Simple example of "spring-aop-Learning note-6" @AfterThrowing enhancement processing

Project structure

Business code @Component("Hello") public class Helloimpl implements Hello { //Define a simple method to simulate the business logic approach in the application Public void foo ()    {System. Out. println ("foo () method to execute Hello component");     } //define a AddUser () method to simulate the method of adding users in the app Public int addUser (string name, String pass)    {System. Out. println ("Execute the adduser add user for Hello component:" + name); If(Name.length () < 3 | | name.length () >)        {            throw new illegalargumentexception ("the name parameter must be longer than 3, less than 10!") ");        } return ;    }}
@Component("World") public class Worldimpl implements World{ //Define a simple method to simulate the business logic approach in the application Public void bar ()    {System. Out. println ("bar () method to execute World component");     }}

Defining Slice BeansDescription:If the type of ex is nullpointer-exception, only the exception of that type is matched;

  
 

   
  

  
@Aspect
   
  

  
public class RepairAspect
   
  

  
{
   
  

  
// 匹配org.crazyit.app.service.impl包下所有类的、
   
  

  
// 所有方法的执行作为切入点
   
  

  
@AfterThrowing(throwing="ex"
   
  

  
, pointcut="execution(* org.crazyit.app.service.impl.*.*(..))")
   
  

  
// 声明ex时指定的类型会限制目标方法必须抛出指定类型的异常
   
  

  
// 此处将ex的类型声明为Throwable，意味着对目标方法抛出的异常不加限制
   
  

  
public void doRecoveryActions(Throwable ex)
   
  

  
{
   
  

  
System.out.println("目标方法中抛出的异常:" + ex);
   
  

  
System.out.println("模拟Advice对异常的修复...");
   
  

  
}
   
  

  
}
  
 

Configuration <? XML version="1.0" encoding="GBK"?> <beans xmlns="Http://www.springframework.org/schema/beans" xmlns:xsi="Http://www.w3.org/2001/XMLSchema-instance" Xmlns:context="Http://www.springframework.org/schema/context" XMLNS:AOP="Http://www.springframework.org/schema/aop" xsi:schemalocation="Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsdHttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-4.0.xsdHTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOPhttp://www.springframework.org/schema/aop/spring-aop-4.0.xsd "> <!--specify automatic search for bean components, automatic search of slice classes -- <context:component-scan base-package="Org.crazyit.app.service , Org.crazyit.app.aspect "> <context:include-filter type="annotation" Expression="Org.aspectj.lang.annotation.Aspect"/> </context:component-scan> <!--start @aspectj support -- <aop:aspectj-autoproxy/> </Beans>


Test public class beantest {Public static void main (string[] args)    { //Create a spring container ApplicationContext ctx = new Classpathxmlapplicationcontext ("Beans.xml");Hello hello = ctx.getbean ("Hello" , hello. Class);Hello.foo ();       Hello.adduser ("Goku", "7788");//Throws an exception--the length of the name is not enoughWorld World = Ctx.getbean (' World ' , world. Class);World.bar ();    }}
Note: As can be seen from the above, although afterthrowing can handle the exception of the target method, this processing method differs from the direct use of catch capture, as follows:

• Catch: means that the exception is fully handled, and if no new exception is re-thrown in the catch statement, the method can end normally;
  
• Afterthrowing: Although the exception is handled, it cannot handle the exception completely, and the exception is still propagated to the caller at the previous level.
  

From for notes (Wiz)

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Simple example of "spring-aop-Learning note-6" @AfterThrowing enhancement processing