自定义类实现AOP

首先在pom.xml中导入AOP织入的依赖包

<dependency>
    <groupId>aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.5.3</version>
</dependency>

编写Service层
Service接口

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

ServiceImpl层

public class UserServiceImpl implements UserService {
    @Override
    public void add() {
        System.out.println("增加了一个用户");
    }

    @Override
    public void delete() {
        System.out.println("删除了一个用户");
    }

    @Override
    public void update() {
        System.out.println("修改了一个用户");
    }

    @Override
    public void query() {
        System.out.println("查询了一个用户");
    }
}

编写自定义类

public class DiyPointCut {
    public void before(){
        System.out.println("====方法执行前====");
    }

    public void after(){
        System.out.println("====方法执行后====");
    }
}

编写applicationContext.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns="http://www.springframework.org/schema/beans"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd
">
    <!--注册bean-->
    <bean id="userService" class="com.example.springaopdemo.Service.UserServiceImpl"/>

    <!--方式二：自定义类-->
    <bean id="diy" class="com.example.springaopdemo.diy.DiyPointCut"/>

    <aop:config>
        <!--自定义切面，ref要引用的类-->
        <aop:aspect ref="diy">
            <!--切入点-->
            <aop:pointcut id="point" expression="execution(* com.example.springaopdemo.Service.UserServiceImpl.*(..))"/>

            <!--通知-->
            <aop:before method="before" pointcut-ref="point"/>
            <aop:after method="after" pointcut-ref="point"/>
        </aop:aspect>
    </aop:config>

</beans>

测试文件

import com.example.springaopdemo.Service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author Mi
 * @version 1.0
 * @description: TODO
 * @date 2021/12/15 22:57
 */
public class MyTest {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        //动态代理代理的是接口
        UserService userService = (UserService) context.getBean("userService");
        userService.add();
    }
}

项目截图

运行结果