基本使用
在配置类上写@CompentScan注解来进行包扫描
@Configuration @ComponentScan(basePackages = {"com.artisan"}) public class MainConfig { }
excludeFilters
@Configuration @ComponentScan(basePackages = {"com.artisan"},excludeFilters = { @ComponentScan.Filter(type = FilterType.ANNOTATION,value = {Controller.class}), @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE,value = {ArtisanService.class}) }) public class MainConfig { }
这里会 排除标注了@Controller注解 和 特定的ArtisanService ,不会被加载到IOC容器中。
includeFilters
若使用包含的用法， 需要把useDefaultFilters属性设置为false（true表示扫描全部的）
@Configuration @ComponentScan(basePackages = {"com.artisan"},includeFilters = { @ComponentScan.Filter(type = FilterType.ANNOTATION,value = {Controller.class, Service.class}) },useDefaultFilters = false) public class MainConfig { }
@ComponentScan.Filter
4种类型
- 注解形式的FilterType.ANNOTATION
比如@Controller @Service @Repository @Compent - 指定类型的 FilterType.ASSIGNABLE_TYPE
@ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE,value = {ArtisanService.class})
- aspectj类型的 FilterType.ASPECTJ(不常用)
- 正则表达式的 FilterType.REGEX(不常用)
- 自定义的 FilterType.CUSTOM
自定义FilterType
import org.springframework.core.io.Resource; import org.springframework.core.type.AnnotationMetadata; import org.springframework.core.type.ClassMetadata; import org.springframework.core.type.classreading.MetadataReader; import org.springframework.core.type.classreading.MetadataReaderFactory; import org.springframework.core.type.filter.TypeFilter; import java.io.IOException; public class ArtisanFilterType implements TypeFilter { @Override public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory) throws IOException { //获取当前类的注解源信息 AnnotationMetadata annotationMetadata = metadataReader.getAnnotationMetadata(); //获取当前类的class的源信息 ClassMetadata classMetadata = metadataReader.getClassMetadata(); //获取当前类的资源信息 Resource resource = metadataReader.getResource(); System.out.println("类的路径:"+classMetadata.getClassName()); if(classMetadata.getClassName().contains("dao")) { return true; } return false; } }
引用自定义类型的Filter
@ComponentScan(basePackages = {"com.tuling.testcompentscan"},excludeFilters = { @ComponentScan.Filter(type = FilterType.CUSTOM,value = ArtisanFilterType.class) },includeFilters = { @ComponentScan.Filter(type = FilterType.ANNOTATION,value = Repository.class) })
测试的话，打印下beanDefinition 即可
public class MainClass { public static void main(String[] args) { AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(MainConfig.class); String[] beanDefinationNames = ctx.getBeanDefinitionNames(); for (String name:beanDefinationNames) { System.out.println("bean的定义信息:"+name); } } }
