spring5框架尚硅谷学习笔记（三）

//创建接口代理对象
public class JDKProxy {
    public static void main(String[] args) {
        Class[] interfaces = {UserDao.class};
//        //1.使用匿名内部类
//        Proxy.newProxyInstance(JDKProxy.class.getClassLoader(), interfaces,
//        new InvocationHandler() {
//             public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
//                    return null;
//             }
//        });
        UserDaoImpl userDao = new UserDaoImpl();
        UserDao o =(UserDao) Proxy.newProxyInstance(JDKProxy.class.getClassLoader(), interfaces, new UserDaoProxy(userDao));
        int add = o.add(1, 2);
        System.out.println("result:"+add);
    }
}

class UserDaoProxy implements InvocationHandler{

    private Object obj;
    public UserDaoProxy(Object obj){
        this.obj=obj;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("方法执行之前执行："+method.getName()+"参数："+ Arrays.toString(args));
        //被增强的方法执行
        Object invoke = method.invoke(obj, args);
        System.out.println("方法执行之后执行："+obj);
        return invoke;
    }
}