Spring-AOP @AspectJ进阶之切点复合运算

概述

@AspectJ可以使用切点函数定义切点，还可以使用逻辑运算符对切点进行复合运算得到复合切点。

为了在切面中重用切点，还可以对切点进行命名，以便在其他地方引用定义过的切点。

当一个连接点匹配多个切点时，需要考虑织入顺序的问题，另外一个重要的问题是如何在增强中访问连接点上下文的信息。

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示例

代码已托管到Github—> https://github.com/yangshangwei/SpringMaster

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这里仅仅展示关键代码

切面部分：

package com.xgj.aop.spring.advisor.aspectJAdvance.pointcutComplex;

import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

/**
 * 
 * 
 * @ClassName: PointcutComplexAspect
 * 
 * @Description: 标注了@Aspect的切面
 * 
 * @author: Mr.Yang
 * 
 * @date: 2017年9月9日 上午1:50:45
 */

@Aspect
public class PointcutComplexAspect {

    /**
     * 
     * 
     * @Title: matchGreetTo
     * 
     * @Description: 与预算,匹配com.xgj.aop.spring.advisor.aspectJAdvance.
     *               pointcutComplex包中所有greetTo()方法的切点
     * 
     * 
     * @return: void
     */
    @Before("within(com.xgj.aop.spring.advisor.aspectJAdvance.pointcutComplex.*)"
            + " && execution(* greetTo(..))")
    public void matchGreetTo() {
        System.out.println("matchGreetTo executed,some logic is here ");
    }

    /**
     * 
     * 
     * @Title: something
     * 
     * @Description: 非与预算，匹配所有的serverTo方法,且不位于WaiterOne目标类切点
     * 
     * 
     * @return: void
     */

    @After("!target(com.xgj.aop.spring.advisor.aspectJAdvance.pointcutComplex.WaiterOne)"
            + " && execution(* serverTo(..))")
    public void something() {
        System.out.println("something executed,some logic is here ");
    }

    /**
     * 
     * 
     * @Title: method
     * 
     * @Description: 或运算，匹配IWaiter和ISeller接口实现类所有连接点的切点
     * 
     * 
     * @return: void
     */

    @AfterReturning("target(com.xgj.aop.spring.advisor.aspectJAdvance.pointcutComplex.IWaiter)"
            + " || target(com.xgj.aop.spring.advisor.aspectJAdvance.pointcutComplex.ISeller)")
    public void method() {
        System.out.println("method executed,some logic is here ");
    }

}

配置文件，Bean的初始化使用context:component-scan扫描

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd">

<!-- (1)声明Context命名空间以及Schema文件   (2)扫描类包以及应用注解定义的bean -->
<context:component-scan base-package="com.xgj.aop.spring.advisor.aspectJAdvance.pointcutComplex"/>

<!-- 基于@AspectJ切面的驱动器 -->
<aop:aspectj-autoproxy proxy-target-class="true"/>

<!-- 使用了@AspectJ注解的切面类 -->
<bean class="com.xgj.aop.spring.advisor.aspectJAdvance.pointcutComplex.PointcutComplexAspect"/>

</beans>

测试类：

package com.xgj.aop.spring.advisor.aspectJAdvance.pointcutComplex;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class PointcutComplexAspectTest {

    @Test
    public void test() {
        ApplicationContext ctx = new ClassPathXmlApplicationContext(
                "com/xgj/aop/spring/advisor/aspectJAdvance/pointcutComplex/conf-pointcutComplex.xml");

        WaiterOne waiterOne = ctx.getBean("waiterOne", WaiterOne.class);
        WaiterTwo waiterTwo = ctx.getBean("waiterTwo", WaiterTwo.class);

        SellerOne sellerOne = ctx.getBean("sellerOne", SellerOne.class);
        SellerTwo sellerTwo = ctx.getBean("sellerTwo", SellerTwo.class);

        waiterOne.greetTo("XiaoGongJiang");
        System.out.println();

        waiterOne.serverTo("XiaoGongJiang");
        System.out.println();

        waiterTwo.greetTo("XiaoGongJiang");
        System.out.println();

        sellerOne.greetTo("XiaoGongJiang");
        System.out.println();

        sellerOne.greetTo("XiaoGongJiang");
        System.out.println();
    }
}