<dependency>
    <groupId>commons-beanutils</groupId>
    <artifactId>commons-beanutils</artifactId>
    <version>1.9.3</version>
</dependency>

public class User {
    private String name;

    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

public class Person {
    private String name;

    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

import org.apache.commons.beanutils.BeanUtils;

import java.lang.reflect.InvocationTargetException;

public class BeanDemo {
    public static void main(String[] args) throws InvocationTargetException, IllegalAccessException {
        User user = new User();
        user.setAge(23);
        user.setName("Tom");

        System.out.println(user);
        // User{name='Tom', age=23}

        // 准备一个Person对象
        Person person = new Person();

        BeanUtils.copyProperties(person, user);

        System.out.println(person);
        // Person{name='Tom', age=23}

    }
}