Spring AOP 中 advice 的四种类型 before after throwing advice around

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Spring AOP 中 advice 的四种类型 before after throwing advice around

2024-09-29 12:45:39 216人阅读

spring AOP(Aspect-oriented programming) 是用于切面编程，简单的来说：AOP相当于一个拦截器，去拦截一些处理，例如：当一个方法执行的时候，Spring 能够拦截正在执行的方法，在方法执行的前或者后增加额外的功能和处理。

在Spring AOP中支持4中类型的通知：

1：before advice 在方法执行前执行。

2：after returning advice 在方法执行后返回一个结果后执行。

3：after throwing advice 在方法执行过程中抛出异常的时候执行。

4：Around advice 在方法执行前后和抛出异常时执行，相当于综合了以上三种通知。

下面是一个简单的AOP advice 的例子：

首先给出一个简单的Spring 注入的例子，

定义一个Book类：

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package com.myapp.core.aop.advice;
public class Book {
private String name;
private String url;
private int pages;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public int getPages() {
return pages;
}
public void setPages(int pages) {
this.pages = pages;
}
public void printName(){
System.out.println("Book name "+ this.name);
}
public void printUrl(){
System.out.println("Book URL "+this.url);
}
public void printThrowException(){
throw new IllegalArgumentException();
}
}

package com.myapp.core.aop.advice;

public class Book {
   private  String  name;
   private  String  url;
   private   int    pages;
   
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getUrl() {
		return url;
	}
	public void setUrl(String url) {
		this.url = url;
	}
	public int getPages() {
		return pages;
	}
	public void setPages(int pages) {
		this.pages = pages;
	}


	public  void  printName(){
		System.out.println("Book name "+ this.name);
	}
	
	public  void  printUrl(){
		System.out.println("Book URL "+this.url);
	}
	
	public  void  printThrowException(){
		throw  new  IllegalArgumentException();
	}
   
}

相应的配置文件：

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="book" class="com.myapp.core.aop.advice.Book">
<property name="name" value=http://www.mamicode.com/"Effective java" />
<property name="url" value=http://www.mamicode.com/"www.google.cn"/>
<property name="pages" value=http://www.mamicode.com/"300" />
</bean>
</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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

  <!-- more bean definitions for data access objects go here -->
   
    <bean id="book" class="com.myapp.core.aop.advice.Book">
	    <property name="name" value="http://www.mamicode.com/Effective java" />
	    <property name="url" value="http://www.mamicode.com/www.google.cn"/>
	    <property name="pages" value="http://www.mamicode.com/300" />
    </bean>
</beans>

对应的测试类：

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package com.myapp.core.aop.advice;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainTest {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("resource/aop.xml");
Book book = (Book) context.getBean("book");
System.out.println("---------------------");
book.printName();
System.out.println("---------------------");
book.printUrl();
System.out.println("----------------------");
try{
book.printThrowException();
}catch(Exception e){
// e.printStackTrace();
}
}
}

package com.myapp.core.aop.advice;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainTest {
   public static void main(String[] args) {
	  
	   ApplicationContext  context  = new  ClassPathXmlApplicationContext("resource/aop.xml");
	   
	   Book   book  =   (Book) context.getBean("book");
	   
	   System.out.println("---------------------");
       
	   book.printName();
	   
	   System.out.println("---------------------");
	   
	   book.printUrl();
	   
	   System.out.println("----------------------");
	   
	   try{
		   
		  book.printThrowException();
		   
	   }catch(Exception e){
		 //  e.printStackTrace();
	   }
	   
	   
}
}

输出结果：

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三月 20, 2013 11:01:01 上午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@11e831: startup date [Wed Mar 20 11:01:01 CST 2013]; root of context hierarchy
三月 20, 2013 11:01:01 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [resource/aop.xml]
三月 20, 2013 11:01:01 上午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@13b5500: defining beans [book]; root of factory hierarchy
---------------------
Book name Effective java
---------------------
Book URL www.google.cn
----------------------

三月 20, 2013 11:01:01 上午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@11e831: startup date [Wed Mar 20 11:01:01 CST 2013]; root of context hierarchy
三月 20, 2013 11:01:01 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [resource/aop.xml]
三月 20, 2013 11:01:01 上午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@13b5500: defining beans [book]; root of factory hierarchy
---------------------
Book name Effective java
---------------------
Book URL www.google.cn
----------------------

