定义通知类
定义切入点:依托一个不具有实际意义的方法，即无参数，无返回值，方法体无实体逻辑
绑定切入点与通知关系，并指定通知添加到原始连接点的具体执行位置
Spring管理通知类，并定义当前类为切片类
com.fan.aop.CommonFunc
@Component
@Aspect
public class CommonFunc {
@Pointcut("execution(void com.fan.dao.BookDao.update())")
private void pt() {
}
@Before("pt()")
public void method() {
System.out.println(System.currentTimeMillis());
}
}
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