基于aspectj框架实现spring aop

需要的jar包:

xml配置文件方式实现aop操作

①创建被增强接口ThinkDao.java及接口实现ThinkDaoImpl.java(切入点)

 1 package com.xml.dao;
 2 
 3 /**
 4  *被增强接口 
 5  */
 6 public interface ThinkDao {
 7 
 8     /**
 9      * 被增强方法
10      */
11     public void thinkDao();
12 }
13 
14 
15 
16 package com.xml.dao.impl;
17 
18 import com.xml.dao.ThinkDao;
19 
20 /**
21  *被增强方法实现类
22  */
23 public class ThinkDaoImpl implements ThinkDao {
24 
25     @Override
26     public void thinkDao() {
27         System.out.println("我是被增强方法。。。");
28     }
29 }

②创建切面类Real.java(切面)

 1 package com.xml.dao;
 2 
 3 import org.aspectj.lang.ProceedingJoinPoint;
 4 
 5 /**
 6  * 增强类(通知)
 7  * @author bianxc
 8  */
 9 public class Real {
10 
11     public void before() {
12         System.out.println("前置通知。。。");
13     }
14     
15     public void after() {
16         System.out.println("后置通知。。。");
17     }
18     
19     /**
20      * 环绕增强
21      * @param proceedingJoinPoint
22      * @throws Throwable
23      */
24     public void around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
25         System.out.println("方法之前。。。");
26         proceedingJoinPoint.proceed();
27         System.out.println("方法之后。。。");
28     }
29 }

③核心配置文件xmlContext.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     xsi:schemaLocation="
 6         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 7         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd ">
 8         
 9         <!-- 实例化ThinkDao类 -->
10         <bean id="thinkDao" class="com.xml.dao.impl.ThinkDaoImpl"/>
11         <!-- 增强类对象 -->
12         <bean id="real" class="com.xml.dao.Real"/>
13         
14         <!-- aop操作 -->
15         <aop:config>
16             <!-- 切入点 -->
17             <aop:pointcut expression="execution(* com.xml.dao.impl.ThinkDaoImpl.*(..))" id="pc"/>
18             <!-- 切面 -->
19             <aop:aspect ref="real">
20                 <!-- 前置通知 -->
21                 <aop:before method="before" pointcut-ref="pc"/>
22                 <!-- 后置通知 -->
23                 <aop:after method="after" pointcut-ref="pc"/>
24                 <!-- 环绕通知 -->
25                 <aop:around method="around" pointcut-ref="pc"/>
26             </aop:aspect>
27         </aop:config>
28 </beans>

④创建测试类TestXml.java

 1 package com.xml.test;
 2 
 3 import org.junit.jupiter.api.Test;
 4 import org.springframework.context.ApplicationContext;
 5 import org.springframework.context.support.ClassPathXmlApplicationContext;
 6 
 7 import com.xml.dao.ThinkDao;
 8 
 9 public class TestXml {
10     
11     @Test
12     public void testXml() {
13         ApplicationContext context = new ClassPathXmlApplicationContext("xmlContext.xml");
14         ThinkDao thinkDao = (ThinkDao) context.getBean("thinkDao");
15         thinkDao.thinkDao();
16     }
17 }

注解方式实现aop操作

注:使用注解方式实现aop操作较xm配置文件方式代码简化了很多,减少了配置文件中繁琐的配置;

只需要在配置文件中开启aop的自动代理,和注解的自动扫描就可以了,剩下的全部由注解来实现

①创建被增强接口ThinkDao.java及接口实现ThinkDaoImpl.java(切入点)

 1 package com.anno.dao;
 2 
 3 /**
 4  *被增强接口
 5  */
 6 public interface ThinkDao {
 7 
 8     /**
 9      * 被增强方法
10      */
11     public void thinkDao();
12 }
13 
14 
15 
16 package com.anno.dao.impl;
17 
18 import org.springframework.stereotype.Component;
19 
20 import com.anno.dao.ThinkDao;
21 
22 /**
23  * 被增强方法实现类
24  */
25 @Component("thinkDao")
26 public class ThinkDaoImpl implements ThinkDao {
27 
28     @Override
29     public void thinkDao() {
30         System.out.println("我是被增强方法。。。");
31     }
32 
33 }

②创建切面类Real.java(切面)

 1 package com.anno.dao.impl;
 2 
 3 import org.aspectj.lang.ProceedingJoinPoint;
 4 import org.aspectj.lang.annotation.After;
 5 import org.aspectj.lang.annotation.Around;
 6 import org.aspectj.lang.annotation.Aspect;
 7 import org.aspectj.lang.annotation.Before;
 8 import org.springframework.stereotype.Component;
 9 
10 /**
11  * 增强类(通知)
12  * @author bianxc
13  */
14 @Component("real")
15 @Aspect
16 public class Real {
17 
18     // 前置通知
19     @Before("execution(* com.anno.dao.impl.ThinkDaoImpl.*(..))")
20     public void before() {
21         System.out.println("前置通知。。。");
22     }
23     
24     // 后置增强
25     @After("execution(* com.anno.dao.impl.ThinkDaoImpl.*(..))")
26     public void after() {
27         System.out.println("后置通知。。。");
28     }
29     
30     // 环绕增强
31     @Around("execution(* com.anno.dao.impl.ThinkDaoImpl.*(..))")
32     public void around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
33         System.out.println("方法之前。。。");
34         proceedingJoinPoint.proceed();
35         System.out.println("方法之后。。。");
36     }
37 }

③核心配置文件annoContext.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         <!-- 开启注解扫描 -->
12         <context:component-scan base-package="com.anno.*"></context:component-scan>
13         <!-- 开启自动代理 -->
14         <aop:aspectj-autoproxy/>
15 </beans>

④创建测试类TestAnno.java

 1 package com.anno.test;
 2 
 3 import org.junit.Test;
 4 import org.junit.runner.RunWith;
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.test.context.ContextConfiguration;
 7 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 8 
 9 import com.anno.dao.ThinkDao;
10 
11 @ContextConfiguration("classpath:annoContext.xml")
12 @RunWith(SpringJUnit4ClassRunner.class)
13 public class TestAnno {
14     
15     @Autowired
16     private ThinkDao thinkDao;
17 
18     @Test
19     public void testAnno() {
20         thinkDao.thinkDao();
21     }
22 }

执行结果:

总结:注解的方式实现aop简化了xml配置文件中臃肿的代码,在企业开发中通常以注解的方式进行开发!

猜你喜欢

转载自www.cnblogs.com/bianxcArticle/p/12704744.html
今日推荐