（行为型模式九）备忘录模式

来源：互联网发布：安知玉如意说的是什么编辑：程序博客网时间：2024/06/06 16:26
package com.eyugame.modle;import java.beans.BeanInfo;import java.beans.Introspector;import java.beans.PropertyDescriptor;import java.lang.reflect.Method;import java.util.HashMap;import java.util.Map;/** * 备忘录模式 * @author JYC506 * *//*备份类*/public class Memento {Map<String, Map<String,Object>> map = new HashMap<String, Map<String,Object>>();public void put(String key,Map<String,Object> proMap){this.map.put(key, proMap);}public void restoreBean(Object bean,String key){BeanUtil.restoreBean(bean, map.get(key));}public static void main(String[] args) {Phone phone=new Phone("小米note",2300,"白色");System.out.println("没修改前的："+phone);/*备份*/Memento memento=new Memento();memento.put("01", BeanUtil.toMap(phone));/*修改*/phone.setColor("黑色");phone.setPrice(1999);System.out.println("修改后："+phone);    /*回滚*/memento.restoreBean(phone, "01");System.out.println("回滚后："+phone);}}class BeanUtil {/* 把对象的属性存贮起来 */public static Map<String, Object> toMap(Object bean) {Map<String, Object> map = new HashMap<String, Object>();try {BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass());PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();for (PropertyDescriptor pd : propertyDescriptors) {String name = pd.getName();Method method = pd.getReadMethod();if(!name.equalsIgnoreCase("class")){Object value = method.invoke(bean, new Object[] {});map.put(name, value);}}} catch (Exception e) {e.printStackTrace();}return map;}/* 根据对象属性存贮库恢复对象属性 */public static void restoreBean(Object bean, Map<String, Object> proMap) {try {BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass());PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();for (PropertyDescriptor pd : propertyDescriptors) {String name = pd.getName();Method method = pd.getWriteMethod();if(!name.equalsIgnoreCase("class")){    method.invoke(bean, proMap.get(name));}}} catch (Exception e) {e.printStackTrace();}}}/*手机*/class Phone {private String name;private double price;private String color;public Phone(String name, double price, String color) {super();this.name = name;this.price = price;this.color = color;}@Overridepublic String toString() {return "名称:"+this.name+"  价格:"+this.price+" 颜色:"+this.color;}public String getName() {return name;}public void setName(String name) {this.name = name;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public String getColor() {return color;}public void setColor(String color) {this.color = color;}}
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