对象复制性能对比（7种）

快来打我* 2021-09-21 09:04 294阅读 0赞

### 一，问题背景 ###

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，很多人都会直接用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

### 二，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

### 三，测试 ###

1，引入最新包体

<dependency>
    			<groupId>commons-beanutils</groupId>
    			<artifactId>commons-beanutils</artifactId>
    			<version>1.9.4</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>cglib</groupId>
    			<artifactId>cglib</artifactId>
    			<version>3.3.0</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>com.esotericsoftware</groupId>
    			<artifactId>reflectasm</artifactId>
    			<version>1.11.9</version>
    		</dependency>

2，定义7个方法体

/**
         * 采用apache common的BeanUtils对象复制
         * @author lwc
         * @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 lwc
         * @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 lwc
         * @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 lwc
         */
        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 lwc
         */
        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 lwc
         */
        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 lwc
         */
        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();
        }

3,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，有兴趣的可自行实验。**