上边文章记录Spring中使用动态代理，切面我们是 重写了 AfterReturningAdvice 接口和MethodBeforeAdvice 接口中的方法，下边记录自定义切面，我们自定义的切面不能控制目标类、方法，局限性很大：

定义自定义切面 -  diyPoint

package com.lxc.diy;

public class diyPoint {
    public void beforeLog() {
        System.out.println("前置切面");
    }
    public void afterLog() {
        System.out.println("后置切面");
    }
}

定义接口 - UserService

package com.lxc.service;

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

重写接口类 - UserServiceImp

package com.lxc.service;
public class UserServiceImp implements UserService{
    @Override
    public void query() {
        System.out.println("query");
    }
    @Override
    public void delete() {
        System.out.println("delete");
    }
    @Override
    public void edit() {
        System.out.println("edit");
    }
    @Override
    public void add() {
        System.out.println("add");
    }
}

beans.xml中配置：

<?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"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">
    
    <!--定义bean-->
    <bean id="diyPoint" class="com.lxc.diy.diyPoint"/>
    <bean id="imp" class="com.lxc.service.UserServiceImp"/>
    <aop:config>
         <!-- <aop:aspect /> 引用上边的 自定义切面，
              ref：要引用的类 -->
        <aop:aspect ref="diyPoint">
            <!--切入点-->
            <aop:pointcut id="point" expression="execution(* com.lxc.service.UserServiceImp.*(..))" />
            <!--通知什么时间执行-->
            <aop:before method="beforeLog" pointcut-ref="point" />
            <aop:after method="afterLog" pointcut-ref="point" />
        </aop:aspect>
    </aop:config>

</beans>

测试：

import com.lxc.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {
    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
        UserService userService = ctx.getBean("imp", UserService.class);
        userService.add();
    }
}

 输出如下：