基于Spring BeanUtils的copyProperties方法使用及注意事项

package com.demo;
import lombok.Data;
import org.springframework.beans.BeanUtils;
import java.util.Arrays;
import java.util.List;

public class BeanUtilsTest {
    @Data
    private static class CopyTest1 {
        private String outerName;
        private CopyTest1.InnerClass innerClass;
        private List clazz;
        @Data
        private static class InnerClass {
            public String innerName;
        }
    }
    @Data
    private static class CopyTest2 {
        private String outerName;
        private CopyTest2.InnerClass innerClass;
        private List clazz;
        @Data
        static class InnerClass {
            private String innerName;
        }
    }
    public static void main(String[] args) {
        CopyTest1 copyTest1 = new CopyTest1();
        copyTest1.outerName = "outer xiaobu";
        CopyTest1.InnerClass innerClass = new CopyTest1.InnerClass();
        innerClass.innerName = "inner xiaobu";
        copyTest1.innerClass = innerClass;
        copyTest1.clazz = Arrays.asList(1, 2, 3);
        System.out.println("copyTest1 = " + copyTest1);
        CopyTest2 copyTest2 = new CopyTest2();
        //未copy内部类的属性
        BeanUtils.copyProperties(copyTest1, copyTest2);
        System.out.println("copy内部类的属性前copyTest2 = " + copyTest2);
        CopyTest2.InnerClass innerClass2 = new CopyTest2.InnerClass();
        copyTest2.innerClass = innerClass2;
        BeanUtils.copyProperties(innerClass, innerClass2);
        System.out.println("copy内部类的属性后copyTest2 = " + copyTest2);
    }
}

package com.demo;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;

public class Demo {
    public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        ArrayList<Integer> list = new ArrayList<Integer>();
        list.add(111);
        list.add(222);
        list.add("xiaobu");  //编译器报错
        Class clazz3 = Class.forName("java.util.ArrayList");//获取ArrayList的字节码文件
        Method m = clazz3.getMethod("add", Object.class);//获取add() 方法，Object.class 代表任意对象类型的数据
        m.invoke(list,"xiaobu");//通过反射添加字符串类型元素数据
        System.out.println(list);//运行结果：[111, 222, xiaobu]
    }
}

BeanUtils.copyProperties(A,B);

BeanUtils.copyProperties(A,B);