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

    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：

    [java] view plain copy print?
    1. package com.myapp.core.aop.advice;  
    2.   
    3. public class Book {  
    4.    private  String  name;  
    5.    private  String  url;  
    6.    private   int    pages;  
    7.      
    8.     public String getName() {  
    9.         return name;  
    10.     }  
    11.     public void setName(String name) {  
    12.         this.name = name;  
    13.     }  
    14.     public String getUrl() {  
    15.         return url;  
    16.     }  
    17.     public void setUrl(String url) {  
    18.         this.url = url;  
    19.     }  
    20.     public int getPages() {  
    21.         return pages;  
    22.     }  
    23.     public void setPages(int pages) {  
    24.         this.pages = pages;  
    25.     }  
    26.   
    27.   
    28.     public  void  printName(){  
    29.         System.out.println("Book name "+ this.name);  
    30.     }  
    31.       
    32.     public  void  printUrl(){  
    33.         System.out.println("Book URL "+this.url);  
    34.     }  
    35.       
    36.     public  void  printThrowException(){  
    37.         throw  new  IllegalArgumentException();  
    38.     }  
    39.      
    40. }  
    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：

    [html] 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.        xsi:schemaLocation="http://www.springframework.org/schema/beans  
    5.            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">  
    6.   
    7.   <!-- more bean definitions for data access objects go here -->  
    8.      
    9.     <bean id="book" class="com.myapp.core.aop.advice.Book">  
    10.         <property name="name" value="Effective java" />  
    11.         <property name="url" value="www.google.cn"/>  
    12.         <property name="pages" value="300" />  
    13.     </bean>  
    14. </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="Effective java" />
	    <property name="url" value="www.google.cn"/>
	    <property name="pages" value="300" />
    </bean>
</beans>

    对应的测试类：

    [java] view plain copy print?
    1. package com.myapp.core.aop.advice;  
    2.   
    3. import org.springframework.context.ApplicationContext;  
    4. import org.springframework.context.support.ClassPathXmlApplicationContext;  
    5.   
    6. public class MainTest {  
    7.    public static void main(String[] args) {  
    8.         
    9.        ApplicationContext  context  = new  ClassPathXmlApplicationContext("resource/aop.xml");  
    10.          
    11.        Book   book  =   (Book) context.getBean("book");  
    12.          
    13.        System.out.println("---------------------");  
    14.          
    15.        book.printName();  
    16.          
    17.        System.out.println("---------------------");  
    18.          
    19.        book.printUrl();  
    20.          
    21.        System.out.println("----------------------");  
    22.          
    23.        try{  
    24.              
    25.           book.printThrowException();  
    26.              
    27.        }catch(Exception e){  
    28.          //  e.printStackTrace();  
    29.        }  
    30.          
    31.          
    32. }  
    33. }  
    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：

    [plain] view plain copy print?
    1. 三月 20, 2013 11:01:01 上午 org.springframework.context.support.AbstractApplicationContext prepareRefresh  
    2. INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@11e831: startup date [Wed Mar 20 11:01:01 CST 2013]; root of context hierarchy  
    3. 三月 20, 2013 11:01:01 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions  
    4. INFO: Loading XML bean definitions from class path resource [resource/aop.xml]  
    5. 三月 20, 2013 11:01:01 上午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons  
    6. INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@13b5500: defining beans [book]; root of factory hierarchy  
    7. ---------------------  
    8. Book name Effective java  
    9. ---------------------  
    10. Book URL www.google.cn  
    11. ----------------------  
    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：
    [java] view plain copy print?
    1. package com.myapp.core.aop.advice;  
    2.   
    3. import java.lang.reflect.Method;  
    4.   
    5. import org.springframework.aop.MethodBeforeAdvice;  
    6.   
    7. public class BeforeMethod  implements MethodBeforeAdvice {  
    8.   
    9.     @Override  
    10.     public void before(Method arg0, Object[] arg1, Object arg2)  
    11.             throws Throwable {  
    12.         // TODO Auto-generated method stub  
    13.           
