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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
1 <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"> 2 <modelVersion>4.0.0</modelVersion> 3 <groupId>com.xsjt.compare</groupId> 4 <artifactId>copy-property</artifactId> 5 <version>0.0.1-SNAPSHOT</version> 6 7 <dependencies> 8 <!-- apache --> 9 <dependency>10 <groupId>commons-beanutils</groupId>11 <artifactId>commons-beanutils</artifactId>12 <version>1.8.3</version>13 </dependency>14 15 <!-- Spring -->16 <dependency>17 <groupId>org.springframework</groupId>18 <artifactId>spring-beans</artifactId>19 <version>4.3.8.RELEASE</version>20 </dependency>21 22 <!-- cglib -->23 <dependency>24 <groupId>cglib</groupId>25 <artifactId>cglib</artifactId>26 <version>3.2.3</version>27 </dependency>28 29 <!-- ezmorph -->30 <dependency>31 <groupId>net.sf.ezmorph</groupId>32 <artifactId>ezmorph</artifactId>33 <version>1.0.6</version>34 </dependency>35 36 </dependencies>37 </project>
2.定义一个实体bean
1 package com.xsjt.bean; 2 3 import java.io.Serializable; 4 import java.math.BigDecimal; 5 import java.util.Date; 6 7 /** 8 * 用户实体类 9 * @author Administrator10 *11 */12 @SuppressWarnings("serial")13 public class User implements Serializable{14 15 private int id;16 private String userName;17 private String userPass;18 private String phone;19 private Date birth;20 private BigDecimal totleMoney;21 private String remark;22 23 public User() {24 super();25 }26 27 public User(int id, String userName, String userPass, String phone, Date birth, BigDecimal totleMoney, String remark) {28 super();29 this.id = id;30 this.userName = userName;31 this.userPass = userPass;32 this.phone = phone;33 this.birth = birth;34 this.totleMoney = totleMoney;35 this.remark = remark;36 }37 38 public int getId() {39 return id;40 }41 public void setId(int id) {42 this.id = id;43 }44 public String getUserName() {45 return userName;46 }47 public void setUserName(String userName) {48 this.userName = userName;49 }50 public String getUserPass() {51 return userPass;52 }53 public void setUserPass(String userPass) {54 this.userPass = userPass;55 }56 public String getPhone() {57 return phone;58 }59 public void setPhone(String phone) {60 this.phone = phone;61 }62 public Date getBirth() {63 return birth;64 }65 public void setBirth(Date birth) {66 this.birth = birth;67 }68 public BigDecimal getTotleMoney() {69 return totleMoney;70 }71 public void setTotleMoney(BigDecimal totleMoney) {72 this.totleMoney = totleMoney;73 }74 public String getRemark() {75 return remark;76 }77 public void setRemark(String remark) {78 this.remark = remark;79 }80 81 @Override82 public String toString() {83 return "User [id=" + id + ", userName=" + userName + ", userPass=" + userPass + ", phone=" + phone + ", birth=" + birth + ", totleMoney=" + totleMoney + ", remark=" + remark + "]";84 }85 86 }
3.自己定义的bean复制方法
1 package com.xsjt.util; 2 3 import java.lang.reflect.Field; 4 import java.math.BigDecimal; 5 import java.util.Date; 6 import com.xsjt.bean.User; 7 8 /** 9 * ClassName:CopyBeanProperty10 * 在对象之间 进行属性值 复制 11 * Date: 2017年7月19日 下午5:53:0712 * @author Joe 13 * @version 14 * @since JDK 1.815 */16 public class CopyBeanProperty {17 18 /**19 * 将 旧的bean的值 赋值 给 新的bean20 * @param oldObj21 * @param newObj22 */23 public static void copyproperty(Object oldObj ,Object newObj){24 25 Class<?> clz = oldObj.getClass();26 Field[] cols = clz.getDeclaredFields();27 28 String name = null;29 Object value = http://www.mamicode.com/null;30 try {31 for(Field col : cols){32 if(!col.isAccessible()){33 // 设置可访问34 col.setAccessible(true);35 }36 name = col.getName();37 value =http://www.mamicode.com/ col.get(oldObj);38 // 赋值给 新的bean39 setBeanProperty(name ,value ,newObj);40 }41 } catch (Exception e) {42 e.printStackTrace();43 }44 }45 46 /**47 * 将 name 和 value 赋值给 新的bean48 * @param name49 * @param value50 * @param newObj51 * @throws SecurityException 52 * @throws NoSuchFieldException 53 * @throws IllegalAccessException 54 * @throws IllegalArgumentException 55 */56 private static void setBeanProperty(String name, Object value, Object newObj) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {57 Class<?