java 动态代理

spring aop 用到动态代理

 

public interface Animal {

     void say();
}

public class Person implements Animal {
 
    @Override
    public void say() {
        System.out.println("=====hello");
    }
}

public class PersionProxy implements InvocationHandler {

    private Person person;

    public PersionProxy(Person person){
        this.person = person;
    }
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("test proxy");
        System.out.println("method:"+method);
        method.invoke(person);
        System.out.println("end====");
        return null;
    }
}

public class Main {

    public static void main(String[] args) {

            Person person = new Person();
            PersionProxy handler = new PersionProxy(person);
            Animal animal = (Animal) Proxy.newProxyInstance(Person.class.getClassLoader(), new Class[]        {Animal.class}, handler);
            animal.say();
    }
}