aop （！void，用来拦截有返回值的函数）

cn.itcast.service

[java] view plaincopy

1. package cn.itcast.service;  
2.   
3. public interface PersonService {  
4.     public void save(String name);  
5.     public void update(String name, Integer id);  
6.     public String getPersonName(Integer id);  
7. }  

[java] view plaincopy

1. package cn.itcast.service;  
2.   
3. import org.aspectj.lang.ProceedingJoinPoint;  
4. /** 
5.  * 切面 
6.  * 
7.  */  
8. public class MyInterceptor {      
9.     public void doAccessCheck() {  
10.         System.out.println("前置通知");  
11.     }  
12.   
13.     public void doAfterReturning() {  
14.         System.out.println("后置通知");  
15.     }  
16.       
17.     public void doAfter() {  
18.         System.out.println("最终通知");  
19.     }  
20.       
21.     public void doAfterThrowing() {  
22.         System.out.println("例外通知");  
23.     }  
24.       
25.     public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable {  
26.         System.out.println("进入方法");  
27.         Object result = pjp.proceed();  
28.         System.out.println("退出方法");  
29.         return result;  
30.     }  
31.       
32. }  

cn.itcast.service.impl

[java] view plaincopy

1. package cn.itcast.service.impl;  
2.   
3. import cn.itcast.service.PersonService;  
4.   
5. public class PersonServiceBean implements PersonService {  
6.   
7.     public String getPersonName(Integer id) {  
8.         System.out.println("我是getPersonName()方法");  
9.         return "xxx";  
10.     }  
11.   
12.     public void save(String name) {  
13.         //throw new RuntimeException("我爱例外");  
14.         System.out.println("我是save()方法");  
15.     }  
16.   
17.     public void update(String name, Integer id) {  
18.         System.out.println("我是update()方法");  
19.     }  
20.   
21. }  

junit.test

[java] view plaincopy

1. package junit.test;  
2.   
3.   
4. import org.junit.BeforeClass;  
5. import org.junit.Test;  
6. import org.springframework.context.ApplicationContext;  
7. import org.springframework.context.support.ClassPathXmlApplicationContext;  
8.   
9. import cn.itcast.service.PersonService;  
10.   
11. public class testAOP {  
12.   
13.     @BeforeClass  
14.     public static void setUpBeforeClass() throws Exception {  
15.     }  
16.     @Test public void interceptorTest(){  
17.         ApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml");  
18.         PersonService personService = (PersonService)cxt.getBean("personService");  
19.         personService.getPersonName(2);  
20.     }  
21. }  

beans.xml

<?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="cn.itcast.service.impl.PersonServiceBean"></bean>        <bean id="aspetbean" class="cn.itcast.service.MyInterceptor"/>        <aop:config>        <aop:aspect id="asp" ref="aspetbean">                <!-- 第一个代表返回值类型，中间的代表包，括号中的代表参数， -->        <!-- 这样写可以拦截有返回值的函数 -->        <aop:pointcut id="mycut" expression="execution(!void cn.itcast.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>