什么是AspectJ？
AspectJ是一个面向切面的框架，它扩展了Java语言。AspectJ定义了AOP语法，所以它有一个专门的编译器用来生成遵守Java字节编码规范的Class文件。
Aspect注解版
AspectJ自动代理
1.在xml文件中配置如下
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" ?xmlns:aop="http://www.springframework.org/schema/aop" ??????xmlns:context="http://www.springframework.org/schema/context" ??????xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ??????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"> ???<!--目标类型--><bean id="service" class="cn.happy.Aspect01.UserServiceImpl"></bean> ???<!--增强--> ???<bean id="MyAspect" class="cn.happy.Aspect01.UserTest"></bean> ???<!--Aspectj自动代理--> ???<aop:aspectj-autoproxy/></beans>
2.创建接口、类
package cn.happy.Aspect01;/** * Created by Administrator on 2018/3/10. */public interface IUserService { ???void select(); ???void update();}
package cn.happy.Aspect01;/** * Created by Administrator on 2018/3/10. */public class UserServiceImpl implements IUserService { ???public void select() { ???????System.out.println("select OK!"); ???} ???public void update() { ???????int i=5/0; ???????System.out.println("update OK!"); ???}}
UserTest类
package cn.happy.Aspect01;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.*;/** * Created by Administrator on 2018/3/10. */@Aspectpublic class UserTest { ???//前置增强 ???/*@Before("execution(* *..Aspect01.*.select(..))") ???public void MyAspectBefore(){ ???????System.out.println("Before==="); ???}*/ ???//后置增强 ???/*@AfterReturning("execution(* *..Aspect01.*.select(..))") ???public void MyAspectAfter(){ ???????System.out.println("After==="); ???}*/ ???/*//环绕增强 ???@Around("execution(* *..Aspect01.*.select(..))") ???public void MyAround(ProceedingJoinPoint pjp) throws Throwable { ???????System.out.println("环绕增强A"); ???????pjp.proceed(); ???????System.out.println("环绕增强B"); ???}*/ ???/*//异常增强 ???@AfterThrowing("execution(* *..Aspect01.*.update(..))") ???public void MyAfterThrowing(){ ???????System.out.println("网络异常"); ???}*/ //最终增强 ???@After("execution(* *..Aspect01.*.update(..))") ???public void MyAfter(){ ???????System.out.println("最终增强"); ???} ???//PointCut注解 ???@Pointcut(value="execution(* *..Aspect01.*.select(..))") ???public void selects(){} ???@Pointcut(value="execution(* *..Aspect01.*.update(..))") ???public void update(){} ???@AfterReturning("selects()||update()") ???public void MyPointcutAfter(){ ???????System.out.println("After==="); ???}}
AspectJ XML版
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" ?xmlns:aop="http://www.springframework.org/schema/aop" ??????xmlns:context="http://www.springframework.org/schema/context" ??????xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ??????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"> ???<!--目标类型--><bean id="service" class="cn.happy.Aspect02.IUserServiceImpl"></bean> ???<!--增强--> ???<bean id="MyAspect" class="cn.happy.Aspect02.UserTest"></bean> ??<aop:config> ??????<!--切点--> ??????<aop:pointcut id="MyPointCut" expression="execution(* *..Aspect02.*.select(..))"/> ??????<!--切面Aspect--> ??????<aop:aspect ref="MyAspect"> ??????????<!--前置增强--> ??????????<aop:before method="select" pointcut-ref="MyPointCut"/> ???????????<!--后置增强--> ??????????<aop:after-returning method="After" pointcut-ref="MyPointCut"/> ??????????<!--环绕增强--> ???????????<aop:around method="MyAround" pointcut-ref="MyPointCut"/> ??????????<!--异常增强--> ??????????<aop:after-throwing method="MyThrowing" pointcut-ref="MyPointCut"/> ??????????<!--<!–最终增强–> ??????????<aop:after method="MyAfter" pointcut-ref="MyPointCut"/>--> ??????</aop:aspect> ??</aop:config></beans>
AspectJ注解版和XML版
原文地址：https://www.cnblogs.com/xuchangqi1/p/8550954.html