Detailed explanation of three methods of object attribute copying

Three methods of copying object properties:

1. BeanUtil.copyProperties and PropertyUtil.copyProperties two methods provided by Apache

BeanUtils.copyProperties("Converted class ", "Class to be converted"); //One more step of type conversion, even less efficient than PropertyUtils

　PropertyUtils.copyProperties( "Converted class", "Class to be converted");

## Tip: Pay later (pay later) Front: copy the latter to the front) will throw an exception

2. BeanUtil.copyProperties method provided by spring

BeanUtils.copyProperties(

"Class to be converted ", "Converted class");

Reverse the order of Apache parameters

3. The copy method provided by cglib

BeanCopier copy=BeanCopier.create("Class to be converted"

, "Converted class", false);

copy.copy(from, to,

null);##4. The copy method provided by spring

BeanCopier copy=BeanCopier. create("Class to be converted"

, "Converted class"

, false); copy.copy(from, to ,

null);

1 /**2  * Created by hunt on 2017/6/28.3  */4 @Data5 public class TestFrom {6     private String name;7 }

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1 import lombok.Data;2 3 /**4  * Created by hunt on 2017/6/28.5  */6 @Data7 public class TestTo {8     private String name;9 }

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BeanUtils efficiency test of the first Apache method:

 1 import org.apache.commons.beanutils.BeanUtils; 2  3 import java.lang.reflect.InvocationTargetException; 4  5 /** 6  * Created by hunt on 2017/6/28. 7  */ 8 public class TestDemo { 9     public static void main(String[] args) throws InvocationTargetException, IllegalAccessException {10         TestFrom testFrom = new TestFrom();11         testFrom.setName("hunt");12         TestTo testTo = new TestTo();13         long begin = System.currentTimeMillis();14         for (int i = 0; i <1000000 ; i++) {//一百万次15             BeanUtils.copyProperties(testTo,testFrom);16         }17         long end = System.currentTimeMillis();18         long mis = end -begin;19         System.out.println("apache的BeanUtils.copyProperties耗时" + mis +"毫秒");20         System.out.println(testTo);21     }22 }

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PropertyUtils efficiency test of the first Apache method:

 1 import org.apache.commons.beanutils.PropertyUtils; 2  3 import java.lang.reflect.InvocationTargetException; 4  5 /** 6  * Created by hunt on 2017/6/28. 7  */ 8 public class TestDemo { 9     public static void main(String[] args) throws IllegalAccessException, NoSuchMethodException, InvocationTargetException {10         TestFrom testFrom = new TestFrom();11         testFrom.setName("hunt");12         TestTo testTo = new TestTo();13         long begin = System.currentTimeMillis();14         for (int i = 0; i <1000000 ; i++) {//一百万次15             PropertyUtils.copyProperties(testTo,testFrom);16         }17         long end = System.currentTimeMillis();18         long mis = end -begin;19         System.out.println("apache的PropertyUtils.copyProperties耗时" + mis +"毫秒");20         System.out.println(testTo);21     }22 }

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##The second Spring method of BeanUtils efficiency test:

 1 import org.springframework.beans.BeanUtils; 2  3 /** 4  * Created by hunt on 2017/6/28. 5  */ 6 public class TestDemo { 7     public static void main(String[] args) { 8         TestFrom testFrom = new TestFrom(); 9         testFrom.setName("hunt");10         TestTo testTo = new TestTo();11         long begin = System.currentTimeMillis();12         for (int i = 0; i <1000000 ; i++) {//一百万次13             BeanUtils.copyProperties(testFrom,testTo);//没抛异常14         }15         long end = System.currentTimeMillis();16         long mis = end -begin;17         System.out.println("Spring的PropertyUtils.copyProperties耗时" + mis +"毫秒");18         System.out.println(testTo);19     }20 }

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第三种方式cglib的copy效率测试

 1 import net.sf.cglib.beans.BeanCopier; 2  3 /** 4  * Created by hunt on 2017/6/28. 5  */ 6 public class TestDemo { 7     public static void main(String[] args) { 8         TestFrom testFrom = new TestFrom(); 9         testFrom.setName("hunt");10         TestTo testTo = new TestTo();11         long begin = System.currentTimeMillis();12         for (int i = 0; i <1000000 ; i++) {//一百万次13             BeanCopier copier = BeanCopier.create(TestFrom.class,TestTo.class,false);14             copier.copy(testFrom,testTo,null);15         }16         long end = System.currentTimeMillis();17         long mis = end -begin;18         System.out.println("cglib的copier.copy耗时" + mis +"毫秒");19         System.out.println(testTo);20     }21 }

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第四种方式Spring的copy效率测试

 1 import org.springframework.cglib.beans.BeanCopier; 2  3 /** 4  * Created by hunt on 2017/6/28. 5  */ 6 public class TestDemo { 7     public static void main(String[] args) { 8         TestFrom testFrom = new TestFrom(); 9         testFrom.setName("hunt");10         TestTo testTo = new TestTo();11         long begin = System.currentTimeMillis();12         for (int i = 0; i <1000000 ; i++) {//一百万次13             BeanCopier copier = BeanCopier.create(TestFrom.class,TestTo.class,false);14             copier.copy(testFrom,testTo,null);15         }16         long end = System.currentTimeMillis();17         long mis = end -begin;18         System.out.println("Spring的copier.copy耗时" + mis +"毫秒");19         System.out.println(testTo);20     }21 }

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总结：这四种方式的效率是由低到高。（注意Apache的PropertyUtils不能进行类型转换的问题）

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