AOP用注解實現
老師有用注解的方式的列子嗎
qq_雨依_0
2017-09-24
1 回答
舉報
0/150
提交
取消
老師有用注解的方式的列子嗎
2017-09-24
舉報
2017-09-25
Spring對AOP的實現提供了很好的支持。下面我們就使用Spring的注解來完成AOP做一個例子。
首先，為了使用Spring的AOP注解功能，必須導入如下幾個包。aspectjrt.jar,aspectjweaver.jar,cglib-nodep.jar.
然后我們寫一個接口
[java]?view plain?copy?print?
package?com.bird.service;??
??
public?interface?PersonServer?{??
??
????public?void?save(String?name);??
????public?void?update(String?name,?Integer?id);??
????public?String?getPersonName(Integer?id);??
??????
}??
和一個接口實現類
[java]?view plain?copy?print?
package?com.bird.service.impl;??
??
import?com.bird.service.PersonServer;??
??
public?class?PersonServiceBean?implements?PersonServer{??
??????
????@Override??
????public?void?save(String?name)?{??
??????????
????????System.out.println("我是save方法");??
????//??throw?new?RuntimeException();??
????}??
??
????@Override??
????public?void?update(String?name,?Integer?id)?{??
??????????
????????System.out.println("我是update()方法");??
????}??
??
????@Override??
????public?String?getPersonName(Integer?id)?{??
??????????
????????System.out.println("我是getPersonName()方法");??
????????return?"xxx";??
????}??
??
}??
下面使用Spring注解方式對這個Bean進行方法攔截
[java]?view plain?copy?print?
package?com.bird.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;??
??
/**?
?*?切面?
?*?@author?Bird?
?*?
?*/??
@Aspect??
public?class?MyInterceptor?{??
????@Pointcut("execution(*?com.bird.service.impl.PersonServiceBean.*(..))")??
????private?void?anyMethod(){}//定義一個切入點??
??????
????@Before("anyMethod()?&&?args(name)")??
????public?void?doAccessCheck(String?name){??
????????System.out.println(name);??
????????System.out.println("前置通知");??
????}??
??????
????@AfterReturning("anyMethod()")??
????public?void?doAfter(){??
????????System.out.println("后置通知");??
????}??
??????
????@After("anyMethod()")??
????public?void?after(){??
????????System.out.println("最終通知");??
????}??
??????
????@AfterThrowing("anyMethod()")??
????public?void?doAfterThrow(){??
????????System.out.println("例外通知");??
????}??
??????
????@Around("anyMethod()")??
????public?Object?doBasicProfiling(ProceedingJoinPoint?pjp)?throws?Throwable{??
????????System.out.println("進入環繞通知");??
????????Object?object?=?pjp.proceed();//執行該方法??
????????System.out.println("退出方法");??
????????return?object;??
????}??
}??
[java]?view plain?copy?print?
@Pointcut("execution(*?com.bird.service.impl.PersonServiceBean.*(..))")??
這句話是方法切入點，execution為執行的意思，*代表任意返回值，然后是包名，.*意思是包下面的所有子包。(..)代
表各種方法.
然后下面的注解就比較簡單了，就是在使用方法前和中，還有環繞攔截/
然后在Spring的配置文件中繼續配置Bean,需要打開AOP命名空間
[java]?view plain?copy?print?
<?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/>??
????<bean?id="personServiceBean"?class="com.bird.service.impl.PersonServiceBean"/>??
????<bean?id="myInterceptor"?class="com.bird.service.MyInterceptor"/>??
?????
</beans>??
然后建立一個Junit測試
[java]?view plain?copy?print?
package?junit.test;??
??
import?org.junit.Test;??
import?org.springframework.context.ApplicationContext;??
import?org.springframework.context.support.ClassPathXmlApplicationContext;??
??
import?com.bird.service.PersonServer;??
??
public?class?SpringAOPTest?{??
??????
????@Test??
????public?void?inteceptorTest(){??
????????ApplicationContext?ctx?=?new?ClassPathXmlApplicationContext("beanAop.xml");??
????????PersonServer?bean?=?(PersonServer)ctx.getBean("personServiceBean");??
????????bean.save(null);??
????}??
??????
??
}??
測試結果為
[java]?view plain?copy?print?
2012-3-12?18:08:39?org.springframework.context.support.AbstractApplicationContext?prepareRefresh??
信息:?Refreshing?org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6:?display?name?[org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6];?startup?date?[Mon?Mar?12?18:08:39?CST?2012];?root?of?context?hierarchy??
2012-3-12?18:08:40?org.springframework.beans.factory.xml.XmlBeanDefinitionReader?loadBeanDefinitions??
信息:?Loading?XML?bean?definitions?from?class?path?resource?[beanAop.xml]??
2012-3-12?18:08:40?org.springframework.context.support.AbstractApplicationContext?obtainFreshBeanFactory??
信息:?Bean?factory?for?application?context?[org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6]:?org.springframework.beans.factory.support.DefaultListableBeanFactory@b0bad7??
2012-3-12?18:08:40?org.springframework.beans.factory.support.DefaultListableBeanFactory?preInstantiateSingletons??
信息:?Pre-instantiating?singletons?in?org.springframework.beans.factory.support.DefaultListableBeanFactory@b0bad7:?defining?beans?[org.springframework.aop.config.internalAutoProxyCreator,personServiceBean,myInterceptor];?root?of?factory?hierarchy??
null??
前置通知??
進入環繞通知??
我是save方法??
后置通知??
退出方法??
最終通知??