springboot2.2.X手册：对象复制哪种最快？7种复制方式性能对比

目录

对象复制有哪些方式

引入最新包体

定义7个方法体

测试结果

---

以往我们做单体系统的时候，没有那么复杂的架构，出参，入参都非常简单，很多同学都会直接用map来进行组装，但是后面的系统越来越复杂，map的弊端出现了。

现在前后端分离，前端经常需要看后端有哪些接口，这就需要后端提供明确的出参及出参，这时候，就出现了非常多的对象，像VO，DTO，DO等。

对象有了，解决了领域对象的区分问题，但是也带来了两个问题

1、对象转化问题

2、对象转化的性能问题

今天我们来聊聊，现有的对象复制，哪些性能最快

 

 

 

对象复制有哪些方式

1、apache的BeanUtils

2、apache的PropertyUtils

3、Spring的BeanUtils

4、Spring的BeanCopier

5、采用字节码的Asm的BeanCopier

6、cglib的BeanCopier

7、最原始的setget

引入最新包体

		
			commons-beanutils
			commons-beanutils
			1.9.4
		

		
		
			cglib
			cglib
			3.3.0
		

		
		
			com.esotericsoftware
			reflectasm
			1.11.9
		

定义7个方法体

    /**
     * 采用apache common的BeanUtils对象复制
     * @author 溪云阁
     * @throws InvocationTargetException
     * @throws IllegalAccessException void
     */
    public static void beanCopier() throws InvocationTargetException, IllegalAccessException {
        final UserFrom userFrom = new UserFrom();
        userFrom.setName("name");
        userFrom.setCreateDate(new Date());
        userFrom.setId(1L);
        userFrom.setAge(10);
        final UserTo userTo = new UserTo();
        final long begin = System.currentTimeMillis();
        // 一百万次
        for (int i = 0; i < 1000000; i++) {
            BeanUtils.copyProperties(userTo, userFrom);
        }
        final long end = System.currentTimeMillis();
        final long mis = end - begin;
        System.out.println("apache的BeanUtils耗时" + mis + "毫秒");
    }

 /**
     * 采用apache common的PropertyUtils对象复制
     * @author 溪云阁
     * @throws IllegalAccessException
     * @throws NoSuchMethodException
     * @throws InvocationTargetException void
     */
    public static void propertyCopier() throws IllegalAccessException, NoSuchMethodException, InvocationTargetException {
        final UserFrom userFrom = new UserFrom();
        userFrom.setName("name");
        userFrom.setCreateDate(new Date());
        userFrom.setId(1L);
        userFrom.setAge(10);
        final UserTo userTo = new UserTo();
        final long begin = System.currentTimeMillis();
        // 一百万次
        for (int i = 0; i < 1000000; i++) {
            PropertyUtils.copyProperties(userTo, userFrom);
        }
        final long end = System.currentTimeMillis();
        final long mis = end - begin;
        System.out.println("apache的PropertyUtils耗时" + mis + "毫秒");
    }

  /**
     * 使用spring的beanUtils进行对象复制
     * @author 溪云阁
     * @throws IllegalAccessException
     * @throws InvocationTargetException void
     */
    public static void springBeanUtilsCopier() throws IllegalAccessException, InvocationTargetException {
        final UserFrom userFrom = new UserFrom();
        userFrom.setName("name");
        userFrom.setCreateDate(new Date());
        userFrom.setId(1L);
        userFrom.setAge(10);
        final UserTo userTo = new UserTo();
        final long begin = System.currentTimeMillis();
        for (int i = 0; i < 1000000; i++) {
            BeanUtils.copyProperties(userFrom, userTo);
        }
        final long end = System.currentTimeMillis();
        final long mis = end - begin;
        System.out.println("Spring的BeanUtils耗时" + mis + "毫秒");
    }

/**
     * 使用spring的beanCopier进行对象复制
     * @author 溪云阁  void
     */
    public static void springBeanCopierCopier() {
        final UserFrom userFrom = new UserFrom();
        userFrom.setName("name");
        userFrom.setCreateDate(new Date());
        userFrom.setId(1L);
        userFrom.setAge(10);
        final UserTo userTo = new UserTo();
        final long begin = System.currentTimeMillis();
final BeanCopier copier = BeanCopier.create(UserFrom.class, UserTo.class, false);
        for (int i = 0; i < 1000000; i++) {
            copier.copy(userFrom, userTo, null);
        }
        final long end = System.currentTimeMillis();
        final long mis = end - begin;
        System.out.println("Spring的BeanCopier耗时" + mis + "毫秒");
    }

  /**
     * 采用asm进行对象复制
     * @author 溪云阁  void
     */
    public static void asmBeanCopier() {
        final UserFrom userFrom = new UserFrom();
        userFrom.setName("name");
        userFrom.setCreateDate(new Date());
        userFrom.setId(1L);
        userFrom.setAge(10);
        final UserTo userTo = new UserTo();
        final long begin = System.currentTimeMillis();
        for (int i = 0; i < 1000000; i++) {
            AsmCopyUtils.copyProperties(userTo, userFrom);
        }
        final long end = System.currentTimeMillis();
        final long mis = end - begin;
        System.out.println("asm的BeanCopier耗时" + mis + "毫秒");
    }

/**
     * 采用cglib进行对象复制
     * @author 溪云阁  void
     */
    public static void cglibBeanCopier() {
        final UserFrom userFrom = new UserFrom();
        userFrom.setName("name");
        userFrom.setCreateDate(new Date());
        userFrom.setId(1L);
        userFrom.setAge(10);
        final UserTo userTo = new UserTo();
        final long begin = System.currentTimeMillis();
final BeanCopier copier = BeanCopier.create(UserFrom.class, UserTo.class, false);
        for (int i = 0; i < 1000000; i++) {
            copier.copy(userFrom, userTo, null);
        }
        final long end = System.currentTimeMillis();
        final long mis = end - begin;
        System.out.println("cglib的BeanCopier耗时" + mis + "毫秒");
    }

  /**
     * 普通setget的耗时
     * @author 溪云阁  void
     */
    public static void setGetCopier() {
        final UserFrom userFrom = new UserFrom();
        userFrom.setName("name");
        userFrom.setCreateDate(new Date());
        userFrom.setId(1L);
        userFrom.setAge(10);
        final UserTo userTo = new UserTo();
        final long begin = System.currentTimeMillis();
        for (int i = 0; i < 1000000; i++) {
            userTo.setName(userFrom.getName());
            userTo.setCreateDate(userFrom.getCreateDate());
            userTo.setId(userFrom.getId());
            userTo.setAge(userFrom.getAge());
        }
        final long end = System.currentTimeMillis();
        final long mis = end - begin;
        System.out.println("setget的耗时" + mis + "毫秒");
    }

 public static void main(String[] args) throws Exception {
        beanCopier();
        propertyCopier();
        springBeanUtilsCopier();
        springBeanCopierCopier();
        asmBeanCopier();
        cglibBeanCopier();
        setGetCopier();
    }

 

 

 

测试结果

apache的BeanUtils耗时3840毫秒
apache的PropertyUtils耗时1924毫秒
Spring的BeanUtils耗时2537毫秒
Spring的BeanCopier耗时67毫秒
asm的BeanCopier耗时437毫秒
cglib的BeanCopier耗时6毫秒
setget的耗时10毫秒

目前，从现有的数据上看，cglib是最快的，但是目前局限于数据量，设备等问题，只能做个初步判断，有兴趣的同学可自行实验。

 

 

--END--

作者：@溪云阁

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