AOP配置

一、  XML风格 = 采用声明形式实现Spring AOP 

前置通知：------org.springframework.aop.MethodBeforeAdvice

后置通知：-------org.springframework.aop.AfterReturningAdvice

环绕通知：-------org.aopalliance.intercept.MethodInterceptor

异常通知：-------org.springframework.aop.ThrowsAdvice

底层用的是反射：

说明：四选一

* <pre class="code">public void afterThrowing(Exception ex)</pre>

* <pre class="code">public void afterThrowing(RemoteException)</pre>

* <pre class="code">public void afterThrowing(Method method, Object[] args, Object target, Exception ex)</pre>

* <pre class="code">public void afterThrowing(Method method, Object[] args, Object target, ServletException ex)</pre>

配置方式：

在applicationContext.xml中配置：

<!--配置目标对象  --><bean id="factory" class="com.neuedu.demo.Factory"></bean><!--配置增强对象  --><bean id="before" class="com.neuedu.demo.Before"></bean><bean id="after" class="com.neuedu.demo.After"></bean><bean id="around" class="com.neuedu.demo.Around"></bean><bean id="throws" class="com.neuedu.demo.Throws"></bean><!--配置代理对象  --><bean id="proxyFactory" class="org.springframework.aop.framework.ProxyFactoryBean"><!-- 植入目标对象 --><property name="target" ref="factory"></property><!--植入增强对象的名字  --><property name="interceptorNames" value="before,after,around,throws"></property><!-- 如果是面向接口需要配置目标对象的接口 --><property name="proxyInterfaces" value="com.neuedu.demo.Ifactory"></property><!--如果不是面向接口开发需要配置optimize  --><!-- <property name="optimize" value="true"></property> --></bean>

二、AspectJ风格 = 采用注解形式实现Spring AOP

首先，导入jar包

<dependency>    <groupId>org.aspectj</groupId>    <artifactId>aspectjweaver</artifactId>    <version>1.8.10</version></dependency>

1.创建factory实体类

public class Factory implements Ifactory{@Overridepublic void productA() {int k=10/0;System.out.println("生产A");}@Overridepublic void procuctB() {System.out.println("生产B");}@Overridepublic void procuctC() {System.out.println("生产C");}}

2.创建接口类Ifactory

package com.neuedu.demo;public interface Ifactory {public void productA();public void procuctB();public void procuctC();}

3.创建代理对象

package com.neuedu.demo;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.After;import org.aspectj.lang.annotation.AfterReturning;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;@Aspectpublic class ProxyFactory {@Before("execution(* productA(..))")//*代表所有返回值类型（..）代表所有的参数类型public void before() {System.out.println("前置通知");}@AfterReturning("execution(* productA(..))")public void after() {System.out.println("后置通知");}@Around("execution(* productA(..))")public void around(ProceedingJoinPoint joinPoint) throws Throwable {System.out.println("环绕前");joinPoint.proceed();System.out.println("环绕后");}}

注意：

@AfterReturning("execution(* productA(..))")：只有在成功返回之后才会执行后置重置

@After("execution(* productA(..))")：无论是否成功返回都会执行后置通知

4.在applicationContext.xml中配置

<!--配置自动代理 --><aop:aspectj-autoproxy></aop:aspectj-autoproxy><!--配置目标对象  --><bean id="factory" class="com.neuedu.demo.Factory"></bean><!--配置代理对象  --><bean id="proxyFactory" class="com.neuedu.demo.ProxyFactory"></bean>