AOP基于注解实现

最新推荐文章于 2025-05-25 22:25:05 发布

别念茶茶

最新推荐文章于 2025-05-25 22:25:05 发布

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分类专栏：业务逻辑层框架文章标签： aop

本文链接：https://blog.youkuaiyun.com/weixin_38912281/article/details/88977935

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本文介绍了如何使用AOP注解实现切面增强，包括@Aspect声明切面类，@Before、@After、@Around、@AfterThrowing声明各种增强，并展示了对应的XML配置、接口、实现类以及测试用例。

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切面类
@Component   //控制反转
@Aspect     //声明切面类
public class ForumAdvisor {
   //execution(* com.mitu.aspect.*.removeTopic(..))切点
   @Before("execution(* com.mitu.aspect.*.removeTopic(..))")   //声明前置增强
   public void before(JoinPoint jPoint) throws Throwable {
       System.out.println("这是前置增强");

       //获取目标对象包全名
       String classType=jPoint.getTarget().getClass().getName();
       Class<?> clazz=Class.forName(classType);
       String className = clazz.getName();
       System.out.println(className);

       //获取目标对象类名
       String classSimpleName = clazz.getSimpleName();
       System.out.println(classSimpleName);

       //获取目标对象方法名
       String methodName = jPoint.getSignature().getName();
       System.out.println(methodName);

       //获取目标对象参数值
       Object[] args = jPoint.getArgs();
       System.out.println("参数："+args[0]);
   }

   @After("execution(* com.mitu.aspect.*.*(..))")   //声明后置增强
   public void after() {
       System.out.println("这是后置增强");
   }

   @Around("execution(* com.mitu.aspect.*.*(..))")   //声明环绕增强
   public Object around(ProceedingJoinPoint point) throws Throwable{
       //计算方法耗时
       System.out.println("这是环绕增强（前置增强）");
       long start = System.currentTimeMillis();

       Object object = point.proceed();

       System.out.println("这是环绕增强（后置增强）");
       long end = System.currentTimeMillis();

       //获取目标对象包全名
       String classType=point.getTarget().getClass().getName();
       Class<?> clazz=Class.forName(classType);
       String className = clazz.getName();
       //获取目标对象方法名
       String methodName = point.getSignature().getName();

       System.out.println(className+":"+methodName+"耗时"+(end-start));
       return object;
   }

   @AfterThrowing(pointcut="execution(* com.mitu.aspect.*.*(..))",throwing="ex")   //声明抛出异常增强
   public void afterThrowing(Exception ex) {
       System.out.println("这是抛出异常增强");
   }
}

aop.xml配置：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:aop="http://www.springframework.org/schema/aop"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd">
   
   <aop:aspectj-autoproxy/>
   
   <context:component-scan base-package="com.mitu.annonationaop"/>
</beans>

接口类：
public interface IForumService {
public void removeTopic(int topicId);
public void removeForum(int forumId);
}

实现类：
@Component //控制反转
public class ForumServiceImp implements IForumService{

   @Override
   public void removeTopic(int topicId) {
       try {
           System.out.println("删除论坛帖子："+topicId);
           //Thread.currentThread()获取当前线程
           Thread.currentThread().sleep(600);
       } catch (InterruptedException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
//       throw new RuntimeException("抛出运行时异常");
   }

   @Override
   public void removeForum(int forumId) {
       try {
           System.out.println("删除论坛板块："+forumId);
           Thread.currentThread().sleep(2000);
       } catch (InterruptedException e) {
           e.printStackTrace();
       }
   }
}

测试类：
public class AnnonationAopTest {
   public static void main(String[] args) {
       ApplicationContext aContext = new ClassPathXmlApplicationContext("com/mitu/annonationaop/aop.xml");
       //注意强制类型转换的类型为：接口IForumService
       IForumService forumService = (IForumService)aContext.getBean("forumServiceImp");
       forumService.removeForum(200);
       forumService.removeTopic(150);
   }
}