XML方式实现Spring的AOP

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1、编写切面类

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package com.fz.annotation.aop;
 
import org.aspectj.lang.ProceedingJoinPoint;
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;
import org.springframework.stereotype.Component;
 
public class LogInterceptor {
     
    public void before(){
        System.out.println("方法之前执行....");
    }
    public void afterRutting(){
        System.out.println("方法正常执行之后....");
    }
    public void afterThrowing(){
        System.out.println("方法抛出异常之后....");
    }
    public void around(ProceedingJoinPoint pjp) throws Throwable{
        System.out.println("方法执之前around......");
        pjp.proceed();//向下继续方法的执行：（包括执行其他切面的拦截，如果当中抛出异常，则不会向下继续执行）
        System.out.println("方法执之后around......");//这里会在@AfterReturning执行之后执行
    }
}

2、编写applicationContext.xml文件

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<?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-3.0.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-3.0.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
    <context:annotation-config />
    <context:component-scan base-package="com.fz.annotation" />
    <bean id="logInterceptor" class="com.fz.annotation.aop.LogInterceptor">
    </bean>
    <aop:config>
        <aop:pointcut
            expression="execution(public void com.fz.annotation.service.impl.UserServiceImpl.userAdd(com.fz.xml.entity.User))"
            id="servicePointcut" />
        <aop:aspect id="logAspect" ref="logInterceptor">
            <aop:before method="before" pointcut-ref="servicePointcut" />
        </aop:aspect>
    </aop:config>
     
</beans>

其中：<aop:pointcut>标签和<aop:aspect>同级，表示<aop:pointcut>是一个全局的pointcut

也可以让pointcut只供某一个逻辑使用，像下面这样写

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<aop:config>
    <aop:aspect id="logAspect" ref="logInterceptor">
         <aop:pointcut id="servicePointcut"
        expression="execution(public void com.fz.annotation.service.impl.UserServiceImpl.userAdd(com.fz.xml.entity.User))"/>         
        <aop:before method="before" pointcut-ref="servicePointcut" />
    </aop:aspect>
</aop:config>

还有可以这样写，注意：直接在before里写pointcut属性的时候需要将pointcut-ref属性去掉

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<aop:config>
    <aop:aspect id="logAspect" ref="logInterceptor">
        <aop:before method="before" pointcut="execution(public void com.fz.annotation.service.impl.UserServiceImpl.userAdd(com.fz.xml.entity.User))"/>
    </aop:aspect>
</aop:config>

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