@ComponentScan：扫描

@ComponentScan告诉Spring哪个packages的用注解标识的类会被spring自动扫描并且装入bean容器

如：扫描com.liuy.controller

@ComponentScan(basePackages = { "com.liuy.controller" })


excludeFilters：指定不适合组件扫描的类型

如：不扫描含有@ExcludeFromComponentScan注解的类或接口

@ComponentScan(excludeFilters = { @ComponentScan.Filter(type = FilterType.ANNOTATION, value = ExcludeFromComponentScan.class) })