对象属性复制几种方式的效率

对象属性复制的三种方法：

1.Apache提供的BeanUtil.copyProperties和PropertyUtil.copyProperties两种方式

　　BeanUtils.copyProperties("转换后的类", "要转换的类"); //多一步类型转换，比PropertyUtils效率还差

　　PropertyUtils.copyProperties("转换后的类", "要转换的类");

　　口诀：后付钱（后付前:后面的复制给前面）会抛异常

2.spring提供的BeanUtil.copyProperties方式

　　BeanUtils.copyProperties("要转换的类", "转换后的类"); 

　　和Apache参数顺序相反

3.cglib提供的copy方式

　　BeanCopier copy=BeanCopier.create("要转换的类", "转换后的类", false);

　　copy.copy(from, to, null);

4.spring提供的copy方式

　　BeanCopier copy=BeanCopier.create("要转换的类", "转换后的类", false);

　　copy.copy(from, to, null);

 

/**
 * Created by hunt on 2017/6/28.
 */
@Data
public class TestFrom {
    private String name;
}

 

import lombok.Data;

/**
 * Created by hunt on 2017/6/28.
 */
@Data
public class TestTo {
    private String name;
}

第一种Apache方式的BeanUtils效率测试：

import org.apache.commons.beanutils.BeanUtils;

import java.lang.reflect.InvocationTargetException;

/**
 * Created by hunt on 2017/6/28.
 */
public class TestDemo {
    public static void main(String[] args) throws InvocationTargetException, IllegalAccessException {
        TestFrom testFrom = new TestFrom();
        testFrom.setName("hunt");
        TestTo testTo = new TestTo();
        long begin = System.currentTimeMillis();
        for (int i = 0; i <1000000 ; i++) {//一百万次
            BeanUtils.copyProperties(testTo,testFrom);
        }
        long end = System.currentTimeMillis();
        long mis = end -begin;
        System.out.println("apache的BeanUtils.copyProperties耗时" + mis +"毫秒");
        System.out.println(testTo);
    }
}

第一种Apache方式的PropertyUtils效率测试：

import org.apache.commons.beanutils.PropertyUtils;

import java.lang.reflect.InvocationTargetException;

/**
 * Created by hunt on 2017/6/28.
 */
public class TestDemo {
    public static void main(String[] args) throws IllegalAccessException, NoSuchMethodException, InvocationTargetException {
        TestFrom testFrom = new TestFrom();
        testFrom.setName("hunt");
        TestTo testTo = new TestTo();
        long begin = System.currentTimeMillis();
        for (int i = 0; i <1000000 ; i++) {//一百万次
            PropertyUtils.copyProperties(testTo,testFrom);
        }
        long end = System.currentTimeMillis();
        long mis = end -begin;
        System.out.println("apache的PropertyUtils.copyProperties耗时" + mis +"毫秒");
        System.out.println(testTo);
    }
}

第二种Spring方式的BeanUtils效率测试：

import org.springframework.beans.BeanUtils;

/**
 * Created by hunt on 2017/6/28.
 */
public class TestDemo {
    public static void main(String[] args) {
        TestFrom testFrom = new TestFrom();
        testFrom.setName("hunt");
        TestTo testTo = new TestTo();
        long begin = System.currentTimeMillis();
        for (int i = 0; i <1000000 ; i++) {//一百万次
            BeanUtils.copyProperties(testFrom,testTo);//没抛异常
        }
        long end = System.currentTimeMillis();
        long mis = end -begin;
        System.out.println("Spring的PropertyUtils.copyProperties耗时" + mis +"毫秒");
        System.out.println(testTo);
    }
}

第三种方式cglib的copy效率测试

import net.sf.cglib.beans.BeanCopier;

/**
 * Created by hunt on 2017/6/28.
 */
public class TestDemo {
    public static void main(String[] args) {
        TestFrom testFrom = new TestFrom();
        testFrom.setName("hunt");
        TestTo testTo = new TestTo();
        long begin = System.currentTimeMillis();
        for (int i = 0; i <1000000 ; i++) {//一百万次
            BeanCopier copier = BeanCopier.create(TestFrom.class,TestTo.class,false);
            copier.copy(testFrom,testTo,null);
        }
        long end = System.currentTimeMillis();
        long mis = end -begin;
        System.out.println("cglib的copier.copy耗时" + mis +"毫秒");
        System.out.println(testTo);
    }
}

第四种方式Spring的copy效率测试

import org.springframework.cglib.beans.BeanCopier;

/**
 * Created by hunt on 2017/6/28.
 */
public class TestDemo {
    public static void main(String[] args) {
        TestFrom testFrom = new TestFrom();
        testFrom.setName("hunt");
        TestTo testTo = new TestTo();
        long begin = System.currentTimeMillis();
        for (int i = 0; i <1000000 ; i++) {//一百万次
            BeanCopier copier = BeanCopier.create(TestFrom.class,TestTo.class,false);
            copier.copy(testFrom,testTo,null);
        }
        long end = System.currentTimeMillis();
        long mis = end -begin;
        System.out.println("Spring的copier.copy耗时" + mis +"毫秒");
        System.out.println(testTo);
    }
}

 

 

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）