自定义切面

亦凉 2022-10-08 11:18 48阅读 0赞

上篇文章记录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">
        
        
        <bean id="diyPoint" class="com.lxc.diy.diyPoint"/>
        <bean id="imp" class="com.lxc.service.UserServiceImp"/>
        <aop:config>
             
            <aop:aspect ref="diyPoint">
                
                <aop:pointcut id="point" expression="execution(* com.lxc.service.UserServiceImp.*(..))" />
                
                <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：**

![20210621114535159.png][]

[20210621114535159.png]: /images/20221005/955b8e193b1f4822a50a7cd65d0e5bd1.png