几种Bean的复制方法性能比较

　　由于项目对性能 速度要求很高，表中的字段也很多，存在一个复制方法，耗时相对比较长，经过测试，使用Apache，Spring等提供的方法 耗时较长，使用自己自定义的复制方法时间提升很多，现记录下。

1.pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion>
<groupId>com.xsjt.compare</groupId>
<artifactId>copy-property</artifactId>
<version>0.0.1-SNAPSHOT</version>

<dependencies>
<!-- apache -->
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.8.3</version>
</dependency>

<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>

<!-- cglib -->
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>3.2.3</version>
</dependency>

<!-- ezmorph -->
<dependency>
<groupId>net.sf.ezmorph</groupId>
<artifactId>ezmorph</artifactId>
<version>1.0.6</version>
</dependency>

</dependencies>
</project>

View Code
2.定义一个实体bean

package com.xsjt.bean;

import java.io.Serializable;
import java.math.BigDecimal;
import java.util.Date;

/**
* 用户实体类
* @author Administrator
*
*/
@SuppressWarnings("serial")
public class User implements Serializable{

private int id;
private String userName;
private String userPass;
private String phone;
private Date birth;
private BigDecimal totleMoney;
private String remark;

public User() {
super();
}

public User(int id, String userName, String userPass, String phone, Date birth, BigDecimal totleMoney, String remark) {
super();
this.id = id;
this.userName = userName;
this.userPass = userPass;
this.phone = phone;
this.birth = birth;
this.totleMoney = totleMoney;
this.remark = remark;
}

public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPass() {
return userPass;
}
public void setUserPass(String userPass) {
this.userPass = userPass;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public Date getBirth() {
return birth;
}
public void setBirth(Date birth) {
this.birth = birth;
}
public BigDecimal getTotleMoney() {
return totleMoney;
}
public void setTotleMoney(BigDecimal totleMoney) {
this.totleMoney = totleMoney;
}
public String getRemark() {
return remark;
}
public void setRemark(String remark) {
this.remark = remark;
}

@Override
public String toString() {
return "User [id=" + id + ", userName=" + userName + ", userPass=" + userPass + ", phone=" + phone + ", birth=" + birth + ", totleMoney=" + totleMoney + ", remark=" + remark + "]";
}

}

3.自己定义的bean复制方法

package com.xsjt.util;

import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.util.Date;
import com.xsjt.bean.User;

/**
* ClassName:CopyBeanProperty
* 在对象之间 进行属性值 复制
* Date:     2017年7月19日 下午5:53:07
* @author   Joe
* @version
* @since    JDK 1.8
*/
public class CopyBeanProperty {

/**
* 将 旧的bean的值 赋值 给 新的bean
* @param oldObj
* @param newObj
*/
public static void copyproperty(Object oldObj ,Object newObj){

Class<?> clz = oldObj.getClass();
Field[] cols = clz.getDeclaredFields();

String name = null;
Object value = null;
try {
for(Field col : cols){
if(!col.isAccessible()){
// 设置可访问
col.setAccessible(true);
}
name = col.getName();
value = col.get(oldObj);
// 赋值给 新的bean
setBeanProperty(name ,value ,newObj);
}
} catch (Exception e) {
e.printStackTrace();
}
}

/**
* 将 name 和  value 赋值给 新的bean
* @param name
* @param value
* @param newObj
* @throws SecurityException
* @throws NoSuchFieldException
* @throws IllegalAccessException
* @throws IllegalArgumentException
*/
private static void setBeanProperty(String name, Object value, Object newObj) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
Class<?> clz = newObj.getClass();
Field col = clz.getDeclaredField(name);
if(!col.isAccessible()){
// 设置可访问
col.setAccessible(true);
}
col.set(newObj, value);
}

/**
* 循环输入 属性 和 值 ，测试的 时候 使用
* @param newObj
* @throws IllegalAccessException
* @throws IllegalArgumentException
*/
private static void loopBeanProperty(Object newObj) throws IllegalArgumentException, IllegalAccessException{
Class<?> clz = newObj.getClass();
Field[] cols = clz.getDeclaredFields();
for(Field col : cols){
if(!col.isAccessible()){
// 设置可访问
col.setAccessible(true);
}
System.out.println(col.getName() + "-->" + col.get(newObj));
}
}

