zoukankan html css js c++ java

AOP中的ASPECTJ

一、准备

　　1.架包

　　2.配置文件

二、注解的形式

　　　UserDao.java

 1 package cn.itcast.spring.aspectj.annocation;
 2 
 3 public class UserDao {
 4     
 5     public void add(){
 6         System.out.println("add......");
 7     }
 8     
 9     public void delete(){
10         System.out.println("delete......");
11         int i = 1/0;
12     }
13     
14     public String update(){
15         System.out.println("update......");
16         
17         return "我被返回了";
18     }
19     
20     public void find(){
21         System.out.println("find......");
22     }
23     
24     public void edit(){
25         System.out.println("edit");
26     }
27 
28 }

　　MyAspectj.java

 1 package cn.itcast.spring.aspectj.annocation;
 2 
 3 import org.aspectj.lang.JoinPoint;
 4 import org.aspectj.lang.ProceedingJoinPoint;
 5 import org.aspectj.lang.annotation.After;
 6 import org.aspectj.lang.annotation.AfterReturning;
 7 import org.aspectj.lang.annotation.AfterThrowing;
 8 import org.aspectj.lang.annotation.Around;
 9 import org.aspectj.lang.annotation.Aspect;
10 import org.aspectj.lang.annotation.Before;
11 import org.aspectj.lang.annotation.Pointcut;
12 
13 /**
14  * 定义切面类： 切点和通知
15  * @author Administrator
16  *
17  */
18 @Aspect//切面类的标识
19 public class MyAspectj {
20     
21     /**
22      * 前置通知
23      */
24     @Before("MyAspectj.myPointcut()")
25     public void before(JoinPoint point){
26         System.out.println("前置通知");
27         System.out.println("方法名"+point.getSignature().getName());
28     }
29     
30     /**
31      * 后置通知
32      */
33     @AfterReturning(value="execution(* cn.itcast.spring.aspectj.annocation.UserDao.update(..))",returning="val")
34     public void afterReturning(JoinPoint point,Object val){
35         System.out.println("后置通知");
36         System.out.println("方法名"+point.getSignature().getName());
37         System.out.println("返回值："+val);
38     }
39     
40     /**
41      * 环绕增强
42      * @throws Throwable 
43      */
44     @Around(value="execution(* cn.itcast.spring.aspectj.annocation.UserDao.find(..))")
45     public Object around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable{
46         System.out.println("环绕前");
47         Object result = proceedingJoinPoint.proceed();//可以组织方法执行
48         System.out.println("环绕后");
49         return result;
50     }
51     
52     /*
53      * 异常通知
54      */
55     @AfterThrowing(value="execution(* cn.itcast.spring.aspectj.annocation.UserDao.delete(..))",throwing="tw")
56     public void afterThrowing(Throwable tw){
57         System.out.println("异常通知");
58         System.out.println(tw.getMessage());
59     }
60     
61     /*
62      * 最终通知
63      */
64     @After("execution(* cn.itcast.spring.aspectj.annocation.UserDao.edit(..))")
65     public void after(){
66         System.out.println("最终通知");
67     }
68     
69     /*
70      * 定义一个切点,通用型的表达式 
71      * 使用切面类.切点()
72      */
73     
74     @Pointcut("execution(* cn.itcast.spring.aspectj.annocation.UserDao.add(..))")
75     private void myPointcut(){};
76     
77 
78 }

　　TestAspectjAnnocation.java

 1 package cn.itcast.spring.aspectj.annocation;
 2 
 3 import org.junit.Test;
 4 import org.junit.runner.RunWith;
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.beans.factory.annotation.Qualifier;
 7 import org.springframework.test.context.ContextConfiguration;
 8 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 9 
10 @RunWith(SpringJUnit4ClassRunner.class)
11 @ContextConfiguration(locations="classpath:applicationContext.xml")
12 public class TestAspectjAnnocation {
13     @Autowired
14     @Qualifier("userDao")
15     private UserDao userDao;
16     
17     @Test
18     public void testAspectjAnnocation(){
19         userDao.add();
20         //userDao.delete();
21     }
22     
23 
24 }

　　applicationContxt.xml

 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        xmlns:context="http://www.springframework.org/schema/context"
 6        xsi:schemaLocation="
 7 http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 8 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
 9 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
10 
11 <!-- 引入目标类  和切面类-->
12 <bean id="userDao" class="cn.itcast.spring.aspectj.annocation.UserDao"></bean>
13 <bean id="myAspectj" class="cn.itcast.spring.aspectj.annocation.MyAspectj"></bean>
14 
15 <!-- 使用aop的自动代理自动扫描 -->
16 <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
17 
18 </beans>

三、使用xml的形式

　　UserDao.java

 1 package cn.itcast.spring.aspectj.xml;
 2 
 3 public class UserDao {
 4     
 5     public void add(){
 6         System.out.println("add......");
 7     }
 8     
 9     public void delete(){
10         System.out.println("delete......");
11         int i = 1/0;
12     }
13     
14     public String update(){
15         System.out.println("update......");
16         
17         return "我被返回了";
18     }
19     
20     public void find(){
21         System.out.println("find......");
22     }
23     
24     public void edit(){
25         System.out.println("edit");
26     }
27 
28 }