> clz = newObj.getClass();58 Field col = clz.getDeclaredField(name);59 if(!col.isAccessible()){60 // 设置可访问61 col.setAccessible(true);62 }63 col.set(newObj, value);64 }65 66 /**67 * 循环输入 属性 和 值 ，测试的 时候 使用68 * @param newObj69 * @throws IllegalAccessException 70 * @throws IllegalArgumentException 71 */72 private static void loopBeanProperty(Object newObj) throws IllegalArgumentException, IllegalAccessException{73 Class<?> clz = newObj.getClass();74 Field[] cols = clz.getDeclaredFields();75 for(Field col : cols){76 if(!col.isAccessible()){77 // 设置可访问78 col.setAccessible(true);79 }80 System.out.println(col.getName() + "-->" + col.get(newObj));81 }82 }83 84 /**85 * 测试86 * @param args87 */88 public static void main(String[] args) {89 User user = new User(1, "admin", "12345", "135555555555", new Date(), new BigDecimal(20000.88), "土豪");90 try {91 loopBeanProperty(user);92 } catch (IllegalArgumentException e) {93 e.printStackTrace();94 } catch (IllegalAccessException e) {95 e.printStackTrace();96 }97 }98 }
4.各种bean复制方法的比较
1 package com.xsjt.compare; 2 3 import java.math.BigDecimal; 4 import java.util.Date; 5 import org.apache.commons.beanutils.BeanUtils; 6 import com.xsjt.bean.User; 7 import com.xsjt.util.CopyBeanProperty; 8 import net.sf.cglib.beans.BeanCopier; 9 import net.sf.ezmorph.MorpherRegistry;10 import net.sf.ezmorph.bean.BeanMorpher;11 12 /** 13 * ClassName:CompareTest14 * 测试 各种 复制 方法的性能15 * Date: 2017年7月19日 下午5:53:0716 * @author Joe 17 * @version 18 * @since JDK 1.819 */20 public class CompareTest {21 22 public static void main(String[] args) throws Exception {23 24 // 1.使用 apache 的 复制 方法25 User orig = new User(1, "admin", "12345", "135555555555", new Date(), new BigDecimal(20000.88), "土豪");26 User dest = new User();27 long start = System.currentTimeMillis();28 BeanUtils.copyProperties(dest, orig);29 System.out.println("1.apache的方法 花费的时间：" + (System.currentTimeMillis() - start) + "ms");30 System.out.println("dest==" + dest);31 32 System.out.println("--------------------------------我是分割线------------------------------------------------");33 34 // 2.使用 spring 的 复制方法35 User source = new User(1, "admin", "12345", "135555555555", new Date(), new BigDecimal(20000.88), "土豪");36 User target = new User();37 start = System.currentTimeMillis();38 org.springframework.beans.BeanUtils.copyProperties(source, target);39 System.out.println("2.spring的方法 花费的时间：" + (System.currentTimeMillis() - start) + "ms");40 System.out.println("target==" + target);41 42 System.out.println("--------------------------------我是分割线------------------------------------------------");43 44 // 3.使用 cglib 的复制方法45 User source2 = new User(1, "admin", "12345", "135555555555", new Date(), new BigDecimal(20000.88), "土豪");46 User target2 = new User();47 start = System.currentTimeMillis();48 BeanCopier.create(source2.getClass(), target2.getClass(), false).copy(source2, target2, null);49 System.out.println("3.cglib的方法 花费的时间：" + (System.currentTimeMillis() - start) + "ms");50 System.out.println("target2==" + target2);51 52 System.out.println("--------------------------------我是分割线------------------------------------------------");53 54 // 4.使用 EZMorph 的复制方法55 User source3 = new User(1, "admin", "12345", "135555555555", new Date(), new BigDecimal(20000.88), "土豪");56 User target3 = new User();57 start = System.currentTimeMillis();58 MorpherRegistry registry = new MorpherRegistry();59 registry.registerMorpher(new BeanMorpher(User.class, registry));60 target3 = (User) registry.morph(User.class, source3);61 System.out.println("4.EZMorph的方法 花费的时间：" + (System.currentTimeMillis() - start) + "ms");62 System.out.println("target3==" + target3);63 64 System.out.println("--------------------------------我是分割线------------------------------------------------");65 66 // 5.使用 自定义 的复制方法67 User oldUser = new User(1, "admin", "12345", "135555555555", new Date(), new BigDecimal(20000.88), "土豪");68 User newUser = new User();69 start = System.currentTimeMillis();70 CopyBeanProperty.copyproperty(oldUser, newUser);71 System.out.println("5.自定义的方法 花费的时间：" + (System.currentTimeMillis() - start) + "ms");72 System.out.println("newUser==" + newUser);73 }74 }
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
几种Bean的复制方法性能比较
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