使用Spring的注解方式實現AOP

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.

然後我們寫一個接口

1. package com.bird.service;
3. public interface PersonServer {
5. public void save(String name);
6. public void update(String name, Integer id);
7. public String getPersonName(Integer id);
9. }

和一個接口實現類

1. package com.bird.service.impl;
3. import com.bird.service.PersonServer;
5. public class PersonServiceBean implements PersonServer{
7. @Override
8. public void save(String name) {
10. System.out.println("我是save方法");
11. // throw new RuntimeException();
12. }
14. @Override
15. public void update(String name, Integer id) {
17. System.out.println("我是update()方法");
18. }
20. @Override
21. public String getPersonName(Integer id) {
23. System.out.println("我是getPersonName()方法");
24. return "xxx";
25. }
27. }

下面使用Spring注解方式對這個Bean進行方法攔截

1. package com.bird.service;
3. import org.aspectj.lang.ProceedingJoinPoint;
4. import org.aspectj.lang.annotation.After;
5. import org.aspectj.lang.annotation.AfterReturning;
6. import org.aspectj.lang.annotation.AfterThrowing;
7. import org.aspectj.lang.annotation.Around;
8. import org.aspectj.lang.annotation.Aspect;
9. import org.aspectj.lang.annotation.Before;
10. import org.aspectj.lang.annotation.Pointcut;
12. /**
13. * 切面
14. * @author Bird
15. *
16. */
17. @Aspect
18. public class MyInterceptor {
19. @Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")
20. private void anyMethod(){}//定義一個切入點
22. @Before("anyMethod() && args(name)")
23. public void doAccessCheck(String name){
24. System.out.println(name);
25. System.out.println("前置通知");
26. }
28. @AfterReturning("anyMethod()")
29. public void doAfter(){
30. System.out.println("後置通知");
31. }
33. @After("anyMethod()")
34. public void after(){
35. System.out.println("最終通知");
36. }
38. @AfterThrowing("anyMethod()")
39. public void doAfterThrow(){
40. System.out.println("例外通知");
41. }
43. @Around("anyMethod()")
44. public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable{
45. System.out.println("進入環繞通知");
46. Object object = pjp.proceed();//執行該方法
47. System.out.println("退出方法");
48. return object;
49. }
50. }

1. @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，然後是包名，.*意思是包下面的所有子包。(..)代

表各種方法.

然後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/

然後在Spring的配置文件中繼續配置Bean,需要打開AOP命名空間

1. <?xml version="1.0" encoding="UTF-8"?>
2. <beans xmlns="http://www.springframework.org/schema/beans"
3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4. xmlns:aop="http://www.springframework.org/schema/aop"
5. xsi:schemaLocation="
6. http://www.springframework.org/schema/beans
7. http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
8. http://www.springframework.org/schema/aop
9. http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
11. <aop:aspectj-autoproxy/>
12. <bean id="personServiceBean" class="com.bird.service.impl.PersonServiceBean"/>
13. <bean id="myInterceptor" class="com.bird.service.MyInterceptor"/>
15. </beans>

然後建立一個Junit測試

1. package junit.test;
3. import org.junit.Test;
4. import org.springframework.context.ApplicationContext;
5. import org.springframework.context.support.ClassPathXmlApplicationContext;
7. import com.bird.service.PersonServer;
9. public class SpringAOPTest {
11. @Test
12. public void inteceptorTest(){
13. ApplicationContext ctx = new ClassPathXmlApplicationContext("beanAop.xml");
14. PersonServer bean = (PersonServer)ctx.getBean("personServiceBean");
15. bean.save(null);
16. }
19. }

測試結果為

1. 2012-3-12 18:08:39 org.springframework.context.support.AbstractApplicationContext prepareRefresh
2. 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
3. 2012-3-12 18:08:40 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
4. 信息: Loading XML bean definitions from class path resource [beanAop.xml]
5. 2012-3-12 18:08:40 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
6. 信息: Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6]: org.springframework.beans.factory.support.DefaultListableBeanFactory@b0bad7
7. 2012-3-12 18:08:40 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
8. 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
9. null
10. 前置通知
11. 進入環繞通知
12. 我是save方法
13. 後置通知
14. 退出方法
15. 最終通知