Java Bean 属性复制的几种框架比较

Java开发都避免不了和各种Bean打交道，包括POJO、BO、VO、PO、DTO等，而Java的应用非常讲究分层的架构，因此就会存在对象在各个层次之间作为参数或者输出传递的过程，这里转换的工作往往非常繁琐。

为此业界有很多开源的解决方案，列出一些常见的如下：

• Apache org.apache.commons.beanutils.PropertyUtils.copyProperties
• Apache org.apache.commons.beanutils.BeanUtils.copyProperties
• Spring org.springframework.beans.BeanUtils.copyProperties
• Cglib BeanCopier
• Dozer

性能测试

1、maven依赖

    commons-beanutils
    commons-beanutils
    1.9.3



    org.springframework
    spring-beans
    4.3.6.RELEASE



    cglib
    cglib
    3.2.5



    net.sf.dozer
    dozer
    5.5.1

测试代码：

package com.bytebeats.bean.copy;

import com.bytebeats.bean.copy.model.Address;
import com.bytebeats.bean.copy.model.Customer;
import com.bytebeats.bean.copy.model.Employee;
import net.sf.cglib.beans.BeanCopier;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.PropertyUtils;

import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;

/**
 * Hello world!
 *
 */
public class BeanCopyDemo {

    private int count = 100000;

    public static void main( String[] args ) throws Exception {

        new BeanCopyDemo().testTime("ApacheBeanUtils");
    }

    public void testTime(String name) throws Exception {
        Customer customer = getCustomer();
        Employee employee = new Employee();

        long start = System.currentTimeMillis();
        switch (name){
            case "ApacheBeanUtils":
                testApacheBeanUtils(customer, employee);
                break;
            case "ApachePropertyUtils":
                testApachePropertyUtils(customer, employee);
                break;
            case "SpringBeanUtils":
                testSpringBeanUtils(customer, employee);
                break;
            case "CglibBeanCopier":
                testCglibBeanCopier(customer, employee);
                break;
        }

        System.out.println(name+" count: "+count+" cost: "+(System.currentTimeMillis() - start)+" ms");
    }

    public void testCglibBeanCopier(Object src, Object target){

        BeanCopier copier = BeanCopier.create(src.getClass(), target.getClass(), false);
        copier.copy(src, target, null);
    }

    public void testSpringBeanUtils(Object src, Object target){
        for(int i=0; i hobbies = new ArrayList<>(4);
        hobbies.add("汽车");
        hobbies.add("旅游");
        hobbies.add("体育");
        hobbies.add("NBA");
        customer.setHobbies(hobbies);

        Address address = new Address();
        address.setProvince("湖北省");
        address.setCity("武汉市");
        address.setDistrict("武昌区");
        address.setDetail("欢乐大道28号");
        customer.setAddress(address);

        return customer;
    }
}

分别测试10万次拷贝，耗时如下：

表1

框架	耗时
org.apache.commons.beanutils.BeanUtils.copyProperties	1804 ms
org.apache.commons.beanutils.PropertyUtils.copyProperties	1171 ms
org.springframework.beans.BeanUtils.copyProperties	770 ms
net.sf.cglib.beans.BeanCopier.copy	147 ms

小结

总体来说，cglib BeanCopier效率最高，spring-beans 次之，BeanUtils 效果不太理想。