Spring AOP基于注解的AfterThrowing

@AfterThrowing是一种通知类型，可以确保在方法抛出异常时运行一个通知。 以下是@AfterThrowing通知的语法：

语法

@AfterThrowing(pointcut="execution(* com.zyiz.Student.*(..))", throwing= "error")
public void afterThrowingAdvice(JoinPoint jp, Throwable error){
   System.out.println("Method Signature: "  + jp.getSignature());  
   System.out.println("Exception: "+error);  
}

在上面的语法示例中 -

• @AfterReturning - 如果方法返回成功，则将函数标记为在切入点覆盖的方法之前执行的通知。
• @Pointcut - 将函数标记为切入点
• @After - 将函数标记为在切入点覆盖的方法之后执行的通知。
• execution( expression ) - 涵盖应用通知的方法的表达式。
• throwing - 返回的异常名称。

要了解上面提到的@AfterThrowing通知相关的概念，我们写一个Spring AOP基于注解的应用例子，它将使用基于注解配置实现通知。打开并使用Eclipse IDE，并按照以下步骤创建一个Spring应用程序：

1. 更新在Spring AOP应用实例中创建过的Student项目。
2. 更新bean配置并运行应用程序，如下所述。

整个项目的目录结构如下所示 -

下面是Logging.java文件的内容。 这实际上是一个Aspect模块的样本，它定义了在各个点被调用的方法。

package com.zyiz;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.JoinPoint;  
import org.aspectj.lang.annotation.AfterThrowing;  

@Aspect
public class Logging {

   /** 
    * This is the method which I would like to execute
    * after a selected method execution throws exception.
    */
   @AfterThrowing(pointcut="execution(* com.zyiz.Student.*(..))", throwing= "error")
   public void afterThrowingAdvice(JoinPoint jp, Throwable error){
      System.out.println("[afterThrowingAdvice] Method Signature: "  + jp.getSignature());  
      System.out.println("[afterThrowingAdvice] Exception: "+error);  
   }
}

以下是Student.java文件的内容：

package com.zyiz;

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

public class MainApp {
   public static void main(String[] args) {
      ApplicationContext context = 
             new ClassPathXmlApplicationContext("Beans.xml");

      Student student = (Student) context.getBean("student");

      student.printThrowException();     
   }
}

以下是MainApp.java文件的内容：

package com.zyiz;

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

public class MainApp {
   public static void main(String[] args) {
      ApplicationContext context = 
             new ClassPathXmlApplicationContext("Beans.xml");

      Student student = (Student) context.getBean("student");

      student.printThrowException();     
   }
}

以下是配置文件Beans.xml文件的内容：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd ">

   <aop:aspectj-autoproxy/>

   <!-- Definition for student bean -->
   <bean id="student" class="com.zyiz.Student">
      <property name="name"  value="minsu" />
      <property name="age"  value="24"/>      
   </bean>

   <!-- Definition for logging aspect -->
   <bean id="logging" class="com.zyiz.Logging"/> 

</beans>

运行项目

完成创建源代码和配置文件后，运行应用程序。右键单击应用程序中的MainApp.java，并使用运行方式作为Java应用程序命令。 如果您的应用程序一切正常，这将打印以下消息：

Exception raised
[afterThrowingAdvice] Method Signature: void com.zyiz.Student.printThrowException()
[afterThrowingAdvice] Exception: java.lang.IllegalArgumentException
Exception in thread "main" java.lang.IllegalArgumentException
    at com.zyiz.Student.printThrowException(Student.java:25)
    at com.zyiz.Student$$FastClassBySpringCGLIB$$e9280b4b.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:58)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653)
    at com.zyiz.Student$$EnhancerBySpringCGLIB$$bb5ffc0.printThrowException(<generated>)
    at com.zyiz.MainApp.main(MainApp.java:16)