    14.         System.out.println("Before  Method");  
    15.         System.out.println("--------------------");  
    16.           
    17.     }  
    18.    
    19. }  
    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：
    [html] 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.        xsi:schemaLocation="http://www.springframework.org/schema/beans  
    5.            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">  
    6.   
    7.   <!-- more bean definitions for data access objects go here -->  
    8.      
    9.     <bean id="book" class="com.myapp.core.aop.advice.Book">  
    10.         <property name="name" value="Effective java" />  
    11.         <property name="url" value="www.google.cn"/>  
    12.         <property name="pages" value="300" />  
    13.     </bean>  
    14.       
    15.     <bean id="beforeMethodBean" class="com.myapp.core.aop.advice.BeforeMethod" />  
    16.       
    17.     <bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean">  
    18.        
    19.      <property name="target" ref="book"/>  
    20.        
    21.      <property name="interceptorNames">  
    22.        <list>  
    23.         <value>beforeMethodBean</value>  
    24.        </list>  
    25.      </property>  
    26.       
    27.      </bean>  
    28. </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="Effective java" />
	    <property name="url" value="www.google.cn"/>
	    <property name="pages" value="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：
    [html] view plain copy print?
    1. <dependency>  
    2.     <groupId>cglib</groupId>  
    3.     <artifactId>cglib</artifactId>  
    4.     <version>2.2.2</version>  
    5. </dependency>  
    	<dependency>
		<groupId>cglib</groupId>
		<artifactId>cglib</artifactId>
		<version>2.2.2</version>
	</dependency>
    运行测试类：
    [java] view plain copy print?
    1. package com.myapp.core.aop.advice;  
    2.   
    3. import org.springframework.context.ApplicationContext;  
    4. import org.springframework.context.support.ClassPathXmlApplicationContext;  
    5.   
    6. public class MainTest {  
    7.    public static void main(String[] args) {  
    8.         
    9.        ApplicationContext  context  = new  ClassPathXmlApplicationContext("resource/aop.xml");  
    10.          
    11.        Book   book  =   (Book) context.getBean("bookProxy");  
    12.          
    13.        System.out.println("---------------------");  
    14.          
    15.        book.printName();  
    16.          
    17.        System.out.println("---------------------");  
    18.          
    19.        book.printUrl();  
    20.          
    21.        System.out.println("----------------------");  
    22.          
    23.        try{  
    24.              
    25.           book.printThrowException();  
    26.              
    27.        }catch(Exception e){  
    28.          //  e.printStackTrace();  
    29.        }  
    30.          
    31.          
    32. }  
    33. }  
    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：
    [plain] view plain copy print?
    1. 三月 20, 2013 2:18:56 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh  
    2. INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb67e8: startup date [Wed Mar 20 14:18:55 CST 2013]; root of context hierarchy  
    3. 三月 20, 2013 2:18:56 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions  
    4. INFO: Loading XML bean definitions from class path resource [resource/aop.xml]  
    5. 三月 20, 2013 2:18:57 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons  
    6. INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@157985: defining beans [book,beforeMethodBean,bookProxy]; root of factory hierarchy  
    7. ---------------------  
    8. Before  Method  
    9. --------------------  
    10. Book name Effective java  
    11. ---------------------  
    12. Before  Method  
    13. --------------------  
    14. Book URL www.google.cn  
    15. ----------------------  
    16. Before  Method  
    17. --------------------  
    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
    [java] view plain copy print?
    1. package com.myapp.core.aop.advice;  
    2.   
    3. import java.lang.reflect.Method;  
    4.   
    5. import org.springframework.aop.AfterReturningAdvice;  
    6.   
    7. public class AfterMethod  implements  AfterReturningAdvice {  
    8.   
    9.     @Override  
    10.     public void afterReturning(Object arg0, Method arg1, Object[] arg2,  
    11.             Object arg3) throws Throwable {  
    12.         // TODO Auto-generated method stub  
    13.           
    14.         System.out.println("-------------------");  
    15.           
    16.         System.out.println("After  method ");  
    17.           
    18.           
    19.           
    20.     }  
    21.   
