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📜  Spring AOP-投掷建议后基于XML的

📅  最后修改于: 2020-11-11 05:19:55             🧑  作者: Mango

后投掷是保证了方法执行之后，一个建议的运行，只有当方法退出通过抛出异常的通知类型。以下是抛出建议的语法。

句法

哪里，

  • PointCut-id – PointCut的ID 。

  • ex-抛出异常。

  • 当调用的函数抛出一个异常，并退出被调用函数的方法名称-方法名。

为了理解与“投掷后建议”相关的上述概念，让我们编写一个示例，该示例将实现“投掷后建议”。为了在没有任何建议的情况下编写示例，请让我们准备好运行的Eclipse IDE，并使用以下步骤创建Spring应用程序-

Step Description
1 Update the project Student created under chapter Spring AOP – Application.
2 Update the bean configuration and run the application as explained below.

以下是Logging.java文件的内容。这实际上是Aspect模块的示例，它定义了要在各个点调用的方法。

package com.tutorialspoint;

public class Logging {
   /**
    * This is the method which I would like to execute
    * if there is an exception raised.
    */
   public void afterThrowingAdvice(IllegalArgumentException ex) {
      System.out.println("There has been an exception: " + ex.toString());   
   } 
}

以下是Student.java文件的内容。

package com.tutorialspoint;

public class Student {
   private Integer age;
   private String name;

   public void setAge(Integer age) {
      this.age = age;
   }
   public Integer getAge() {
      System.out.println("Age : " + age );
      return age;
   }

   public void setName(String name) {
      this.name = name;
   }
   
   public String getName() {
      System.out.println("Name : " + name );
      return name;
   }
   
   public void printThrowException(){
      System.out.println("Exception raised");
      throw new IllegalArgumentException();
   }
}

以下是MainApp.java文件的内容。

package com.tutorialspoint;

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 。

运行项目

完成创建源文件和配置文件后，运行您的应用程序。右键单击应用程序中的MainApp.java，然后使用“以Java应用程序身份运行”命令。如果您的应用程序一切正常，它将打印以下消息。

Exception raised
There has been an exception: java.lang.IllegalArgumentException
Exception in thread "main" java.lang.IllegalArgumentException
   at com.tutorialspoint.Student.printThrowException(Student.java:25)
    
   at com.tutorialspoint.Student$$FastClassBySpringCGLIB$$7dc55815.invoke(>)
    
   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.tutorialspoint.Student$$EnhancerBySpringCGLIB$$8514cd8.printThrowException()
    
   at com.tutorialspoint.MainApp.main(MainApp.java:15)