1 bean-copy 的性能问题

1 问题

bean 拷贝一直依赖是一个简单问题 ，最近忽然发现了其实创建在赋值性能收到了大量问题 ，这时候回想一下就是C 语言里面有一个memcpy
，那么肯定有一群脑子有轴的人说这不行，我也要换个语言再来一遍

    <dependencies>

        <dependency>
            <groupId>asm</groupId>
            <artifactId>asm</artifactId>
            <version>3.3.1</version>
        </dependency>
        <dependency>
            <groupId>asm</groupId>
            <artifactId>asm-commons</artifactId>
            <version>3.3.1</version>
        </dependency>
        <dependency>
            <groupId>asm</groupId>
            <artifactId>asm-util</artifactId>
            <version>3.3.1</version>
        </dependency>
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib-nodep</artifactId>
            <version>2.2.2</version>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>29.0-jre</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.6</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.3.13.RELEASE</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>3.2.0.RELEASE</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>commons-beanutils</groupId>
            <artifactId>commons-beanutils</artifactId>
            <version>1.9.3</version>
        </dependency> 
    </dependencies>
</project>  

• 测试代码

package common;
import net.sf.cglib.beans.BeanCopier;
import org.apache.commons.beanutils.PropertyUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.util.StopWatch;
import java.lang.reflect.InvocationTargetException;
import java.util.Date;
/**
 * @author lianzheng04
 * @version 1.0
 * @date 2020/8/6 7:27 下午
 */
public class TestCopy {
    private void mappingBySpringBeanUtils(PersonDO personDO, int times) {
        StopWatch stopwatch = new StopWatch();
        stopwatch.start();

        for (int i = 0; i < times; i++) {
            PersonDTO personDTO = new PersonDTO();
            org.springframework.beans.BeanUtils.copyProperties(personDO, personDTO);
        }
        stopwatch.stop();
        System.out.println("mappingBySpringBeanUtils cost :" + stopwatch.getTotalTimeMillis());
    }
    private void mappingByCglibBeanCopier(PersonDO personDO, int times) {
        StopWatch stopwatch = new StopWatch();
        stopwatch.start();
        for (int i = 0; i < times; i++) {
            PersonDTO personDTO = new PersonDTO();
            BeanCopier copier = BeanCopier.create(PersonDO.class, PersonDTO.class, false);
            copier.copy(personDO, personDTO, null);
        }
        stopwatch.stop();
        System.out.println("mappingByCglibBeanCopier cost :" + stopwatch.getTotalTimeMillis());
    }
    private void mappingByApacheBeanUtils(PersonDO personDO, int times)
            throws InvocationTargetException, IllegalAccessException {
        StopWatch stopwatch = new StopWatch();
        stopwatch.start();
        for (int i = 0; i < times; i++) {
            PersonDTO personDTO = new PersonDTO();
            BeanUtils.copyProperties(personDTO, personDO);
        }
        stopwatch.stop();
        System.out.println("mappingByApacheBeanUtils cost :" + stopwatch.getTotalTimeMillis());
    }
    private void mappingByApachePropertyUtils(PersonDO personDO, int times)
            throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {
        StopWatch stopwatch = new StopWatch();
        stopwatch.start();
        for (int i = 0; i < times; i++) {
            PersonDTO personDTO = new PersonDTO();
            PropertyUtils.copyProperties(personDTO, personDO);
        }
        stopwatch.stop();
        System.out.println("mappingByApachePropertyUtils cost :" + stopwatch.getTotalTimeMillis());
    }
    public static void main(String[] args)
            throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {
        PersonDO personDO = new PersonDO();
        personDO.setName("Hollis");
        personDO.setAge(26);
        personDO.setBirthday(new Date());
        personDO.setId(1);
        TestCopy mapperTest = new TestCopy();

        mapperTest.mappingBySpringBeanUtils(personDO, 100);
        mapperTest.mappingBySpringBeanUtils(personDO, 1000);
        mapperTest.mappingBySpringBeanUtils(personDO, 10000);
        mapperTest.mappingBySpringBeanUtils(personDO, 100000);
        mapperTest.mappingBySpringBeanUtils(personDO, 1000000);
        mapperTest.mappingByCglibBeanCopier(personDO, 100);
        mapperTest.mappingByCglibBeanCopier(personDO, 1000);
        mapperTest.mappingByCglibBeanCopier(personDO, 10000);
        mapperTest.mappingByCglibBeanCopier(personDO, 100000);
        mapperTest.mappingByCglibBeanCopier(personDO, 1000000);
        mapperTest.mappingByApachePropertyUtils(personDO, 100);
        mapperTest.mappingByApachePropertyUtils(personDO, 1000);
        mapperTest.mappingByApachePropertyUtils(personDO, 10000);
        mapperTest.mappingByApachePropertyUtils(personDO, 100000);
        mapperTest.mappingByApachePropertyUtils(personDO, 1000000);
        mapperTest.mappingByApacheBeanUtils(personDO, 100);
        mapperTest.mappingByApacheBeanUtils(personDO, 1000);
        mapperTest.mappingByApacheBeanUtils(personDO, 10000);
        mapperTest.mappingByApacheBeanUtils(personDO, 100000);
        mapperTest.mappingByApacheBeanUtils(personDO, 1000000);
    }
}

• 最后可见
  四种工具 apache 最慢 ，所以你懂的 以后springUtils 和 cglib 爱了爱了