AOP-AspectJ-基于XML的实现——各种通知

亦凉 2022-06-18 12:51 170阅读 0赞

### AOP-AspectJ-基于XML的实现——各种通知    ###

#### Spring AOP-AspectJ-基于XML的实现各种通知 ####

## 切面类 ##

package com.hk.spring.xml;
    
    import org.aspectj.lang.JoinPoint;
    import org.aspectj.lang.ProceedingJoinPoint;
    import org.aspectj.lang.annotation.After;
    import org.aspectj.lang.annotation.AfterReturning;
    import org.aspectj.lang.annotation.AfterThrowing;
    import org.aspectj.lang.annotation.Around;
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Before;
    import org.aspectj.lang.annotation.Pointcut;
    
    /** * 定义一个简单的POJO类作为切面类 * @author 浪丶荡 * @param <throwing> * */
    //切面类
    public class MyAspect<throwing> { 
    
        /** * 前置通知 */
        public void before(){
            System.out.println("前置方法");
        }
    
        /** * 前置通知2 */
        public void before(JoinPoint j){
            System.out.println("前置方法"+j);
        }
        /** * 后置通知 */
        public void afterReturing(){
            System.out.println("后置方法执行 ");
        }
        /** * 后置通知2 */
        public void afterReturing(String result){
            System.out.println("后置方法执行 result="+result);
        }
        /** * 环绕通知 */
        public String around(ProceedingJoinPoint p){
            Object result = null;
            System.out.println("目标方法执行前");
            try {
                //执行目标方法
                result = p.proceed();
            } catch (Throwable e) {
                e.printStackTrace();
            }
            System.out.println("目标方法执行后");
    
            return ((String) result).toLowerCase();
    
        }
        /** * 异常通知 */
        public void afterThrowing(Exception ex){
            System.out.println("afterThrowing执行,异常是:"+ex.getMessage());
        }
        /** * 异常通知2 */
        public void afterThrowing(){
            System.out.println("afterThrowing执行,异常是:");
        }
        /** * 最终通知 */
        public void after(){
            System.out.println("最终通知方法");
        }
    }

## 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: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/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
            
            <bean id="someService" class="com.hk.spring.xml.ISomeServiceImpl"></bean>
            
            <bean id="myAspect" class="com.hk.spring.xml.MyAspect"></bean>
            
            <aop:config>
                
                <aop:pointcut expression="execution(* *..ISomeService.doFirst(..))" id="doFirstPointcut"/>
                <aop:pointcut expression="execution(* *..ISomeservice.doSecond(..))" id="doSecondPointcut"/>
                <aop:pointcut expression="execution(* *..ISomeservice.doThird(..))" id="doThirdPointcut"/>
                
                <aop:aspect ref="myAspect">
                    
                    <aop:before method="before" pointcut-ref="doFirstPointcut"/>
                    
                    <aop:before method="before(org.aspectj.lang.JoinPoint)" pointcut-ref="doFirstPointcut"/>
                    
                    <aop:after method="after" pointcut-ref="doFirstPointcut"/>
                    
                    <aop:after-returning method="afterReturing(java.lang.String)" pointcut-ref="doFirstPointcut" returning="result"/>
                    
                    <aop:after-returning method="afterReturing" pointcut-ref="doFirstPointcut"/>
                    
                    <aop:around method="around" pointcut-ref="doThirdPointcut"/> 
                    
                    <aop:after-throwing method="afterThrowing" pointcut-ref="doSecondPointcut"/>
                    
                    <aop:after-throwing method="afterThrowing(java.lang.Exception)" pointcut-ref="doSecondPointcut" throwing="ex"/>
    
                </aop:aspect>
            </aop:config>
    </beans>