Bean熟悉替换，只替换部分属性，其他属性值不改变

需要加入：asm.jar cglib-2.1.jar，用来map和bean之间的转换(比spring和反射的效率好，因为加入了缓存)

package com.bean.test;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import net.sf.cglib.beans.BeanMap;

public class CopyBean {

    /**

     * @param args

     */

    public static void main(String[] args) {

        User u1 = new User();

        u1.setId(1);

        u1.setName("用户1");

        u1.setPwd("12333");

        u1.setAddress("杭州西湖区");

        GirlFriend girl11 = new GirlFriend("范冰冰");

        GirlFriend girl12 = new GirlFriend("林心如");

        List<GirlFriend> list1 = new ArrayList<GirlFriend>();

        list1.add(girl11);

        list1.add(girl12);

        u1.setGirls(list1);

        User u2 = new User();

        u2.setName("【用户222】");

        u2.setAddress("【-甘肃省兰州市-】");

        GirlFriend girl21 = new GirlFriend("【赵雅芝】");

        GirlFriend girl22 = new GirlFriend("【张柏芝】");

        GirlFriend girl32 = new GirlFriend("【汤唯】");

        List<GirlFriend> list2 = new ArrayList<GirlFriend>();

        list2.add(girl21);

        list2.add(girl22);

        list2.add(girl32);

        u2.setGirls(list2);

        copyBean(u1, u2);

        System.out.println("拷贝后："+u1);

    }
}

拷贝的方法：

/**

     * 将对象中需要改变的属性值 拷贝到目标对象中，替换目标对象中的部分属性值

     *

     * @param fromBean 要改变的对象

     * @param targetBean 目标对象

     */

    public static void copyBean(Object fromBean, Object targetBean) {

        Map<String, Object> fromMap = beanToMap(fromBean);

        Map<String, Object> toMap = beanToMap(targetBean);

        for (String key : fromMap.keySet()) {

            if (fromMap.get(key) == null) {

                continue;

            }

            //将fromMap的值设置到toMap中

            toMap.put(key, fromMap.get(key));

        }

        //转换map为bean

        mapToBean(toMap, targetBean);

    }

    /**

     * 将对象装换为map

     *

     * @param bean

     * @return

     */

    public static Map<String, Object> beanToMap(Object bean) {

        Map<String, Object> map = new HashMap<String, Object>();

        if (bean != null) {

            BeanMap beanMap = BeanMap.create(bean);

            for (Object key : beanMap.keySet()) {

                map.put(key + "", beanMap.get(key));

            }

        }

        return map;

    }

    /**

     * 将map装换为javabean对象

     *

     * @param map

     * @param bean

     * @return

     */

    public static void mapToBean(Map<String, Object> map, Object bean) {

        BeanMap beanMap = BeanMap.create(bean);

        beanMap.putAll(map);

    }

结果：

from:{id=0, girls=[GirlFriend [name=【赵雅芝】], GirlFriend [name=【张柏芝】], GirlFriend [name=【汤唯】]], pwd=null, address=【-甘肃省兰州市-】, name=【用户222】}

to:{id=1, girls=[GirlFriend [name=范冰冰], GirlFriend [name=林心如]], pwd=12333, address=杭州西湖区, name=用户1}

拷贝后：User [编号=1, 姓名=【用户222】, 密码=12333, 地址=【-甘肃省兰州市-】, 女朋友=[GirlFriend [name=【赵雅芝】], GirlFriend [name=【张柏芝】], GirlFriend [name=【汤唯】]]]

巴特西

Bean熟悉替换，只替换部分属性，其他属性值不改变

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