哪个高手帮初学者看哈这个问题嘛~小弟已经困惑几天了~~~~~

于 2008-02-22 21:11:10 发布 · 214 阅读

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本文通过一个具体的示例展示了如何使用Spring AOP结合AspectJ实现方法调用前的增强处理。具体步骤包括配置Spring上下文，定义目标类和服务类，以及编写AspectJ切面代码。运行结果验证了切面功能的有效性。

主函数:

ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");
Waiter w=(Waiter)ctx.getBean("waiter");
w.greetto("yinfan");

XML:

<aop:aspectj-autoproxy/>
<bean id="waiter" class="aspect.implewaiter"></bean>
<bean class="aspect.pregreetingaspect"/>

目标类:

package aspect;

public class implewaiter implements Waiter {

public void greetto(String name) {
// TODO Auto-generated method stub
System.out.println("greet to "+name);

}

public void serveto(String name) {
// TODO Auto-generated method stub
System.out.println("server to "+name);

}

}

切面代码:

package aspect;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

@Aspect
public class pregreetingaspect {
@Before("execution(* greetto(..))")
public void before()
{
System.out.println("how are you ");
}
}

结果:

how are you
how are you
greet to yinfan

你看,有两个how are you 呢?