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

2021-10-21 09:50:40

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：

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

  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. <!-- more bean definitions for data access objects go here -->
  7. <bean id="book" class="com.myapp.core.aop.advice.Book">
  8. <property name="name" value="Effective java" />
  9. <property name="url" value="www.google.cn"/>
  10. <property name="pages" value="300" />
  11. </bean>
  12. </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：

  1. package com.myapp.core.aop.advice;
  2. import org.springframework.context.ApplicationContext;
  3. import org.springframework.context.support.ClassPathXmlApplicationContext;
  4. public class MainTest {
  5. public static void main(String[] args) {
  6. ApplicationContext  context  = new  ClassPathXmlApplicationContext("resource/aop.xml");
  7. Book   book  =   (Book) context.getBean("book");
  8. System.out.println("---------------------");
  9. book.printName();
  10. System.out.println("---------------------");
  11. book.printUrl();
  12. System.out.println("----------------------");
  13. try{
  14. book.printThrowException();
  15. }catch(Exception e){
  16. //  e.printStackTrace();
  17. }
  18. }
  19. }
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：

  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：
  1. package com.myapp.core.aop.advice;
  2. import java.lang.reflect.Method;
  3. import org.springframework.aop.MethodBeforeAdvice;
  4. public class BeforeMethod  implements MethodBeforeAdvice {
  5. @Override
  6. public void before(Method arg0, Object[] arg1, Object arg2)
  7. throws Throwable {
  8. // TODO Auto-generated method stub
  9. System.out.println("Before  Method");
  10. System.out.println("--------------------");
  11. }
  12. }
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：
  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. <!-- more bean definitions for data access objects go here -->
  7. <bean id="book" class="com.myapp.core.aop.advice.Book">
  8. <property name="name" value="Effective java" />
  9. <property name="url" value="www.google.cn"/>
  10. <property name="pages" value="300" />
  11. </bean>
  12. <bean id="beforeMethodBean" class="com.myapp.core.aop.advice.BeforeMethod" />
  13. <bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
  14. <property name="target" ref="book"/>
  15. <property name="interceptorNames">
  16. <list>
  17. <value>beforeMethodBean</value>
  18. </list>
  19. </property>
  20. </bean>
  21. </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：

  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：

  1. package com.myapp.core.aop.advice;
  2. import org.springframework.context.ApplicationContext;
  3. import org.springframework.context.support.ClassPathXmlApplicationContext;
  4. public class MainTest {
  5. public static void main(String[] args) {
  6. ApplicationContext  context  = new  ClassPathXmlApplicationContext("resource/aop.xml");
  7. Book   book  =   (Book) context.getBean("bookProxy");
  8. System.out.println("---------------------");
  9. book.printName();
  10. System.out.println("---------------------");
  11. book.printUrl();
  12. System.out.println("----------------------");
  13. try{
  14. book.printThrowException();
  15. }catch(Exception e){
  16. //  e.printStackTrace();
  17. }
  18. }
  19. }
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：
  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
  1. package com.myapp.core.aop.advice;
  2. import java.lang.reflect.Method;
  3. import org.springframework.aop.AfterReturningAdvice;
  4. public class AfterMethod  implements  AfterReturningAdvice {
  5. @Override
  6. public void afterReturning(Object arg0, Method arg1, Object[] arg2,
  7. Object arg3) throws Throwable {
  8. // TODO Auto-generated method stub
  9. System.out.println("-------------------");
  10. System.out.println("After  method ");
  11. }
  12. }
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：

  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. <!-- more bean definitions for data access objects go here -->
  7. <bean id="book" class="com.myapp.core.aop.advice.Book">
  8. <property name="name" value="Effective java" />
  9. <property name="url" value="www.google.cn"/>
  10. <property name="pages" value="300" />
  11. </bean>
  12. <bean id="beforeMethodBean" class="com.myapp.core.aop.advice.BeforeMethod" />
  13. <bean id="afterMethodBean" class="com.myapp.core.aop.advice.AfterMethod" />
  14. <bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
  15. <property name="target" ref="book"/>
  16. <property name="interceptorNames">
  17. <list>
  18. <value>beforeMethodBean</value>
  19. <value>afterMethodBean</value>
  20. </list>
  21. </property>
  22. </bean>
  23. </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：

  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：
  1. package com.myapp.core.aop.advice;
  2. import org.springframework.aop.ThrowsAdvice;
  3. public class ThrowException  implements ThrowsAdvice{
  4. public  void  afterThrowing(IllegalArgumentException e)  throws  Throwable{
  5. System.out.println("after Throwing  Exception");
  6. }
  7. }
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：

  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. <!-- more bean definitions for data access objects go here -->
  7. <bean id="book" class="com.myapp.core.aop.advice.Book">
  8. <property name="name" value="Effective java" />
  9. <property name="url" value="www.google.cn"/>
  10. <property name="pages" value="300" />
  11. </bean>
  12. <!-- before  advice -->
  13. <bean id="beforeMethodBean" class="com.myapp.core.aop.advice.BeforeMethod" />
  14. <!-- after  advice -->
  15. <bean id="afterMethodBean" class="com.myapp.core.aop.advice.AfterMethod" />
  16. <!-- throwing  advice -->
  17. <bean id="throwException" class="com.myapp.core.aop.advice.ThrowException" />
  18. <bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
  19. <property name="target" ref="book"/>
  20. <property name="interceptorNames">
  21. <list>
  22. <value>beforeMethodBean</value>
  23. <value>afterMethodBean</value>
  24. <value>throwException</value>
  25. </list>
  26. </property>
  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>

    <!-- 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：

  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：
  1. package com.myapp.core.aop.advice;
  2. import java.util.Arrays;
  3. import org.aopalliance.intercept.MethodInterceptor;
  4. import org.aopalliance.intercept.MethodInvocation;
  5. public class AroundMethod  implements MethodInterceptor{
  6. @Override
  7. public Object invoke(MethodInvocation methodInvocation) throws Throwable {
  8. // TODO Auto-generated method stub
  9. System.out.println("method  name:" + methodInvocation.getMethod().getName());
  10. System.out.println("method  arguments" + Arrays.toString(methodInvocation.getArguments()));
  11. System.out.println("Around  method : before ");
  12. try{
  13. Object result = methodInvocation.proceed();
  14. System.out.println("Around method : after ");
  15. return  result;
  16. }catch(IllegalArgumentException e){
  17. System.out.println("Around method : throw  an  exception ");
  18. throw  e;
  19. }
  20. }
  21. }
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：

  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. <!-- more bean definitions for data access objects go here -->
  7. <bean id="book" class="com.myapp.core.aop.advice.Book">
  8. <property name="name" value="Effective java" />
  9. <property name="url" value="www.google.cn"/>
  10. <property name="pages" value="300" />
  11. </bean>
  12. <bean id="aroundMethod"  class="com.myapp.core.aop.advice.AroundMethod" />
  13. <bean id="bookProxy" class="org.springframework.aop.framework.ProxyFactoryBean" >
  14. <property name="target" ref="book"/>
  15. <property name="interceptorNames">
  16. <list>
  17. <value>aroundMethod</value>
  18. </list>
  19. </property>
  20. </bean>
  21. </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：

  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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