Spring AOP 切面没有执行

Question

我想试试aop怎么用，但是写好之后没有调用切面，而IDEA却找到了我的切面和切入点。。配置类：@Configuration@EnableAspectJAutoProxy@ComponentScanpublic class CarConfig {    public static void main(String[] args) {        AnnotationConfigApplicationContext context =                        new AnnotationConfigApplicationContext(CarConfig.class);        System.out.println("-------------Spring context loaded-------------");        Ferrari ferrari = context.getBean(Ferrari.class);        Driver driver = new Driver(new License("s3j3"));        int time = driver.drive(ferrari, 1000);        System.out.println("spent " + time + " hours");        System.out.println("-------------Spring context is going to close-----------");        context.close();    }}Driver:public class Driver {    private License license;    public Driver(License license) {        this.license = license;    }    public int drive(Car car, int distance) {        if (license == null) return -1;        if (distance <= 0) return 0;        if (car == null || car.getSpeed() <= 0) return -1;        return distance / car.getSpeed() + 1;    }}Aspect:@Aspect@Componentpublic class Monitor {    @Pointcut(value = "execution(int cn.gaoyuexiang.spring.demo.test.aop.driver.Driver" +                    ".drive(cn.gaoyuexiang.spring.demo.test.aop.car.Car, int)) " +                    "&& args(car, distance)")    public void drive(Car car, int distance) {}    @Before("drive(car, distance)")    public void aboard(Car car, int distance) {        String carName = car.getClass().getName();        System.out.println("the driver will drive a " + carName +                        " to run " + distance + " kilometers");    }}目录结构：.├── aop│   └── Monitor.java├── car│   ├── Car.java│   └── Ferrari.java├── CarConfig.java└── driver    ├── Driver.java    └── license        └── License.java从Spring的输出发现Monitor已经被扫描到了，但是切面却没有执行，不知道是为什么

Answer 1

你的Driver类需要声明为一个Spring Bean。而且Driver类是你自己new的，所以Spring没法知道它是什么时候被实例化的。