自定义类实现aop介绍相关代码有什么?

package cn.sxt.test;

import org.springframework.context.ApplicationContext;

public class Test {

public static void main(String[] args){

ApplicationContext ac=new ClassPathXmlApplicationContext("beans.xm1") 

UserService userService=(UserService)ac.getBean("userService"); 

userService.delete();

Log.java

public class Log {

public void before(){

System.out.println("-----方法执行前-----")

public void after(){

System.out.println(-----方法执行后-----”);

}

}