Java | 泛型思想 | 属性拷贝例子 | BeanUtils.copyProperties()

m0_59259076

已于 2023-04-10 10:14:22 修改

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分类专栏：后端文章标签： java 后端

于 2022-06-19 09:18:53 首次发布

本文链接：https://blog.youkuaiyun.com/m0_59259076/article/details/125354587

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package com.zhang;
import com.zhang.entity.Animal;
import com.zhang.mapper.AnimalMapper;
import lombok.Builder;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.junit.runner.RunWith;
import org.springframework.beans.BeanUtils;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import javax.annotation.Resource;
/**
 * @Author lgz
 * @Description
 * @Date 2022/6/4.
 */
@Slf4j
@SpringBootTest(classes = {App.class})
@RunWith(SpringRunner.class)
public class Test {
    @Resource
    private AnimalMapper animalMapper;
    @org.junit.Test
    public void test() {
        AnimalDTO animalDTO = AnimalDTO.builder().name("大肥狗").age(2).hobby("骨头").build();
        System.out.println(new AnimalConvert().convert(animalDTO));
    }
}
@Data
@Builder
class AnimalDTO {
    private String name;
    private String hobby;
    private Integer age;
}
interface ConvertDTO<S, T> {
    T convert(S s);
}
class AnimalConvert implements ConvertDTO<AnimalDTO, Animal> {

    @Override
    public Animal convert(AnimalDTO o) {
        Animal target = new Animal();
        BeanUtils.copyProperties(o, target);
        return target;
    }
}

使用静态内部类的方式也可以达到相同的效果：

package com.zhang;
import com.zhang.entity.Animal;
import com.zhang.mapper.AnimalMapper;
import lombok.Builder;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.junit.runner.RunWith;
import org.springframework.beans.BeanUtils;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import javax.annotation.Resource;
/**
 * @Author lgz
 * @Description
 * @Date 2022/6/4.
 */
@Slf4j
@SpringBootTest(classes = {App.class})
@RunWith(SpringRunner.class)
public class Test {
    @Resource
    private AnimalMapper animalMapper;
    @org.junit.Test
    public void test() {
        AnimalDTO animalDTO = AnimalDTO.builder().name("大肥狗").age(2).hobby("骨头").build();
        System.out.println(new AnimalConvert().convert(animalDTO));
    }
    
    private static class AnimalConvert implements ConvertDTO<AnimalDTO, Animal> {
        @Override
        public Animal convert(AnimalDTO o) {
            Animal target = new Animal();
            BeanUtils.copyProperties(o, target);
            return target;
        }
    }
}
@Data
@Builder
class AnimalDTO {
    private String name;
    private String hobby;
    private Integer age;
}
interface ConvertDTO<S, T> {
    T convert(S s);
}