spring 中使用动态代理（注解方式）

客官°小女子只卖身不卖艺 2022-10-08 11:24 212阅读 0赞

上篇文章记录自定义切面，下边记录使用注解来编写自定义切面。

**定义自定义切面 -  diyNodePoint**

package com.lxc.diy;
    
    import org.aspectj.lang.annotation.After;
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Before;
    
    /**
     * @Aspect 标注这个了是一个切面
     * @Before("切入点") === <aop:before method="beforeLog" pointcut-ref="point" />
     * @After("切入点") === <aop:after method="afterLog" pointcut-ref="point" />
     */
    @Aspect
    public class diyNotePoint {
       @Before("execution(* com.lxc.service.UserServiceImp.*(..))")
       public void before() {
           System.out.println("前置切面");
       }
       @After("execution(* com.lxc.service.UserServiceImp.*(..))")
       public void after() {
           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">
        
        
        <bean id="imp" class="com.lxc.service.UserServiceImp"/>
        <bean id="diyNotePoint" class="com.lxc.diy.diyNotePoint" />
        
        <aop:aspectj-autoproxy />
    
    </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：**

![20210621132618780.png][]

[20210621132618780.png]: /images/20221005/46d528318750480ab91faee99e7faa89.png