下面对以上的Book加上Spring AOP advices

1：before advice

before advice将在方法执行前执行，创建一个实现MethodBeforeAdvice接口的类能够定义执行方法前的操作。

类如下：

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package com.myapp.core.aop.advice;
import java.lang.reflect.Method;
import org.springframework.aop.MethodBeforeAdvice;
public class BeforeMethod implements MethodBeforeAdvice {
@Override
public void before(Method arg0, Object[] arg1, Object arg2)
throws Throwable {
// TODO Auto-generated method stub
System.out.println("Before Method");
System.out.println("--------------------");
}
}

package com.myapp.core.aop.advice;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class BeforeMethod  implements MethodBeforeAdvice {

	@Override
	public void before(Method arg0, Object[] arg1, Object arg2)
			throws Throwable {
		// TODO Auto-generated method stub
		
		System.out.println("Before  Method");
		System.out.println("--------------------");
		
	}
 
}

配置对应的bean：

在aop.xml中配置，创建一个BeforeMethod类，一个新的代理命名为：bookProxy

1： target 设置你想拦截的bean

2：interceptorNames设置通知，你想作用于proxy/target上的

对应的配置文件如下：

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="book" class="com.myapp.core.aop.advice.Book">
<property name="name" value=http://www.mamicode.com/"Effective java" />
<property name="url" value=http://www.mamicode.com/"www.google.cn"/>
<property name="pages" value=http://www.mamicode.com/"300" />
</bean>
<bean id="beforeMethodBean" class="com.myapp.core.aop.advice.BeforeMethod" />
<bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="book"/>
<property name="interceptorNames">
<list>
<value>beforeMethodBean</value>
</list>
</property>
</bean>
</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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

  <!-- more bean definitions for data access objects go here -->
   
    <bean id="book" class="com.myapp.core.aop.advice.Book">
	    <property name="name" value="http://www.mamicode.com/Effective java" />
	    <property name="url" value="http://www.mamicode.com/www.google.cn"/>
	    <property name="pages" value="http://www.mamicode.com/300" />
    </bean>
    
    <bean id="beforeMethodBean" class="com.myapp.core.aop.advice.BeforeMethod" />
    
    <bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
     
     <property name="target" ref="book"/>
     
     <property name="interceptorNames">
       <list>
        <value>beforeMethodBean</value>
       </list>
     </property>
    
     </bean>
</beans>

注意：为了使用proxy（代理）我们需要引入 CGLIB2， pom.xml文件中注入如下：

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<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>2.2.2</version>
</dependency>

	<dependency>
		<groupId>cglib</groupId>
		<artifactId>cglib</artifactId>
		<version>2.2.2</version>
	</dependency>

运行测试类：

[java] view plain copy print?

package com.myapp.core.aop.advice;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainTest {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("resource/aop.xml");
Book book = (Book) context.getBean("bookProxy");
System.out.println("---------------------");
book.printName();
System.out.println("---------------------");
book.printUrl();
System.out.println("----------------------");
try{
book.printThrowException();
}catch(Exception e){
// e.printStackTrace();
}
}
}

package com.myapp.core.aop.advice;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainTest {
   public static void main(String[] args) {
	  
	   ApplicationContext  context  = new  ClassPathXmlApplicationContext("resource/aop.xml");
	   
	   Book   book  =   (Book) context.getBean("bookProxy");
	   
	   System.out.println("---------------------");
       
	   book.printName();
	   
	   System.out.println("---------------------");
	   
	   book.printUrl();
	   
	   System.out.println("----------------------");
	   
	   try{
		   
		  book.printThrowException();
		   
	   }catch(Exception e){
		 //  e.printStackTrace();
	   }
	   
	   
}
}

注意以上获得的是代理bean；

运行结果如下：

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三月 20, 2013 2:18:56 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb67e8: startup date [Wed Mar 20 14:18:55 CST 2013]; root of context hierarchy
三月 20, 2013 2:18:56 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [resource/aop.xml]
三月 20, 2013 2:18:57 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@157985: defining beans [book,beforeMethodBean,bookProxy]; root of factory hierarchy
---------------------
Before Method
--------------------
Book name Effective java
---------------------
Before Method
--------------------
Book URL www.google.cn
----------------------
Before Method
--------------------

