public class Diy {public void before(){System.out.println("------->在方法执行前");}public void after(){System.out.println("------->在方法执行后");}
}

public interface UserService {void add();void delete();void update();void query();}

public class UserServiceImpl implements UserService{public void add() {System.out.println("增加了一个用户");}public void delete() {System.out.println("删除了一个用户");}public void update() {System.out.println("更新了一个用户");}public void query() {System.out.println("查询了一个用户");}
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsd"><!--注册bean对象-->
<bean id="userService" class="org.west.service.UserServiceImpl"/><bean id="diy" class="org.west.diy.Diy"/><!--编写AOP配置文件--><aop:config><!--切面-->
<aop:aspect ref="diy"><!--切入点--><aop:pointcut id="diyPointCut" expression="execution(* org.west.service.UserServiceImpl.*(..))"/><aop:before method="before" pointcut-ref="diyPointCut"/><aop:after method="after" pointcut-ref="diyPointCut"/>
</aop:aspect></aop:config></beans>

public class TestDemo {@Testpublic void test(){ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");UserService userService = (UserService) context.getBean("userService");userService.add();}}