1. 类所属
   BeanUtils.copyProperties的全路径名是：org.springframework.beans.BeanUtils.copyProperties
2. 类作用
   进行对象之间属性的赋值，避免用过get、set方法一个个属性的赋值
3. 方法体

    * Copy the property values of the given source bean into the target bean.
    * <p>Note: The source and target classes do not have to match or even be derived
    * from each other, as long as the properties match. Any bean properties that the
    * source bean exposes but the target bean does not will silently be ignored.
    * <p>This is just a convenience method. For more complex transfer needs,
    * consider using a full BeanWrapper.
    * @param source the source bean //源对象
    * @param target the target bean //目标对象
    * @throws BeansException if the copying failed //异常类型
    * @see BeanWrapper
    */
   public static void copyProperties(Object source, Object target) throws BeansException {
   	copyProperties(source, target, null, (String[]) null);
   }
   

4. 用法

/**
 * @author wxj
 * @date 2021年07月30日 11:56
 */

@Data
public class Father {
   private String face; // 长相
   private String height; // 身高
   private Life life; // 生命
}

@Data
public class Life {
   private String status;
}

@Data
public class Son extends Father {
    private Life life;

    public static void main(String[] args) {
        Father zs = new Father();
        zs.setFace("张三");
        zs.setHeight("身高250");

        Life zsLife = new Life();
        zsLife.setStatus("活着");
        zs.setLife(zsLife);

        Son ls=new Son();
        BeanUtils.copyProperties(zs,ls);
        
        System.out.println("height:"+ls.getHeight()+"  face:"+ls.getFace()+"  life:"+ls.getLife());
    }
}

//控制台打印
height:身高250  face:张三  life:Life(status=活着)

可以看到Father和Lif类属性赋值给了Son

5.总结
BeansUtils.copyProperties通过调用set方法完成赋值，所有是浅拷贝