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>
<!-- https://mvnrepository.com/artifact/cglib/cglib -->
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>3.3.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.esotericsoftware/reflectasm -->
<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();
} 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 ![怎样使用SpringMVC控制页面[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)