對象拷貝工具 Apache 的BeanUtils 和 Spring 的 BeanUtils

 

 導入不同的包結果完全不一樣

 Spring 的 BeanUtils  (推薦使用)

前一個內容 復制到 后一個  

 

Apache 的 BeanUtils (性能差 不推薦使用)

后一個內容 復制到 前一個

 

public class Student {

    /** 學號 */
    private long id;

    private String name;

    private int age;

    /** 年級 */
    private int grade;

    /** 專業 */
    private String major;

    /** 學校 */
    private String school;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

    public int getGrade() {
        return grade;
    }

    public void setGrade(int grade) {
        this.grade = grade;
    }

    public String getMajor() {
        return major;
    }

    public void setMajor(String major) {
        this.major = major;
    }

    public String getSchool() {
        return school;
    }

    public void setSchool(String school) {
        this.school = school;
    }

    public Student(long id, String name, int age, int grade, String major, String school) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
        this.grade = grade;
        this.major = major;
        this.school = school;
    }

    @Override
    public String toString() {
        return String.format("Student [id=%s, name=%s, age=%s, grade=%s, major=%s, school=%s]", id, name, age, grade,
                major, school);
    }

    
}

import java.lang.reflect.InvocationTargetException;

import org.springframework.beans.BeanUtils;

//import org.apache.commons.beanutils.BeanUtils;

public class Test {
    public static void main(String[] args) throws IllegalAccessException, InvocationTargetException {

        Student studentA = new Student(200123, "蘇明", 20, 1, "土木工程", null);
        Student studentB = new Student(200789, "張阿凡", 20, 3, "計算機工程", "蘇州工業大學");
        
        //后一個內容 復制到 前一個
        //用studentB 替換 studentA的字段內容
        BeanUtils.copyProperties(studentA, studentB);
        //結果都是后一個內容
        System.out.println(studentA);
        System.out.println(studentB);
        
    }
}

 

性能對比 https://www.jianshu.com/p/bcbacab3b89e