Spring AOP基于XML的应用程序

从这篇文章开始，我们使用Spring-AOP框架编写实际的AOP应用程序。在开始使用Spring-WS框架编写第一个示例之前，必须确保已经按照Spring AOP安装配置教程中的说明正确设置了Spring-AOP开发运行环境。

现在我们继续来编写一个简单的基于控制台的Spring AOP应用程序，它用于演示AOP的概念。

先来看看要创建的项目的目录结构 -

创建项目

打开命令控制台，进入D:\MVN目录并执行下面的mvn命令。

D:\MVN> mvn archetype:generate -DgroupId=com.zyiz -DartifactId=Student -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

上面命令执行后，Maven将开始处理，并将创建完整的java应用程序项目结构。您可能会看到一堆下载的东西，但是不要惊慌，耐心等待下载和构建完成，如下所示 -

Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/archetypes/maven-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.jar (5 KB at 7.7 KB/sec)
[INFO] ----------------------------------------------------------------------------
[INFO] Using following parameters for creating project from Old (1.x) Archetype: maven-archetype-quickstart:1.0
[INFO] ----------------------------------------------------------------------------
[INFO] Parameter: basedir, Value: D:\mvn
[INFO] Parameter: package, Value: com.zyiz
[INFO] Parameter: groupId, Value: com.zyiz
[INFO] Parameter: artifactId, Value: Student
[INFO] Parameter: packageName, Value: com.zyiz
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] project created from Old (1.x) Archetype in dir: D:\mvn\Student
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 09:20 min
[INFO] Finished at: 2017-04-12T03:05:53+08:00
[INFO] Final Memory: 14M/99M
[INFO] ------------------------------------------------------------------------

D:\mvn>

现在打开C：\MVN目录。您将看到一个名为student的java应用程序项目(在artifactId中指定)。更新POM.xml以包含Spring-AOP依赖关系。添加MainApp.java，Student.java和Logging.java这几个代码文件。

文件 - POM.xml 的内容如下 -

<project xmlns="http://maven.apache.org/POM/4.0.0" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
   http://maven.apache.org/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.zyiz</groupId>
   <artifactId>Student</artifactId>
   <packaging>jar</packaging>
   <version>1.0-SNAPSHOT</version>
   <name>Student</name>
   <url>http://maven.apache.org</url>
   <dependencies>
      <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>
         <version>3.8.1</version>
         <scope>test</scope>
      </dependency>
      <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-aop</artifactId>
         <version>4.1.0.RELEASE</version>
      </dependency>
      <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-context</artifactId>
         <version>4.1.4.RELEASE</version>
      </dependency>
      <dependency>
         <groupId>org.aspectj</groupId>
         <artifactId>aspectjweaver</artifactId>
         <version>1.6.8</version>
      </dependency>
   </dependencies>
</project>

文件 - Logging.java 的内容如下 -

package com.zyiz;

public class Logging {

   /** 
    * This is the method which I would like to execute
    * before a selected method execution.
    */
   public void beforeAdvice(){
      System.out.println("Going to setup student profile.");
   }

   /** 
    * This is the method which I would like to execute
    * after a selected method execution.
    */
   public void afterAdvice(){
      System.out.println("Student profile has been setup.");
   }

   /** 
    * This is the method which I would like to execute
    * when any method returns.
    */
   public void afterReturningAdvice(Object retVal){
      System.out.println("Returning:" + retVal.toString() );
   }

   /**
    * 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());   
   }

}

文件 - Student.java 的内容如下 -

package com.zyiz;

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();
   }
}

文件 - MainApp.java 的内容如下 -

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.getName();
      student.getAge();

      student.printThrowException();
   }
}

在src/main/resources文件夹下添加配置文件Beans.xml：

<?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:config>
      <aop:aspect id="log" ref="logging">
         <aop:pointcut id="selectAll" 
         expression="execution(* com.zyiz.*.*(..))"/>
         <aop:before pointcut-ref="selectAll" method="beforeAdvice"/>
         <aop:after pointcut-ref="selectAll" method="afterAdvice"/>
         <aop:after-returning pointcut-ref="selectAll" 
                              returning="retVal"
                              method="afterReturningAdvice"/>
         <aop:after-throwing pointcut-ref="selectAll" 
                             throwing="ex"
                             method="AfterThrowingAdvice"/>
      </aop:aspect>
   </aop:config>

   <!-- Definition for student bean -->
   <bean id="student" class="com.zyiz.Student">
      <property name="name"  value="Maxsu" />
      <property name="age"  value="21"/>      
   </bean>

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

</beans>

打开命令控制台，进入D:\MVN目录并执行下面的mvn命令。

D:\MVN>Student> mvn package

Maven将开始处理并下载所需的库。

Downloading: http://repo.maven.apache.org/maven2/commons-lang/commons-lang/2.1/commons-lang-2.1.jar
Downloading: http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/3.0/plexus-utils-3.0.jar
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/maven-archiver/2.5/maven-archiver-2.5.jar (22 KB at 25.9 KB/sec)
Downloaded: http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-io/2.0.2/plexus-io-2.0.2.jar (57 KB at 54.3 KB/sec)
Downloaded: http://repo.maven.apache.org/maven2/commons-lang/commons-lang/2.1/commons-lang-2.1.jar (203 KB at 188.7 KB/sec)
Downloaded: http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/3.0/plexus-utils-3.0.jar (221 KB at 145.8 KB/sec)
Downloaded: http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/2.1/plexus-archiver-2.1.jar (181 KB at 100.8 KB/sec)
[INFO] Building jar: D:\mvn\Student\target\Student-1.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 43.164 s
[INFO] Finished at: 2017-04-12T05:11:44+08:00
[INFO] Final Memory: 19M/158M
[INFO] ------------------------------------------------------------------------

D:\mvn\Student>

在Eclipse中导入项目

打开Eclipse IDE，导入项目目录。

选择文件>导入>选项。
选择Maven项目选项。点击下一步按钮。
选择项目位置，其中使用Maven创建Student项目。
单击完成按钮。

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。 如果您的应用程序没有问题，将打印以下消息：

四月 12, 2017 5:19:04 上午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@300ffa5d: startup date [Wed Apr 12 05:19:04 CST 2017]; root of context hierarchy
四月 12, 2017 5:19:04 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [Beans.xml]
Going to setup student profile.
Exception in thread "main" Name : Maxsu
Student profile has been setup.
Returning:Maxsu
Going to setup student profile.
Age : 21
Student profile has been setup.
Returning:21
Going to setup student profile.
Exception raised
Student profile has been setup.
There has been an exception: java.lang.IllegalArgumentException
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$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:52)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.aspectj.AspectJAfterAdvice.invoke(AspectJAfterAdvice.java:43)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:52)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:58)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653)
    at com.zyiz.Student$$EnhancerBySpringCGLIB$$92ccc3c2.printThrowException(<generated>)
    at com.zyiz.MainApp.main(MainApp.java:16)