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>

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/xbq168/copy-property.git