/**
* 测试
* @param args
*/
public static void main(String[] args) {
User user = new User(1, "admin", "12345", "135555555555", new Date(), new BigDecimal(20000.88), "土豪");
try {
loopBeanProperty(user);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
}

4.各种bean复制方法的比较

package com.xsjt.compare;

import java.math.BigDecimal;
import java.util.Date;
import org.apache.commons.beanutils.BeanUtils;
import com.xsjt.bean.User;
import com.xsjt.util.CopyBeanProperty;
import net.sf.cglib.beans.BeanCopier;
import net.sf.ezmorph.MorpherRegistry;
import net.sf.ezmorph.bean.BeanMorpher;

/**
* ClassName:CompareTest
* 测试 各种 复制 方法的性能
* Date:     2017年7月19日 下午5:53:07
* @author   Joe
* @version
* @since    JDK 1.8
*/
public class CompareTest {

public static void main(String[] args) throws Exception {

// 1.使用 apache 的 复制 方法
User orig = new User(1, "admin", "12345", "135555555555", new Date(), new BigDecimal(20000.88), "土豪");
User dest = new User();
long start = System.currentTimeMillis();
BeanUtils.copyProperties(dest, orig);
System.out.println("1.apache的方法 花费的时间：" + (System.currentTimeMillis() - start) + "ms");
System.out.println("dest==" + dest);

System.out.println("--------------------------------我是分割线------------------------------------------------");

// 2.使用 spring 的 复制方法
User source = new User(1, "admin", "12345", "135555555555", new Date(), new BigDecimal(20000.88), "土豪");
User target = new User();
start = System.currentTimeMillis();
org.springframework.beans.BeanUtils.copyProperties(source, target);
System.out.println("2.spring的方法 花费的时间：" + (System.currentTimeMillis() - start) + "ms");
System.out.println("target==" + target);

System.out.println("--------------------------------我是分割线------------------------------------------------");

// 3.使用 cglib 的复制方法
User source2 = new User(1, "admin", "12345", "135555555555", new Date(), new BigDecimal(20000.88), "土豪");
User target2 = new User();
start = System.currentTimeMillis();
BeanCopier.create(source2.getClass(), target2.getClass(), false).copy(source2, target2, null);
System.out.println("3.cglib的方法 花费的时间：" + (System.currentTimeMillis() - start) + "ms");
System.out.println("target2==" + target2);

System.out.println("--------------------------------我是分割线------------------------------------------------");

// 4.使用 EZMorph 的复制方法
User source3 = new User(1, "admin", "12345", "135555555555", new Date(), new BigDecimal(20000.88), "土豪");
User target3 = new User();
start = System.currentTimeMillis();
MorpherRegistry registry = new MorpherRegistry();
registry.registerMorpher(new BeanMorpher(User.class, registry));
target3 = (User) registry.morph(User.class, source3);
System.out.println("4.EZMorph的方法 花费的时间：" + (System.currentTimeMillis() - start) + "ms");
System.out.println("target3==" + target3);

System.out.println("--------------------------------我是分割线------------------------------------------------");

// 5.使用 自定义 的复制方法
User oldUser = new User(1, "admin", "12345", "135555555555", new Date(), new BigDecimal(20000.88), "土豪");
User newUser = new User();
start = System.currentTimeMillis();
CopyBeanProperty.copyproperty(oldUser, newUser);
System.out.println("5.自定义的方法 花费的时间：" + (System.currentTimeMillis() - start) + "ms");
System.out.println("newUser==" + newUser);
}
}

5.运行结果展示

　　


　　自定义的复制方法，使用了Java的反射机制实现，虽然其他的方法也是通过反射实现。但是自己定义的耗时时间最少，记录下，以备后用。

6.源码下载

　　https://git.oschina.net/xbq8023/copy-property.git