Spring中BeanUtils.copyProperties的坑及解决

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.date.DateUtil;
import java.util.*;
public class Example {
    public static void main(String[] args) {
        // 创建一个子类对象
        Child source = new Child();
        source.setPublicField("public field");
        source.setProtectedField("protected field");
        source.setPrivateField("private field");
        source.setDateField(DateUtil.parse("2023-05-22"));
        source.setStringList(CollUtil.newArrayList("a", "b", "c"));
        source.setStringMap(new HashMap<String, String>() {{
            put("key1", "value1");
            put("key2", "value2");
        }});
        // 创建一个父类对象
        Parent target = new Parent();
        // 将子类对象的属性拷贝到父类对象中
        BeanUtil.copyProperties(source, target);
        // 输出父类对象中的属性
        System.out.println("publicField: " + target.getPublicField());
        System.out.println("protectedField: " + target.getProtectedField());
        System.println("privateField: " + target.getPrivateField());
        System.out.println("dateField: " + target.getDateField());
        System.out.println("stringList: " + target.getStringList());
        System.out.println("stringMap: " + target.getStringMap());
    }
}
// 父类
class Parent {
    private String privateField;
    private Date dateField;
    private List<String> stringList;
    private Map<String, String> stringMap;
    public String getPrivateField() {
        return privateField;
    }
    public void setPrivateField(String privateField) {
        this.privateField = privateField;
    }
    public Date getDateField() {
        return dateField;
    }
    public void setDateField(Date dateField) {
        this.dateField = dateField;
    }
    public List<String> getStringList() {
        return stringList;
    }
    public void setStringList(List<String> stringList) {
        this.stringList = stringList;
    }
    public Map<String, String> getStringMap() {
        return stringMap;
    }
    public void setStringMap(Map<String, String> stringMap) {
        this.stringMap = stringMap;
    }
}
// 子类
class Child extends Parent {
    public String publicField;
    protected String protectedField;
    public String getPublicField() {
        return publicField;
    }
    public void setPublicField(String publicField) {
        this.publicfield = publicField;
    }
    public String getProtectedField() {
        return protectedField;
    }
    public void setProtectedField(String protectedField) {
        this.protectedField = protectedField;
    }
    private String privateField;
    public String getPrivateField() {
        return privateField;
    }
    public void setPrivateField(String privateField) {
        this.privateField = privateField;
    }
}

BeanUtils.copyProperties(source, target);

BeanUtil.copyProperties(source, target, ignoreNullValue);