Java：动态代理，InvocationHandler接口

简介

Java动态代理的核心是一个接口InvocationHandler和一个类Proxy。其中InvocationHandler接口是proxy代理实例的调用处理程序实现的一个接口，每一个proxy代理实例都有一个关联的调用处理程序；在代理实例调用方法时，方法调用被编码分派到调用处理程序的invoke方法。

官方对InvocationHandler接口的描述

     {@code InvocationHandler} is the interface implemented by
     the invocation handler of a proxy instance.

     
Each proxy instance has an associated invocation handler.
     When a method is invoked on a proxy instance, the method
     invocation is encoded and dispatched to the {@code invoke}
     method of its invocation handler.