使用Spring的注解方式实现AOP

spring对AOP的实现提供了很好的支持。下面我们就使用Spring的注解来完成AOP做一个例子。

首先，为了使用Spring的AOP注解功能，必须导入如下几个包。aspectjrt.jar,aspectjweaver.jar,cglib-nodep.jar.

然后我们写一个接口

[java] view plain copy print ?

1. package com.bird.service;  
2.   
3. public interface PersonServer {  
4.   
5.     public void save(String name);  
6.     public void update(String name, Integer id);  
7.     public String getPersonName(Integer id);  
8.       
9. }  

package com.bird.service;

public interface PersonServer {

	public void save(String name);
	public void update(String name, Integer id);
	public String getPersonName(Integer id);
	
}

和一个接口实现类

[java] view plain copy print ?

1. package com.bird.service.impl;  
2.   
3. import com.bird.service.PersonServer;  
4.   
5. public class PersonServiceBean implements PersonServer{  
6.       
7.     @Override  
8.     public void save(String name) {  
9.           
10.         System.out.println("我是save方法");  
11.     //  throw new RuntimeException();  
12.     }  
13.   
14.     @Override  
15.     public void update(String name, Integer id) {  
16.           
17.         System.out.println("我是update()方法");  
18.     }  
19.   
20.     @Override  
21.     public String getPersonName(Integer id) {  
22.           
23.         System.out.println("我是getPersonName()方法");  
24.         return "xxx";  
25.     }  
26.   
27. }  

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注解方式对这个Bean进行方法拦截

[java] view plain copy print ?

1. package com.bird.service;  
2.   
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;  
11.   
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(){}//定义一个切入点  
21.       
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.     }  
27.       
28.     @AfterReturning("anyMethod()")  
29.     public void doAfter(){  
30.         System.out.println("后置通知");  
31.     }  
32.       
33.     @After("anyMethod()")  
34.     public void after(){  
35.         System.out.println("最终通知");  
36.     }  
37.       
38.     @AfterThrowing("anyMethod()")  
39.     public void doAfterThrow(){  
40.         System.out.println("例外通知");  
41.     }  
42.       
43.     @Around("anyMethod()")  
44.     public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable{  
45.         System.out.println("进入环绕通知");  
46.         Object object = pjp.proceed();//执行该方法  
47.         System.out.println("退出方法");  
48.         return object;  
49.     }  
50. }  

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(){}//定义一个切入点
	
	@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("最终通知");
	}
	
	@AfterThrowing("anyMethod()")
	public void doAfterThrow(){
		System.out.println("例外通知");
	}
	
	@Around("anyMethod()")
	public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable{
		System.out.println("进入环绕通知");
		Object object = pjp.proceed();//执行该方法
		System.out.println("退出方法");
		return object;
	}
}

[java] view plain copy print ?

1. @Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")  

@Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")

这句话是方法切入点，execution为执行的意思，*代表任意返回值，然后是包名，.*意思是包下面的所有子包。(..)代

表各种方法.

然后下面的注解就比较简单了，就是在使用方法前和中，还有环绕拦截/

然后在Spring的配置文件中继续配置Bean,需要打开AOP命名空间

[java] view plain copy print ?

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">  
10.           
11.         <aop:aspectj-autoproxy/>  
12.     <bean id="personServiceBean" class="com.bird.service.impl.PersonServiceBean"/>  
13.     <bean id="myInterceptor" class="com.bird.service.MyInterceptor"/>  
14.      
15. </beans>  

<?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>

然后建立一个Junit测试

[java] view plain copy print ?

1. package junit.test;  
2.   
3. import org.junit.Test;  
4. import org.springframework.context.ApplicationContext;  
5. import org.springframework.context.support.ClassPathXmlApplicationContext;  
6.   
7. import com.bird.service.PersonServer;  
8.   
9. public class SpringAOPTest {  
10.       
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.     }  
17.       
18.   
19. }  

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);
	}
	

}

测试结果为

[java] view plain copy print ?

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. 进入环绕通知  
12. 我是save方法  
13. 后置通知  
14. 退出方法  
15. 最终通知  

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
进入环绕通知
我是save方法
后置通知
退出方法
最终通知

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