动态代理入门

public class ProxyFactory {
    public static  Object getAgent(Service target,Aop aop)
    {
            return Proxy.newProxyInstance(
                    //类加载器
                    target.getClass().getClassLoader(),
                    //目标对象实现的所有接口
                    target.getClass().getInterfaces(),
                    //代理功能的实现
                    new InvocationHandler() {
                        @Override
                        public Object invoke(
                                //生成的代理对象
                                Object proxy,
                                //正在调用的目标方法
                                Method method,
                                //目标方法的参数
                                Object[] args
                        ) throws Throwable {
                            aop.before();
                            Object invoke = method.invoke(target,args);
                            aop.afeart();
                            return invoke;
                        }
                    }
            );
    }
}

public interface Aop {
    default  void before(){};
    default  void afeart(){};
    default  void end(){};

}

public class logAop implements  Aop{
    @Override
    public void before() {
        System.out.println("日志开启");
        Aop.super.before();
    }
}

public class TranAop implements  Aop{
    @Override
    public void before() {
        System.out.println("事物开启");
        Aop.super.before();
    }

    @Override
    public void afeart() {
        System.out.println("事物进行");
        Aop.super.afeart();
    }

    @Override
    public void end() {
        System.out.println("事物关闭");
        Aop.super.end();
    }
}

public interface Service {
    void buy();
}

public class buyBook implements Service {

    @Override
    public void buy() {
        System.out.println("buy BOOK");
    }
}

public class buyShop implements Service {

    @Override
    public void buy() {
        System.out.println("buy shop");
    }
}