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】]]]