[PHP知识库]springframework和apache提供的copyPropertie()使用详情比较

copyPropertie(Object source, Object target)
source 表示需要获得资源的bean对象
target 表示现有的bean对象

1.新建两个实体类UserVo,UserDTO

package com.fanfan.shiroadmin.modules.sys.entity;

import java.util.Date;

/**
 * @author DunFan.Liao
 * @date 2021/9/4 15:10
 */
public class UserDTO {
    private String userName;
    private Integer age;
    private Date date;

    public UserDTO() {

    }
    public UserDTO(String userName, Integer age, Date date) {
        this.userName = userName;
        this.age = age;
        this.date = date;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    @Override
    public String toString() {
        return "UserDTO{" +
                "userName='" + userName + '\'' +
                ", age=" + age +
                ", date=" + date +
                '}';
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public Integer getAge() {
        return age;
    }

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

package com.fanfan.shiroadmin.modules.sys.entity;

/**
 * @author DunFan.Liao
 * @date 2021/9/4 14:50
 */

public class UserVo {
    private String userName;
    private int age;

    public UserVo(String userName, int age) {
        this.userName = userName;
        this.age = age;
    }

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

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public int getAge() {
        return age;
    }

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

2.开始测试

2.1 使用org.springframework.beans.BeanUtils的copyProperties()方法

 @Test
    public void VOToDTOTest01(){
        log.info("测试开始。。。");
        for (int i = 0; i < 1000000; i++ ){
            UserVo userVo = new UserVo("张三", 18);
            UserDTO userDTO = new UserDTO();
            BeanUtils.copyProperties(userDTO,userVo);
            // log.info("userDTO值为 {}",userDTO);
        }
        log.info("测试结束");
    }
   

执行结果：
原因：
org.springframework.beans.BeanUtils的copyProperties()方法好像不支持拆箱操作，只能进行同等类型的copy操作

2.2改用org.apache.commons.beanutils.BeanUtils的copyProperties()方法

@Test
    public void VOToDTOTest02(){
        log.info("测试开始。。。");
        for (int i = 0; i < 1000000; i++ ){
            UserVo userVo = new UserVo("张三", 18);
            UserDTO userDTO = new UserDTO();
            try {
                BeanUtils.copyProperties(userDTO,userVo);
            } catch (IllegalAccessException | InvocationTargetException e) {
                log.error("userDTO值为{},错误提示为{}",userDTO.toString(),e.toString());
                e.printStackTrace();
            }
            // log.info("userDTO值为 {}",userDTO);
        }
        log.info("测试结束");

    }
    

测试结果：

执行100万次copy操作用来2秒左右的时间
此时想测试一下使用org.springframework.beans.BeanUtils的copyProperties()执行100万条copy需要多少时间

新建UserBo类

package com.fanfan.shiroadmin.modules.sys.entity;

/**
 * @author DunFan.Liao
 * @date 2021/9/4 16:38
 */
public class UserBo {
    private String userName;
    private int age;

    public UserBo(){
        
    }
    public UserBo(String userName, int age) {
        this.userName = userName;
        this.age = age;
    }

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

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public int getAge() {
        return age;
    }

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

进行单元测试

/** org.apache.commons.beanutils.BeanUtils */
    @Test
    public void VOToDTOTest04(){
        log.info("测试开始。。。");
        for (int i = 0; i < 1000000; i++ ){
            UserVo userVo = new UserVo("张三", 18);
            UserBo userBo= new UserBo();
            try {
                BeanUtils.copyProperties(userBo,userVo);
            } catch (IllegalAccessException | InvocationTargetException e) {
                log.error("userDTO值为{},错误提示为{}",userBo.toString(),e.toString());
                e.printStackTrace();
            }
            // log.info("userDTO值为 {}",userDTO);
        }
        log.info("测试结束");

    }

执行结果

 /** org.springframework.beans.BeanUtils; **/
    @Test
    public void VOToDTOTest05(){
        log.info("测试开始。。。");
        for (int i = 0; i < 1000000; i++ ){
            UserVo userVo = new UserVo("张三", 18);
            UserBo userBo = new UserBo();
            BeanUtils.copyProperties(userBo,userVo);
            // log.info("userDTO值为 {}",userDTO);
        }
        log.info("测试结束");

    }

测试结果：

只用了不到1s
得出结论:
在进行copy javaBean对象时 如果copy前后两个bean类型一致,使用springframework提供的copyProperties更快，不一致且对copy效率不是很看重的情况使用apache的copyProperties方法更合适。
而且springframework提供的copyProperties默认进行一次处理，而apache的copyProperties有强制的异常处理机制

使用get,set方法赋值

 @Test
    public void VOToDTOTest03(){
        log.info("测试开始。。。");
        for (int i = 0; i < 1000000; i++ ){
            UserVo userVo = new UserVo("张三", 18);
            UserDTO userDTO = new UserDTO();
            userDTO.setUserName(userVo.getUserName());
            userDTO.setAge(userVo.getAge());
            // log.info("userDTO值为 {}",userDTO);
        }
        log.info("测试结束");
    }

测试结果：
得出结论：使用get,set方法赋值效率最高，但是在实际开发中会出现很多的臃肿的代码块

4.提出疑问，寻求大佬解答

在alibaba代码规范中提出了DO,DTO,BO,AO,VO等概念，在代码运行的不同阶段，pojo之间是如何转换的？使用怎样的方式比较合适？不是很理解，希望有大佬的解答