JDK动态代理（简单代码）

public static void main( string[] args ){

        final Target target =new Target(;//生成了一个代理类对象proxy
        TargetInterface proxy =(TargetInterface)Proxy.newProxyInstance(

                target.getcass(.getclassLoader,//第一个参数被代理类的类加载器
                target.getclass.getInterfaces,//第二个参数target的所以实现接口

                //第三参数是InvocationHandler
                new InvocationHandler(){public object invoke(object proxy, Method method, object[] args)throws Throwable {
                        System.out.printin("前面增强”;
                        object invoke = method.invoke(target, args),
                        system.out.printin("后置增强”;
                        return invoke;

                }

        })；

proxy.say();

}