一，問題背景
以往我們做單體系統的時候，沒有那麼複雜的架構，出參，入參都非常簡單，很多人都會直接用map來進行組裝，但是後面的系統越來越複雜，map的弊端出現了。
現在前後端分離，前端經常需要看後端有哪些接口，這就需要後端提供明确的出參及出參，這時候，就出現了非常多的對象，像VO，DTO，DO等。
對象有了，解決了領域對象的區分問題，但是也帶來了兩個問題
1、對象轉化問題
2、對象轉化的性能問題
今天我們來聊聊，現有的對象複制，哪些性能最快
二，對象複制有哪些方式
1、apache的BeanUtils
2、apache的PropertyUtils
3、Spring的BeanUtils
4、Spring的BeanCopier
5、采用位元組碼的Asm的BeanCopier
6、cglib的BeanCopier
7、最原始的setget
三，測試
1，引入最新包體
<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，定義7個方法體
/**
* 采用apache common的BeanUtils對象複制
* @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();
// 一百萬次
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耗時" + mis + "毫秒");
}
/**
* 采用apache common的PropertyUtils對象複制
* @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();
// 一百萬次
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耗時" + mis + "毫秒");
} /**
* 使用spring的beanUtils進行對象複制
* @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耗時" + mis + "毫秒");
} /**
* 使用spring的beanCopier進行對象複制
* @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耗時" + mis + "毫秒");
} /**
* 采用asm進行對象複制
* @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耗時" + mis + "毫秒");
} /**
* 采用cglib進行對象複制
* @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耗時" + mis + "毫秒");
}
/**
* 普通setget的耗時
* @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的耗時" + mis + "毫秒");
} public static void main(String[] args) throws Exception {
beanCopier();
propertyCopier();
springBeanUtilsCopier();
springBeanCopierCopier();
asmBeanCopier();
cglibBeanCopier();
setGetCopier();
} apache的BeanUtils耗時3840毫秒
apache的PropertyUtils耗時1924毫秒
Spring的BeanUtils耗時2537毫秒
Spring的BeanCopier耗時67毫秒
asm的BeanCopier耗時437毫秒
cglib的BeanCopier耗時6毫秒
setget的耗時10毫秒 ![怎樣使用SpringMVC控制頁面[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)