Spring事务处理及其AOP框架的内幕(3)

以上就是配置文件,现在我们假设使用业务对象如下,这里是一个简单测试类:
//$ID:MainApp.java Created:2005-11-6 by Kerluse Benn
package com.osiris.springaop;
import java.util.Date;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;
import com.osiris.springaop.advices.intruduction.IAuditable;
public class MainApp {
/**
* @param args
* @author Kerluse Benn
*/
public static void main(String[] args) throws Exception{
// TODO Add your codes here
BeanFactory factory=new XmlBeanFactory(new FileSystemResource("bean.xml"));
BookService bookService=(BookService)factory.getBean("BookService");
IAuditable auditable=(IAuditable)bookService;
System.out.print(bookService.OrderBook("Kerluse Benn","Professional C#"));
auditable.setLastModifiedDate(new Date());
System.out.println(" 订购时间为"+auditable.getLastModifiedDate());
Thread.sleep(10000);
System.out.print(bookService.OrderBook("Kerluse Benn","Expert j2ee one-on-one"));
auditable.setLastModifiedDate(new Date());
System.out.println(" 订购时间为"+auditable.getLastModifiedDate());
}
}
输出结果:
订购Professional C#成功 订购时间为Mon Nov 07 11:35:20 CST 2005
订购Expert j2ee one-on-one成功 订购时间为Mon Nov 07 11:35:30 CST 2005
看见上面黑体字:
IAuditable auditable=(IAuditable)bookService;
由于bookService对象事实上已经实现了IAuditable接口,通过Spring AOP的introduction切入实现,所以在运行时(熟悉C++的vtable模型的可以在大脑里想一下)可以转换,我们就可以随意添加自己的接口方法了.