三月 20, 2013 2:18:56 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb67e8: startup date [Wed Mar 20 14:18:55 CST 2013]; root of context hierarchy
三月 20, 2013 2:18:56 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [resource/aop.xml]
三月 20, 2013 2:18:57 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@157985: defining beans [book,beforeMethodBean,bookProxy]; root of factory hierarchy
---------------------
Before  Method
--------------------
Book name Effective java
---------------------
Before  Method
--------------------
Book URL www.google.cn
----------------------
Before  Method
--------------------

2： after advice

在方法运行返回结果后将执行这个 afterReturning方法，创建的这个类必须实现：AfterReturningAdvice接口

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package com.myapp.core.aop.advice;
import java.lang.reflect.Method;
import org.springframework.aop.AfterReturningAdvice;
public class AfterMethod implements AfterReturningAdvice {
@Override
public void afterReturning(Object arg0, Method arg1, Object[] arg2,
Object arg3) throws Throwable {
// TODO Auto-generated method stub
System.out.println("-------------------");
System.out.println("After method ");
}
}

package com.myapp.core.aop.advice;

import java.lang.reflect.Method;

import org.springframework.aop.AfterReturningAdvice;

public class AfterMethod  implements  AfterReturningAdvice {

	@Override
	public void afterReturning(Object arg0, Method arg1, Object[] arg2,
			Object arg3) throws Throwable {
		// TODO Auto-generated method stub
		
		System.out.println("-------------------");
		
		System.out.println("After  method ");
		
		
		
	}

}

xml配置文件：

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="book" class="com.myapp.core.aop.advice.Book">
<property name="name" value=http://www.mamicode.com/"Effective java" />
<property name="url" value=http://www.mamicode.com/"www.google.cn"/>
<property name="pages" value=http://www.mamicode.com/"300" />
</bean>
<bean id="beforeMethodBean" class="com.myapp.core.aop.advice.BeforeMethod" />
<bean id="afterMethodBean" class="com.myapp.core.aop.advice.AfterMethod" />
<bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="book"/>
<property name="interceptorNames">
<list>
<value>beforeMethodBean</value>
<value>afterMethodBean</value>
</list>
</property>
</bean>
</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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

  <!-- more bean definitions for data access objects go here -->
   
    <bean id="book" class="com.myapp.core.aop.advice.Book">
	    <property name="name" value="http://www.mamicode.com/Effective java" />
	    <property name="url" value="http://www.mamicode.com/www.google.cn"/>
	    <property name="pages" value="http://www.mamicode.com/300" />
    </bean>
    
    <bean id="beforeMethodBean" class="com.myapp.core.aop.advice.BeforeMethod" />
    
      <bean id="afterMethodBean" class="com.myapp.core.aop.advice.AfterMethod" />
    
    <bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
     
     <property name="target" ref="book"/>
     
     <property name="interceptorNames">
       <list>
        <value>beforeMethodBean</value>
        <value>afterMethodBean</value>
       </list>
     </property>
    
     </bean>
</beans>

运行结果如下：

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三月 20, 2013 2:22:19 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb67e8: startup date [Wed Mar 20 14:22:19 CST 2013]; root of context hierarchy
三月 20, 2013 2:22:19 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [resource/aop.xml]
三月 20, 2013 2:22:20 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@157985: defining beans [book,beforeMethodBean,afterMethodBean,bookProxy]; root of factory hierarchy
---------------------
Before Method
--------------------
Book name Effective java
-------------------
After method
---------------------
Before Method
--------------------
Book URL www.google.cn
-------------------
After method
----------------------
Before Method
--------------------

三月 20, 2013 2:22:19 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb67e8: startup date [Wed Mar 20 14:22:19 CST 2013]; root of context hierarchy
三月 20, 2013 2:22:19 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [resource/aop.xml]
三月 20, 2013 2:22:20 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@157985: defining beans [book,beforeMethodBean,afterMethodBean,bookProxy]; root of factory hierarchy
---------------------
Before  Method
--------------------
Book name Effective java
-------------------
After  method 
---------------------
Before  Method
--------------------
Book URL www.google.cn
-------------------
After  method 
----------------------
Before  Method
--------------------

