什么是代理模式
代理模式就是为一个对象提供一个代理对象，由这个代理对象控制对该对象的访问。
理解代理模式，可以对照生活中的一些具体例子，比如房产中介、二手车交易市场、经纪人等。
为什么要用代理模式
通过使用代理模式，我们避免了直接访问目标对象时可能带来的一些问题，比如：远程调用，需要使用远程代理来帮我们处理一些网络传输相关的细节逻辑；可能需要基于某种权限控制对目标资源的访问，可以使用保护代理等。
总的来说，通过是用代理模式，我们可以控制对目标对象的访问，可以在真实方法被调用前或调用后，通过代理对象加入额外的处理逻辑。
代理模式分类
代理模式分为静态代理和动态代理。动态代理根据实现不同又可细分为JDK动态代理和cglib动态代理。
静态代理是由程序员创建或工具生成代理类的源码，再编译代理类。所谓静态也就是在程序运行前就已经存在代理类的字节码文件，代理类和委托类的关系在运行前就确定了。
动态代理是在实现阶段不用关心代理类，而在运行时动态生成代理类的。
静态代理
以房哥买房子为例，用代码实现静态代理。
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