spring AOP切面实现

第一步：先准备几个javaBean对象

@Controller
public class UserController {
    public void test(){
        System.out.println("UserController.test");
    }
}

@Repository
public class UserDao {
    public void test(){
        System.out.println("UserDao.test");
    }
}

@Service
public class UserService {
    public void test(){
        System.out.println("UserService.test");
    }
}

第二步：定义切面

@Component
@Aspect
public class LogCut {

    
    @Pointcut("execution(* com.zks.service.*.*(..))")
    public void cut(){

    }

    
    @Before(value = "cut()")//通知指向前面的切入点
    public void before(){
        System.out.println("前置通知");
    }

    
    @AfterReturning(value = "cut()")
    public void afterReturn(){
        System.out.println("返回通知");
    }

    
    @After(value = "cut()")
    public void after(){
        System.out.println("最终通知");
    }

    
    @AfterThrowing(value = "cut()",throwing = "e")
    public void afterThrow( Exception e ){
        System.out.println("异常通知。。。异常原因："+e.getMessage());
    }

    
    @Around(value = "cut()")
    public Object around(ProceedingJoinPoint pjp){
        System.out.println("环绕通知-前置通知");
        Object object=null;
        try{
             object=pjp.proceed();//要有环绕通知，就必须要执行proceed()这个方法
//            System.out.println(pjp.getTarget());
            System.out.println("环绕通知-返回通知");
        }catch (Throwable throwable){
            throwable.printStackTrace();
            System.out.println("环绕通知-异常通知");
        }
        System.out.println("环绕通知-最终通知");
        return object;
    }


}

第三步：测试

public class aoptest {
    public static void main(String[] args) {
        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("spring.xml");
        UserService userService= (UserService) applicationContext.getBean("userService");
        userService.test();
    }
}

需要自己写配置文件了

定义的切面如下：没有注解了

@Component
public class LogCut2 {

    public void cut(){

    }

    

    public void before(){
        System.out.println("前置通知");
    }

    

    public void afterReturn(){
        System.out.println("返回通知");
    }

    

    public void after(){
        System.out.println("最终通知");
    }

    

    public void afterThrow( Exception e ){
        System.out.println("异常通知。。。异常原因："+e.getMessage());
    }

    

    public Object around(ProceedingJoinPoint pjp){
        System.out.println("环绕通知-前置通知");
        Object object=null;
        try{
            object=pjp.proceed();//要有环绕通知，就必须要执行proceed()这个方法
//            System.out.println(pjp.getTarget());
            System.out.println("环绕通知-返回通知");
        }catch (Throwable throwable){
            throwable.printStackTrace();
            System.out.println("环绕通知-异常通知");
        }
        System.out.println("环绕通知-最终通知");
        return object;
    }

}