<span style="font-family: 微软雅黑; font-size: 10.5pt; letter-spacing: 0pt; ">AOP概念</span>
Aspect(切面):它跟类相似,只是两者的关注点不一样,类是对物体特征的抽象,而切面是对横切性关注点的抽象
joinpoint(连接点):所谓连接点就是被拦截到的点,在spring中,这些点是方法,因为spring只支持方法类型的连接点,实际上joinpoint还可以是field或类构造器.
pointcut(切入点):就是要对哪些点进行拦截的定义。
advice(通知):拦截到的joinpoint之后所要做的事情就是通知,通知分为前置通知,后置通知,异常通知,最终通知,环绕通知。通知就是要做的事情。
target(目标对象):代理的目标对象
weave(织入):指将aspect应用到target对象并导致proxy对象创建的过程称为织入。
Introduction(引入);在不修改类代码的前提下,Introduction可以在运行期动态地添加一些方法或者field.
AOP使用到的jar包
spring.jar
commons-logging.jar
aspectjweaver.jar
aspectjrt.jar
cglib-nodep-2.1.3.jar
如果使用了SR250中的注解,如@Resource/@PostConstruct/@PreDestroy的还要引入common-annotation.jar
AOP命名空间的配置
使用spring框架aop要引入下面的aop命名空间(红色部分)
<?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-2.5.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
<aop:aspectj-autoproxy/>
</beans>
下面是使用注释法的aop切面编程的示例的主要代码
package com.gdhdcy.service; 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; @Aspect public class MyInterceptor { @Pointcut("execution (* com.gdhdcy.service.impl.PersonServiceBean.*(..))") private void anyMethod(){};//生命一个切入点 @Before("anyMethod() && args(name)") //填写的是切入点的方法名称,记得要加上() public void doAccessCheck( String name){ System.out.println("前置通知"+name); } //@AfterReturning("anyMethod()") @AfterReturning(pointcut="anyMethod()",returning="result") //得到返回值 public void doAfterReturning(String result){ System.out.println("后置通知"+result); } @After("anyMethod()") public void doAfter(){ System.out.println("最终通知"); } //@AfterThrowing("anyMethod()") @AfterThrowing(pointcut="anyMethod()",throwing="e") public void doAfterThrowing(Exception e){ System.out.println("例外通知"+e); } @Around("anyMethod()") public Object doAround(ProceedingJoinPoint pjp)throws Throwable{ System.out.println("环绕通知进入"); Object result=pjp.proceed(); System.out.println("环绕通知退出"); return result; } }
注释方法beans.xml配置文档
<?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-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> <aop:aspectj-autoproxy/><!-- 基于注解 --> <bean id="myInterceptor" class="com.gdhdcy.service.MyInterceptor"/> <bean id="personService" class="com.gdhdcy.service.impl.PersonServiceBean"/> </beans>
http://pan.baidu.com/s/1jGmQMjG
xml方法aop切面编程的示例的主要代码
package cn.itcast.service; import org.aspectj.lang.ProceedingJoinPoint; /** * 切面 * */ public class MyInterceptor { public void doAccessCheck() { System.out.println("前置通知"); } public void doAfterReturning() { System.out.println("后置通知"); } public void doAfter() { System.out.println("最终通知"); } public void doAfterThrowing() { System.out.println("例外通知"); } public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable { System.out.println("进入方法"); Object result = pjp.proceed(); System.out.println("退出方法"); return result; } }
<?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-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> <aop:aspectj-autoproxy/> <bean id="personService" class="com.gdhdcy.service.impl.PersonServiceBean"></bean> <bean id="aspetbean" class="com.gdhdcy.service.MyInterceptor"/> <aop:config> <aop:aspect id="asp" ref="aspetbean"> <aop:pointcut id="mycut" expression="execution(* com.gdhdcy.service..*.*(..))"/> <aop:before pointcut-ref="mycut" method="doAccessCheck"/> <aop:after-returning pointcut-ref="mycut" method="doAfterReturning"/> <aop:after-throwing pointcut-ref="mycut" method="doAfterThrowing"/> <aop:after pointcut-ref="mycut" method="doAfter"/> <aop:around pointcut-ref="mycut" method="doBasicProfiling"/> </aop:aspect> </aop:config> </beans>
AOP基础知识及AOP切面编程之注释方法、xml配置方法,布布扣,bubuko.com
原文:http://blog.csdn.net/wanghaiping1993/article/details/38636939