第一个Spring AOP实例-优快云博客

本文详细介绍了Java AOP（面向切面编程）的概念，并通过具体代码实例展示了如何使用Spring AOP进行代理对象的创建及目标方法的增强。

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1.接口

 
package AOP2;
public interface Waiter {
    void greetTo(String clientName);
    void serveTo(String clientName);
}

2.target

package AOP2;
/**
 *
 * @author Administrator
 */
public class NaiveWaiter implements Waiter{
    @Override
    public void greetTo(String clientName) {
        System.out.println("NaiveWaiter:greet to "+clientName+"...");
    }
    @Override
    public void serveTo(String clientName) {
       System.out.println("NaiveWaiter:serving "+clientName+"...");
    }
}

3.切面

package AOP2;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
@Aspect
public class PreGreetingAspect {
    @Before("execution(* greetTo(..))") 
    public void beforeGreeting(){
    System.out.println("How are you"); 
    }
}

4.实现

package AOP2;
import org.springframework.aop.aspectj.annotation.AspectJProxyFactory;
/**
 *
 * @author Administrator
 */
public class AspectJProxyTest {
    public AspectJProxyTest() {
        Waiter target = new NaiveWaiter();
        //代理工厂
        AspectJProxyFactory factory = new AspectJProxyFactory();
        factory.setTarget(target);//设置目标对象
        factory.addAspect(PreGreetingAspect.class);//添加切面类，此类必须是带@AspectJ标注的类
        Waiter proxy = factory.getProxy();//生成织入切面的代理对象
        proxy.greetTo("John");//通过代理对象来调用目标对象
        proxy.serveTo("John");//完成AOP
    }
}