　　MyAspectj.java

 1 package cn.itcast.spring.aspectj.xml;
 2 
 3 import org.aspectj.lang.JoinPoint;
 4 import org.aspectj.lang.ProceedingJoinPoint;
 5 import org.aspectj.lang.annotation.After;
 6 import org.aspectj.lang.annotation.AfterReturning;
 7 import org.aspectj.lang.annotation.AfterThrowing;
 8 import org.aspectj.lang.annotation.Around;
 9 import org.aspectj.lang.annotation.Aspect;
10 import org.aspectj.lang.annotation.Before;
11 import org.aspectj.lang.annotation.Pointcut;
12 
13 /**
14  * 定义切面类： 切点和通知
15  * @author Administrator
16  *
17  */
18 
19 public class MyAspectj {
20     
21     /**
22      * 前置通知
23      */
24     
25     public void before(JoinPoint point){
26         System.out.println("前置通知");
27         System.out.println("方法名"+point.getSignature().getName());
28     }
29     
30     /**
31      * 后置通知
32      */
33     public void afterReturning(JoinPoint point,Object val){
34         System.out.println("后置通知");
35         System.out.println("方法名"+point.getSignature().getName());
36         System.out.println("返回值："+val);
37     }
38     
39     /**
40      * 环绕增强
41      * @throws Throwable 
42      */
43     public Object around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable{
44         System.out.println("环绕前");
45         Object result = proceedingJoinPoint.proceed();//可以组织方法执行
46         System.out.println("环绕后");
47         return result;
48     }
49     
50     /*
51      * 异常通知
52      */
53     public void afterThrowing(Throwable tw){
54         System.out.println("异常通知");
55         System.out.println(tw.getMessage());
56     }
57     
58     /*
59      * 最终通知
60      */
61     public void after(){
62         System.out.println("最终通知");
63     }
64     
65 
66 }

　　TestAspectjXml.java

 1 package cn.itcast.spring.aspectj.xml;
 2 
 3 import org.junit.Test;
 4 import org.junit.runner.RunWith;
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.beans.factory.annotation.Qualifier;
 7 import org.springframework.test.context.ContextConfiguration;
 8 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 9 
10 @RunWith(SpringJUnit4ClassRunner.class)
11 @ContextConfiguration(locations="classpath:applicationContext2.xml")
12 public class TestAspectjXML {
13     @Autowired//自动装配bean
14     @Qualifier("userDao")
15     private UserDao userDao;
16     
17     @Test
18     public void testAspectjAnnocation(){
19         System.out.println(userDao);
20         userDao.add();
21         //userDao.delete();
22     }
23     
24 
25 }

　　applicationContext.xml

 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        xmlns:context="http://www.springframework.org/schema/context"
 6        xsi:schemaLocation="
 7 http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 8 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
 9 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
10 
11 <!-- 引入目标类  和切面类-->
12 <bean id="userDao" class="cn.itcast.spring.aspectj.xml.UserDao"></bean>
13 <bean id="myAspectj" class="cn.itcast.spring.aspectj.xml.MyAspectj"></bean>
14 
15 <!-- aop的配置 -->
16 <aop:config>
17     <!-- 定义切入点：也就是也要增强的哪些方法 -->
18     <aop:pointcut expression="execution(* cn.itcast.spring.aspectj.xml.UserDao.add(..))" id="myPointcut1"/>
19     <aop:pointcut expression="execution(* cn.itcast.spring.aspectj.xml.UserDao.find(..))" id="myPointcut2"/>
20     <aop:pointcut expression="execution(* cn.itcast.spring.aspectj.xml.UserDao.delete(..))" id="myPointcut3"/>
21     <aop:pointcut expression="execution(* cn.itcast.spring.aspectj.xml.UserDao.update(..))" id="myPointcut4"/>
22     <aop:pointcut expression="execution(* cn.itcast.spring.aspectj.xml.UserDao.edit(..))" id="myPointcut5"/>
23     <!-- 切面类的配置 -->
24     <aop:aspect ref="myAspectj">
25         <aop:before method="before" pointcut-ref="myPointcut1"/>
26         <aop:after-returning method="afterReturning" returning="val" pointcut-ref="myPointcut2" />
27         <aop:after-throwing method="afterThrowing"  throwing="tw" pointcut-ref="myPointcut3"/>
28         <aop:around method="around" pointcut-ref="myPointcut4"/>
29         <!-- 最终通知 -->
30         <aop:after method="after" pointcut-ref="myPointcut5"/>
31     </aop:aspect>
32 
33 </aop:config>
34 </beans>

查看全文

相关阅读:
手把手教你实现热力图！
[学习笔记]overthewire bandit 通关秘籍
 施乐3065复印机邮件功能调试
 [IT学习]Greatwall
[IT学习]从网上获取pdf制作vce文件
 [办公自动化]如何选择投影仪的吊装距离
 [读书笔记]《没人会告诉你的PPT真相》
英文主日学材料备忘
 win10访问共享文件夹提示：引用的账户当前已锁定，且当前可能无法登陆
 [IT学习]Linux 学习笔记

原文地址：https://www.cnblogs.com/geyaofendou/p/6720127.html