    22. }  
    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：
    [html] 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.        xsi:schemaLocation="http://www.springframework.org/schema/beans  
    5.            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">  
    6.   
    7.   <!-- more bean definitions for data access objects go here -->  
    8.      
    9.     <bean id="book" class="com.myapp.core.aop.advice.Book">  
    10.         <property name="name" value="Effective java" />  
    11.         <property name="url" value="www.google.cn"/>  
    12.         <property name="pages" value="300" />  
    13.     </bean>  
    14.       
    15.     <bean id="beforeMethodBean" class="com.myapp.core.aop.advice.BeforeMethod" />  
    16.       
    17.       <bean id="afterMethodBean" class="com.myapp.core.aop.advice.AfterMethod" />  
    18.       
    19.     <bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean">  
    20.        
    21.      <property name="target" ref="book"/>  
    22.        
    23.      <property name="interceptorNames">  
    24.        <list>  
    25.         <value>beforeMethodBean</value>  
    26.         <value>afterMethodBean</value>  
    27.        </list>  
    28.      </property>  
    29.       
    30.      </bean>  
    31. </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="Effective java" />
	    <property name="url" value="www.google.cn"/>
	    <property name="pages" value="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：
    [plain] view plain copy print?
    1. 三月 20, 2013 2:22:19 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh  
    2. INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb67e8: startup date [Wed Mar 20 14:22:19 CST 2013]; root of context hierarchy  
    3. 三月 20, 2013 2:22:19 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions  
    4. INFO: Loading XML bean definitions from class path resource [resource/aop.xml]  
    5. 三月 20, 2013 2:22:20 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons  
    6. INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@157985: defining beans [book,beforeMethodBean,afterMethodBean,bookProxy]; root of factory hierarchy  
    7. ---------------------  
    8. Before  Method  
    9. --------------------  
    10. Book name Effective java  
    11. -------------------  
    12. After  method   
    13. ---------------------  
    14. Before  Method  
    15. --------------------  
    16. Book URL www.google.cn  
    17. -------------------  
    18. After  method   
    19. ----------------------  
    20. Before  Method  
    21. --------------------  
    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：
    [java] view plain copy print?
    1. package com.myapp.core.aop.advice;  
    2.   
    3. import org.springframework.aop.ThrowsAdvice;  
    4.   
    5. public class ThrowException  implements ThrowsAdvice{  
    6.      
    7.     public  void  afterThrowing(IllegalArgumentException e)  throws  Throwable{  
    8.         System.out.println("after Throwing  Exception");  
    9.     }  
    10. }  
    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：
    [html] 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.        xsi:schemaLocation="http://www.springframework.org/schema/beans  
    5.            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">  
    6.   
    7.   <!-- more bean definitions for data access objects go here -->  
    8.      
    9.     <bean id="book" class="com.myapp.core.aop.advice.Book">  
    10.         <property name="name" value="Effective java" />  
    11.         <property name="url" value="www.google.cn"/>  
    12.         <property name="pages" value="300" />  
    13.     </bean>  
    14.       
    15.     <!-- before  advice -->  
    16.     <bean id="beforeMethodBean" class="com.myapp.core.aop.advice.BeforeMethod" />  
    17.       
    18.     <!-- after  advice -->  
    19.       <bean id="afterMethodBean" class="com.myapp.core.aop.advice.AfterMethod" />  
    20.         
    21.       <!-- throwing  advice -->  
    22.         
    23.       <bean id="throwException" class="com.myapp.core.aop.advice.ThrowException" />  
    24.       
    25.     <bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean">  
    26.        
    27.      <property name="target" ref="book"/>  
    28.        
    29.      <property name="interceptorNames">  
    30.        <list>  
    31.         <value>beforeMethodBean</value>  
    32.         <value>afterMethodBean</value>  
    33.         <value>throwException</value>  
    34.        </list>  
    35.      </property>  
    36.       
    37.      </bean>  
    38. </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="Effective java" />
	    <property name="url" value="www.google.cn"/>
	    <property name="pages" value="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?
