代码已上传至Github，有兴趣的同学可以下载来看看：https://github.com/ylw-github/Java-DesignMode
外观模式（Facade Pattern）门面模式，隐藏系统的复杂性，并向客户端提供了一个客户端可以访问系统的接口。这种类型的设计模式属于结构型模式，它向现有的系统添加一个接口，来隐藏系统的复杂性。
这种模式涉及到一个单一的类，该类提供了客户端请求的简化方法和对现有系统类方法的委托调用。
下面来举个例子，用户注册完之后，需要调用阿里短信接口、邮件接口、微信推送接口。
1.阿里微信发送消息接口
public interface IAliService { void sendSMS(String msg); } public class AliService implements IAliService { @Override public void sendSMS(String msg) { System.out.println("支付宝发送消息 -> "+msg); } }
2.微信发送消息接口
public interface IWeixinService { void sendSMS(String msg); } public class WeixinService implements IWeixinService { @Override public void sendSMS(String msg) { System.out.println("微信发送信息-> " + msg); } }
3.foxmail发送消息接口
public interface IFoxmailService { void sendSMS(String msg); } public class FoxmailService implements IFoxmailService { @Override public void sendSMS(String msg) { System.out.println("foxmail发送消息 -> " + msg); } }
4.门面类
public class Computer { private IAliService aliService; private IWeixinService weixinService; private IFoxmailService foxmailService; public Computer(){ aliService = new AliService(); weixinService = new WeixinService(); foxmailService = new FoxmailService(); } public void sendGroupMsg(String msg){ aliService.sendSMS(msg); weixinService.sendSMS(msg); foxmailService.sendSMS(msg); } }
5.测试
public class Client { public static void main(String[] args) { Computer computer = new Computer(); computer.sendGroupMsg("明天不用加班..."); } }
总结
