【Java】Spring中BeanUtils.copyProperties的坑及解决

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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&gt;() {{

            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;

    }

}

1

BeanUtils.copyProperties(source, target);

1

BeanUtil.copyProperties(source, target, ignoreNullValue);