    1. 三月 20, 2013 2:37:36 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh  
    2. INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb67e8: startup date [Wed Mar 20 14:37:36 CST 2013]; root of context hierarchy  
    3. 三月 20, 2013 2:37:36 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions  
    4. INFO: Loading XML bean definitions from class path resource [resource/aop.xml]  
    5. 三月 20, 2013 2:37:36 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons  
    6. INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@157985: defining beans [book,beforeMethodBean,afterMethodBean,throwException,bookProxy]; root of factory hierarchy  
    7. ---------------------  
    8. Before  Method  
    9. --------------------  
    10. Book name Effective java  
    11. -------------------  
    12. After  method   
    13. ---------------------  
    14. Before  Method  
    15. --------------------  
    16. Book URL www.google.cn  
    17. -------------------  
    18. After  method   
    19. ----------------------  
    20. Before  Method  
    21. --------------------  
    22. 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?
    1. package com.myapp.core.aop.advice;  
    2.   
    3. import java.util.Arrays;  
    4.   
    5. import org.aopalliance.intercept.MethodInterceptor;  
    6. import org.aopalliance.intercept.MethodInvocation;  
    7.   
    8. public class AroundMethod  implements MethodInterceptor{  
    9.   
    10.     @Override  
    11.     public Object invoke(MethodInvocation methodInvocation) throws Throwable {  
    12.         // TODO Auto-generated method stub  
    13.           
    14.         System.out.println("method  name:" + methodInvocation.getMethod().getName());  
    15.           
    16.         System.out.println("method  arguments" + Arrays.toString(methodInvocation.getArguments()));  
    17.           
    18.         System.out.println("Around  method : before ");  
    19.           
    20.         try{  
    21.               
    22.             Object result = methodInvocation.proceed();  
    23.               
    24.             System.out.println("Around method : after ");  
    25.             return  result;  
    26.               
    27.         }catch(IllegalArgumentException e){  
    28.               
    29.             System.out.println("Around method : throw  an  exception ");  
    30.             throw  e;  
    31.         }  
    32.     }  
    33.   
    34. }  
    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：
    [html] 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.        xsi:schemaLocation="http://www.springframework.org/schema/beans  
    5.            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">  
    6.   
    7.   <!-- more bean definitions for data access objects go here -->  
    8.      
    9.     <bean id="book" class="com.myapp.core.aop.advice.Book">  
    10.         <property name="name" value="Effective java" />  
    11.         <property name="url" value="www.google.cn"/>  
    12.         <property name="pages" value="300" />  
    13.     </bean>  
    14.     
    15.     <bean id="aroundMethod"  class="com.myapp.core.aop.advice.AroundMethod" />  
    16.       
    17.     <bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean" >  
    18.      <property name="target" ref="book"/>  
    19.        
    20.      <property name="interceptorNames">  
    21.        <list>  
    22.       
    23.          <value>aroundMethod</value>  
    24.        </list>  
    25.      </property>  
    26.       
    27.      </bean>  
    28. </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="Effective java" />
	    <property name="url" value="www.google.cn"/>
	    <property name="pages" value="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?
    1. 三月 20, 2013 3:02:19 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh  
    2. INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@eb67e8: startup date [Wed Mar 20 15:02:19 CST 2013]; root of context hierarchy  
    3. 三月 20, 2013 3:02:19 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions  
    4. INFO: Loading XML bean definitions from class path resource [resource/aop.xml]  
    5. 三月 20, 2013 3:02:19 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons  
    6. INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@e29127: defining beans [book,aroundMethod,bookProxy]; root of factory hierarchy  
    7. ---------------------  
    8. method  name:printName  
    9. method  arguments[]  
    10. Around  method : before   
    11. Book name Effective java  
    12. Around method : after   
    13. ---------------------  
    14. method  name:printUrl  
    15. method  arguments[]  
    16. Around  method : before   
    17. Book URL www.google.cn  
    18. Around method : after   
    19. ----------------------  
    20. method  name:printThrowException  
    21. method  arguments[]  
    22. Around  method : before   
    23. 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
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  • 原文地址：https://www.cnblogs.com/mochaMM/p/6932735.html
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