3：after throwing advice

当方法执行抛出一个异常后，会执行这个方法，创建一个类实现：ThrowsAdvice接口，创建一个afterThrowing拦截：IllegalArgumentException异常。

类如下：

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package com.myapp.core.aop.advice;
import org.springframework.aop.ThrowsAdvice;
public class ThrowException implements ThrowsAdvice{
public void afterThrowing(IllegalArgumentException e) throws Throwable{
System.out.println("after Throwing Exception");
}
}

package com.myapp.core.aop.advice;

import org.springframework.aop.ThrowsAdvice;

public class ThrowException  implements ThrowsAdvice{
   
	public  void  afterThrowing(IllegalArgumentException e)  throws  Throwable{
		System.out.println("after Throwing  Exception");
	}
}

xml中配置文件如下：

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="book" class="com.myapp.core.aop.advice.Book">
<property name="name" value=http://www.mamicode.com/"Effective java" />
<property name="url" value=http://www.mamicode.com/"www.google.cn"/>
<property name="pages" value=http://www.mamicode.com/"300" />
</bean>
<bean id="beforeMethodBean" class="com.myapp.core.aop.advice.BeforeMethod" />
<bean id="afterMethodBean" class="com.myapp.core.aop.advice.AfterMethod" />
<bean id="throwException" class="com.myapp.core.aop.advice.ThrowException" />
<bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="book"/>
<property name="interceptorNames">
<list>
<value>beforeMethodBean</value>
<value>afterMethodBean</value>
<value>throwException</value>
</list>
</property>
</bean>
</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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

  <!-- more bean definitions for data access objects go here -->
   
    <bean id="book" class="com.myapp.core.aop.advice.Book">
	    <property name="name" value="http://www.mamicode.com/Effective java" />
	    <property name="url" value="http://www.mamicode.com/www.google.cn"/>
	    <property name="pages" value="http://www.mamicode.com/300" />
    </bean>
    
    <!-- before  advice -->
    <bean id="beforeMethodBean" class="com.myapp.core.aop.advice.BeforeMethod" />
    
    <!-- after  advice -->
      <bean id="afterMethodBean" class="com.myapp.core.aop.advice.AfterMethod" />
      
      <!-- throwing  advice -->
      
      <bean id="throwException" class="com.myapp.core.aop.advice.ThrowException" />
    
    <bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
     
     <property name="target" ref="book"/>
     
     <property name="interceptorNames">
       <list>
        <value>beforeMethodBean</value>
        <value>afterMethodBean</value>
        <value>throwException</value>
       </list>
     </property>
    
     </bean>
</beans>

执行结果如下：

[plain] view plain copy print?

三月 20, 2013 2:37:36 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb67e8: startup date [Wed Mar 20 14:37:36 CST 2013]; root of context hierarchy
三月 20, 2013 2:37:36 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [resource/aop.xml]
三月 20, 2013 2:37:36 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@157985: defining beans [book,beforeMethodBean,afterMethodBean,throwException,bookProxy]; root of factory hierarchy
---------------------
Before Method
--------------------
Book name Effective java
-------------------
After method
---------------------
Before Method
--------------------
Book URL www.google.cn
-------------------
After method
----------------------
Before Method
--------------------
after Throwing Exception

三月 20, 2013 2:37:36 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb67e8: startup date [Wed Mar 20 14:37:36 CST 2013]; root of context hierarchy
三月 20, 2013 2:37:36 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [resource/aop.xml]
三月 20, 2013 2:37:36 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@157985: defining beans [book,beforeMethodBean,afterMethodBean,throwException,bookProxy]; root of factory hierarchy
---------------------
Before  Method
--------------------
Book name Effective java
-------------------
After  method 
---------------------
Before  Method
--------------------
Book URL www.google.cn
-------------------
After  method 
----------------------
Before  Method
--------------------
after Throwing  Exception

4：Around advice

这个advice 联合了上面的三个advices，在方法执行期间执行，创建一个类实现MethodInterceptor接口，需要在方法中执行Object result = methodInvocation.proceed();方法才能得到执行，否则方法不会执行。

