Spring针对AOP详细讲解

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
 </dependency>

@Component
@Aspect //定义切面
public class UserAspect {
    @Pointcut("execution(* com.example.demo.controller.UserController.*(..))")
    public void pointcut(){}
}

@Component
@Aspect //定义切面
public class UserAspect {
    @Pointcut("execution(* com.example.demo.controller.UserController.*(..))")
    public void pointcut(){}
    // 前置通知（要带一个括号）
    @Before("pointcut()")
    public void doBefore(){
        //业务代码
        System.out.println();
        System.out.println("执行了前置通知");
        System.out.println();
    }
}
 @Around("pointcut()")
    public Object doAround(ProceedingJoinPoint joinPoint){
        Object result = null;
        //执行前置业务代码
        System.out.println("执行环绕通知的前置方法");
        try {
            //执行（拦截的）业务方法
            result = joinPoint.proceed();
        } catch (Throwable throwable) {
            throwable.printStackTrace();
        }
        //执行后置业务代码
        System.out.println("执行环绕通知的后置方法");
        return result;
    }