Spring Aop：注解开发

AOP:注解开发

切面 = 切点+通知

引入依赖

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.0.2.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.aspectj</groupId>     <artifactId>aspectjweaver</artifactId>
    <version>1.8.7</version>
</dependency>

通知类

//表示该类是切面类
@Aspect、
@Component
public class Notice {
//切点配置
    @Pointcut("execution(* cn.itcast..*.*(..))")
    public void pointcut(){};

    @Before("pointcut()")
    public void before(){//切点执行前执行
        System.out.println("前置通知");
    }
   @AfterReturning("pointcut()")
    public void afterReturn(){//切点返回结果之前执行，它和异常通知只能执行一个
        System.out.println("后置通知");
    }
    @AfterThrowing(throwing = "e",pointcut = "pointcut()")
    public void exception(Exception e){//出现异常，执行
        System.out.println("异常通知"+e);
    }
    @Pointcut("pointcut()")
    public void after(){//切点执行后执行，一定会执行
        System.out.println("最终通知");
    }
   @Around(value = "pointcut()")
    public void around(ProceedingJoinPoint joinPoint){//环绕通知
        before();//以上的加和
        try {
            joinPoint.proceed();
            afterReturn();
        } catch (Throwable throwable) {
            throwable.printStackTrace();

        }
        after();
    }
}
~

配置文件

//开启注解aop
<aop:aspectj-autoproxy/>~