IOC 容器默认扫描 @Controller,@Service,@Repository,@Component 注解的组件
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Documented
@Repeatable(ComponentScans.class)
public @interface ComponentScan {
/** 是否使用默认规则 */
boolean useDefaultFilters() default true;
/** 包含扫描的组件 */
Filter[] includeFilters() default {};
/** 不扫描的组件 */
Filter[] excludeFilters() default {};
}
@Retention(RetentionPolicy.RUNTIME)
@Target({})
@interface Filter {
/** 过滤规则,按什么类型过滤 */
FilterType type() default FilterType.ANNOTATION;
/** 需要过滤的组件 */
@AliasFor("classes")
Class<?>[] value() default {};
}
@Configuration
@ComponentScan(value = "com.john", excludeFilters = { @Filter(type = FilterType.ANNOTATION, classes = { Controller.class }) })
public class BeanConfig {
// 说明:排除带 @Controller 注解的组件,不扫描
}
@Configuration
@ComponentScan(value = "com.john", includeFilters = { @Filter(type = FilterType.ANNOTATION, classes = { Controller.class }) }, useDefaultFilters = false)
public class BeanConfig {
// 说明:只扫描com.john 包下面的 带@Controller 注解的组件,使用 includeFilters,需要禁用默认规则,即设置 useDefaultFilters = false
}