注解方式实现aop:切点表达式的抽取

目标接口和目标类

package com.itliu.anno;

public interface TargetInterface {

    public void save();
}

package com.itliu.anno;

import org.springframework.stereotype.Component;

@Component("target")
public class Target implements TargetInterface {
    public void save() {
        System.out.println("打印Target");
    }
}

切面类

package com.itliu.anno;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;

@Component("myAespect")
@Aspect//标注当前类是一个切面
public class MyAespect {

//    定义切点表达式
    @Pointcut("execution(public void com.itliu.anno.Target.*(..))")
    public void pointcut(){}

    //    配置前置通知
    @Before("pointcut()")
    public void before() {
        System.out.println("前置增强");
    }

    //    配置后置通知
    @After("pointcut()")
    public void after() {
        System.out.println("后置增强");
    }

    //    配置环绕通知
    @Around("pointcut()")
    public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
        System.out.println("环绕前增强");
        Object proceed = joinPoint.proceed();//切点方法
        System.out.println("环绕后增强");
        return proceed;
    }

}

配置文件

<?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:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

    <!--    组件扫描-->
    <context:component-scan base-package="com.itliu.anno"></context:component-scan>

    <!--AOP自动代理-->
    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
    
</beans>