动态代理与spring AOP

给出一个简单的例子

定义了一个类

package com.xiaoqiang.user;

public class User {
	public void add(){
		System.out.println("this is a method");
	}
}

定义了一个拦截器此时拦截器必须要实现MethodInterceptor接口

package com.xiaoqiang.interceptor;

import java.lang.reflect.Method;

import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

public class Interceptor implements MethodInterceptor {

	@Override

         //当调用User的方法的时候拦截器方法将会首先执行
	public Object intercept(Object arg0, Method arg1, Object[] arg2,
			MethodProxy proxy) throws Throwable {
		System.out.println("xiaoqiang0");   
	    proxy.invokeSuper(arg0, arg2);  //调用被动态代理的对象的方法
	    System.out.println("xiaoqiang");
	    return null;
	}

}

 

package com.xiaoqiang.test;

import net.sf.cglib.proxy.Enhancer;

import com.xiaoqiang.interceptor.Interceptor;
import com.xiaoqiang.user.User;

public class ReflectionTest {

	public static void main(String[] args) {
		Enhancer enhancer = new Enhancer();
		enhancer.setSuperclass(User.class);
		enhancer.setCallback(new Interceptor());
		User user =(User) enhancer.create();
		user.add();
	}
}