@AspectJ 注解 - 爱码网

一、Java注解：

@AspectJ 注解

二、入门示例<编程式>：

public interface Waiter {

public void greetTo(String clientName);
public void serveTo(String clientName);
}

/**
* 目标类方法
* @author fmr
*/
public class NaiveWaiter implements Waiter{
   @Override
   public void greetTo(String clientName) {
       System.out.println("NaiveWaiter: greetTo..."+clientName+"...");
   }

   @Override
   public void serveTo(String clientName) {
       System.out.println("NaiveWaiter: serveTo..."+clientName+"...");
   }
}

/**
* 业务增强类
* @author fmr
*/
@Aspect //标识切面
public class PreGreetingAspect {
   @Before("execution(* greetTo(..))") //定义切点和增强类型
   public void beforeGreeting() { //增强的横切逻辑
       System.out.println("How are you");
   }
}

/**
* 测试类
* @author fmr
*/
public class AspectJProxyTest {
   public static void main(String[] args) {
       //1、创建代理工厂
       AspectJProxyFactory factory = new AspectJProxyFactory();
       //2、创建目标对象
       Waiter waiter = new NaiveWaiter();
       //3、设置目标对象
       factory.setTarget(waiter);
       //4、添加切面类
       factory.addAspect(PreGreetingAspect.class);
       //5、生成代理对象
       Waiter proxyWaiter = factory.getProxy();
       //6、运行
       proxyWaiter.greetTo("张三");
       proxyWaiter.serveTo("张三");
   }
}

xml配置：

@AspectJ 注解

三、增强类型：

@Before @AfterReturning @Around @AfterThrowing---> 抛出增强

@After --- > Final 增强：不管是抛出异常还是正常退出。

四、切点表达式：<常用>

@AspectJ 注解