类如下：

[java] view plain copy print?

package com.myapp.core.aop.advice;
import java.util.Arrays;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
public class AroundMethod implements MethodInterceptor{
@Override
public Object invoke(MethodInvocation methodInvocation) throws Throwable {
// TODO Auto-generated method stub
System.out.println("method name:" + methodInvocation.getMethod().getName());
System.out.println("method arguments" + Arrays.toString(methodInvocation.getArguments()));
System.out.println("Around method : before ");
try{
Object result = methodInvocation.proceed();
System.out.println("Around method : after ");
return result;
}catch(IllegalArgumentException e){
System.out.println("Around method : throw an exception ");
throw e;
}
}
}

package com.myapp.core.aop.advice;

import java.util.Arrays;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

public class AroundMethod  implements MethodInterceptor{

	@Override
	public Object invoke(MethodInvocation methodInvocation) throws Throwable {
		// TODO Auto-generated method stub
		
		System.out.println("method  name:" + methodInvocation.getMethod().getName());
		
		System.out.println("method  arguments" + Arrays.toString(methodInvocation.getArguments()));
		
		System.out.println("Around  method : before ");
		
		try{
			
			Object result = methodInvocation.proceed();
			
			System.out.println("Around method : after ");
			return  result;
			
		}catch(IllegalArgumentException e){
			
			System.out.println("Around method : throw  an  exception ");
			throw  e;
		}
	}

}

配置文件如下：

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="book" class="com.myapp.core.aop.advice.Book">
<property name="name" value=http://www.mamicode.com/"Effective java" />
<property name="url" value=http://www.mamicode.com/"www.google.cn"/>
<property name="pages" value=http://www.mamicode.com/"300" />
</bean>
<bean id="aroundMethod" class="com.myapp.core.aop.advice.AroundMethod" />
<bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean" >
<property name="target" ref="book"/>
<property name="interceptorNames">
<list>
<value>aroundMethod</value>
</list>
</property>
</bean>
</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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

  <!-- more bean definitions for data access objects go here -->
   
    <bean id="book" class="com.myapp.core.aop.advice.Book">
	    <property name="name" value="http://www.mamicode.com/Effective java" />
	    <property name="url" value="http://www.mamicode.com/www.google.cn"/>
	    <property name="pages" value="http://www.mamicode.com/300" />
    </bean>
  
    <bean id="aroundMethod"  class="com.myapp.core.aop.advice.AroundMethod" />
    
    <bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean" >
     <property name="target" ref="book"/>
     
     <property name="interceptorNames">
       <list>
    
         <value>aroundMethod</value>
       </list>
     </property>
    
     </bean>
</beans>

测试结果：

[plain] view plain copy print?

三月 20, 2013 3:02:19 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb67e8: startup date [Wed Mar 20 15:02:19 CST 2013]; root of context hierarchy
三月 20, 2013 3:02:19 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [resource/aop.xml]
三月 20, 2013 3:02:19 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@e29127: defining beans [book,aroundMethod,bookProxy]; root of factory hierarchy
---------------------
method name:printName
method arguments[]
Around method : before
Book name Effective java
Around method : after
---------------------
method name:printUrl
method arguments[]
Around method : before
Book URL www.google.cn
Around method : after
----------------------
method name:printThrowException
method arguments[]
Around method : before
Around method : throw an exception

三月 20, 2013 3:02:19 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb67e8: startup date [Wed Mar 20 15:02:19 CST 2013]; root of context hierarchy
三月 20, 2013 3:02:19 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [resource/aop.xml]
三月 20, 2013 3:02:19 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@e29127: defining beans [book,aroundMethod,bookProxy]; root of factory hierarchy
---------------------
method  name:printName
method  arguments[]
Around  method : before 
Book name Effective java
Around method : after 
---------------------
method  name:printUrl
method  arguments[]
Around  method : before 
Book URL www.google.cn
Around method : after 
----------------------
method  name:printThrowException
method  arguments[]
Around  method : before 
Around method : throw  an  exception

around advice得到实现。 over

Spring AOP 中 advice 的四种类型 before after throwing advice around

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