entity.setmanufacturingdate(new gregoriancalendar(2015, 3, 5));
        carentity entity1 = new carentity();
        entity1.setprice(445000);
        entity1.setid(2);
        entity1.setmanufacturingdate(new gregoriancalendar(2015, 3, 5));
        list carentities = arrays.aslist(entity, entity1);
        car model = carmapper.getmodelfromentity(entity);
        assertequals("$345000.00",model.getprice());
        assertequals(entity.getid(), model.getid());
        assertequals("bmw", model.getbrand());
        assertequals("05.04.2015", model.getmanufacturingdate());
        list list = arrays.aslist(1,2,3);
        list listofstrings = carmapper.getlistofstrings(list);
        list listofcars = carmapper.getcars(carentities);
        assertequals(3, listofstrings.size());
        assertequals(2, listofcars.size());
    }
}

运行以下命令来测试映射。

$ mvn clean test

执行结果如下