前言

• springboot 2.0.0.RELEASE
• maven 3.5.0

自動掃描

默認掃描 @SpringBootApplication 類所在目錄及子目錄。

跳過掃描

@ComponentScan 搭配 excludeFilters

示例：

@ComponentScan(excludeFilters = @Filter(FilterType.ANNOTATION, classes = Controller.class))

參考：https://docs.spring.io/spring-boot/docs/2.0.0.RELEASE/api/index.html?org/springframework/boot/context/TypeExcludeFilter.html

FilterType

public enum FilterType {/*** Filter candidates marked with a given annotation.* @see org.springframework.core.type.filter.AnnotationTypeFilter*/ANNOTATION,/*** Filter candidates assignable to a given type.* @see org.springframework.core.type.filter.AssignableTypeFilter*/ASSIGNABLE_TYPE,/*** Filter candidates matching a given AspectJ type pattern expression.* @see org.springframework.core.type.filter.AspectJTypeFilter*/ASPECTJ,/*** Filter candidates matching a given regex pattern.* @see org.springframework.core.type.filter.RegexPatternTypeFilter*/REGEX,/** Filter candidates using a given custom* {@link org.springframework.core.type.filter.TypeFilter} implementation.*/CUSTOM}

FilterType.ANNOTATION 按注解類型排除

@SpringBootApplication @ComponentScan(excludeFilters = @Filter(FilterType.ANNOTATION, classes = Controller.class)) public class Application {public static void main(String[] args) throws IOException {SpringApplication.run(Application.class, args);}@Beanpublic CommandLineRunner commandLineRunner(ApplicationContext ctx) {return args -> {System.out.println("startup done.");};} }

FilterType.REGEX 正則表示達

@SpringBootApplication @ComponentScan(excludeFilters = @Filter(type = FilterType.REGEX, pattern = {"net.sayyy.db.*"})) public class Application {public static void main(String[] args) throws IOException {SpringApplication.run(Application.class, args);}@Beanpublic CommandLineRunner commandLineRunner(ApplicationContext ctx) {return args -> {System.out.println("startup done.");};} }

FilterType.CUSTOM 自定義規則

@SpringBootApplication @ComponentScan(excludeFilters = @Filter(type = FilterType.CUSTOM, classes = MyCustomerFilter.class)) public class Application {public static void main(String[] args) throws IOException {SpringApplication.run(Application.class, args);}@Beanpublic CommandLineRunner commandLineRunner(ApplicationContext ctx) {return args -> {System.out.println("startup done.");};} }

自定義過濾規則是需要實現 TypeFilter 接口
自定義掃描規則， 匹配類名中帶有 Service 的類

public class MyCustomerFilter implements TypeFilter {public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory) throws IOException {String className = metadataReader.getClassMetadata().getClassName();return className.contains("Service");} }

總結

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