源代码

1. 定义一个PaymentService，PaymentServiceImpl实现类

@Service
@AllArgsConstructor
@Slf4j
public class PaymentServiceImpl extends ServiceImpl<PaymentMapper, Payment>
    implements PaymentService {
	@Override
    public void toPayment(Payment payment) {
        this.save(payment);
    }
}

2. 定义AOP，在save()方法调用之前对实体类进行预处理（将实体类中中某些属性进行初始化）

@Aspect
@Component
public class PaymentHandlerAspect {

    @Pointcut("execution(* com.jerry.payment.service.PaymentService.save(..))")
    public void beforeSave() {

    }

    @Before("beforeSave() && args(payment)")
    public void beforeSave(JoinPoint joinPoint, Payment payment) {
        payment.setCreateUser(userInfo.getId());
        payment.setUpdateUser(userInfo.getId());
        payment.setCreateTime(new Date());
        payment.setUpdateTime(new Date());
        payment.setIsDeleted(0);
    }
}

结果没有运行相关代码，则AOP失效

原因分析

在AOP所有的增强逻辑之后，都会被代理对象作为实例调用真实的方法

1. this指针指的是原始对象，而不是代理对象
2. 只有代理对象才拥有增强的逻辑

解决

1. 通过AopContext来获取代理对象，在启动类中添加注解@EnableAspectJAutoProxy(exposeProxy = true)
2. fun()方法改成：

@Service
@AllArgsConstructor
@Slf4j
public class PaymentServiceImpl extends ServiceImpl<PaymentMapper, Payment>
    implements PaymentService {
	@Override
    public void toPayment(Payment payment) {
        this.save();
        PaymentService paymentService = (PaymentService) AopContext.currentProxy();
        paymentService.save(payment);
    }
}