Spring MVC+AOP实现Demo

本文的AOP例子,包括前置通知，后置通知,环绕通知,和目标对象。写这个例子的主要目标只是想让想学AOP的能更快地入门，了解一下如何去配置AOP里面的一些信息。

目标对象的接口:IStudent.java
package com.log4jAop;
 
public   interface  IStudent  {   
    public   void  addStudent(String name);
} 
 

目标类:StudentImpl.java

package com.log4jAop;
 
public   class  StudentImpl  implements  IStudent {
     public   void  addStudent(String name) {
           System.out.println( " 欢迎  " + name + "  你加入Spring家庭! " );
         } 
}

前置通知:BeforeAdvice.java

package com.log4jAop;
 
import java.lang.reflect.Method;
 
import  org.springframework.aop.MethodBeforeAdvice;
public   class  BeforeAdvice  implements  MethodBeforeAdvice {
  public   void  before(Method method,Object[] args, Object target)
           throws  Throwable {      
          System.out.println( " 这是BeforeAdvice类的before方法. " );         
      } 
 } 

后置通知:AfterAdvice.java

package com.log4jAop;
 
import java.lang.reflect.Method;
import org.springframework.aop.AfterReturningAdvice;
public class AfterAdvice implements AfterReturningAdvice{
    public void afterReturning(Object returnValue ,Method method,
                   Object[] args,Object target) throws Throwable{
        System.out.println("这是AfterAdvice类的afterReturning方法.");
    }
}

环绕通知:CompareInterceptor.java

package com.log4jAop;
 
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
public class CompareInterceptor implements MethodInterceptor{
 
     public Object invoke(MethodInvocation invocation) throws Throwable{
         Object result = null;
        String stu_name = invocation.getArguments()[0].toString();
        if ( stu_name.equals("dragon")){
              result= invocation.proceed();             
         } else{
             System.out.println("此学生是"+stu_name+"而不是dragon,不批准其加入.");
         }        
          return result;
      }
}

配置文件applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="beforeAdvice" class="com.log4jAop.BeforeAdvice"></bean>
    <bean id="afterAdvice" class="com.log4jAop.AfterAdvice"></bean>
    <bean id="compareInterceptor" class="com.log4jAop.CompareInterceptor"></bean>
    <bean id="studenttarget" class="com.log4jAop.StudentImpl"></bean>
    <bean id="student"
        class="org.springframework.aop.framework.ProxyFactoryBean">
        <property name="proxyInterfaces">
            <value>com.log4jAop.IStudent</value>
        </property>
        <property name="interceptorNames">
            <list>
                <value>beforeAdvice</value>
                <value>afterAdvice</value>
                <value>compareInterceptor</value>
            </list>
        </property>
        <property name="target">
            <ref bean="studenttarget" />
        </property>
    </bean>
</beans>

现在开始写测试类,Test.java

package com.log4jAop;
 
 
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
 
public class Test {
 
   /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
      ApplicationContext ctx = 
          new FileSystemXmlApplicationContext("src/main/java/com/applicationContext.xml");
      
      IStudent person = (IStudent)ctx.getBean("student");
      person.addStudent("dragon");
      
    }
 
}

最终的目录结构如图：

pom.xml记得导入相应的库：

<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
 
  <groupId>com.log4j</groupId>
  <artifactId>com.log4j</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>
 
  <name>com.log4j</name>
  <url>http://maven.apache.org</url>
 
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
 
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.3.17.RELEASE</version>
    </dependency>
  </dependencies>
</project>

内容参考了：http://www.blogjava.net/javadragon/archive/2006/12/03/85115.html，亲测好用