```
@Retention(RUNTIME)
@Target(TYPE)
@Documented
@Repeatable(ComponentScans.class)
public @interface ComponentScan
```
Configures component scanning directives for use with @Configuration classes. Provides support parallel with Spring XML's <context:component-scan> element.
Either basePackageClasses() or basePackages() (or its alias value()) may be specified to define specific packages to scan. If specific packages are not defined, scanning will occur from the package of the class that declares this annotation.
Note that the <context:component-scan> element has an annotation-config attribute; however, this annotation does not. This is because in almost all cases when using @ComponentScan, default annotation config processing (e.g. processing @Autowired and friends) is assumed. Furthermore, when using AnnotationConfigApplicationContext, annotation config processors are always registered, meaning that any attempt to disable them at the @ComponentScan level would be ignored.
See @Configuration's Javadoc for usage examples.
从以下版本开始:
3.1
作者:
Chris Beams, Juergen Hoeller, Sam Brannen
另请参阅:
Configuration

可选元素概要

可选元素
修饰符和类型	可选元素	说明
`Class<?>[]`	`basePackageClasses`	Type-safe alternative to `basePackages()` for specifying the packages to scan for annotated components.
`String[]`	`basePackages`	Base packages to scan for annotated components.
`ComponentScan.Filter[]`	`excludeFilters`	Specifies which types are not eligible for component scanning.
`ComponentScan.Filter[]`	`includeFilters`	Specifies which types are eligible for component scanning.
`boolean`	`lazyInit`	Specify whether scanned beans should be registered for lazy initialization.
`Class<? extends BeanNameGenerator>`	`nameGenerator`	The `BeanNameGenerator` class to be used for naming detected components within the Spring container.
`String`	`resourcePattern`	Controls the class files eligible for component detection.
`ScopedProxyMode`	`scopedProxy`	Indicates whether proxies should be generated for detected components, which may be necessary when using scopes in a proxy-style fashion.
`Class<? extends ScopeMetadataResolver>`	`scopeResolver`	The `ScopeMetadataResolver` to be used for resolving the scope of detected components.
`boolean`	`useDefaultFilters`	Indicates whether automatic detection of classes annotated with `@Component@Repository`, `@Service`, or `@Controller` should be enabled.
`String[]`	`value`	Alias for `basePackages()`.

- 元素详细资料
  - value
```
@AliasFor("basePackages")
String[] value
```
    Alias for basePackages().
    Allows for more concise annotation declarations if no other attributes are needed — for example, @ComponentScan("org.my.pkg") instead of @ComponentScan(basePackages = "org.my.pkg").
    默认值:
    {}
- - basePackages
```
@AliasFor("value")
String[] basePackages
```
    Base packages to scan for annotated components.
    value() is an alias for (and mutually exclusive with) this attribute.
    Use basePackageClasses() for a type-safe alternative to String-based package names.
    默认值:
    {}
- - basePackageClasses
```
Class<?>[] basePackageClasses
```
    Type-safe alternative to basePackages() for specifying the packages to scan for annotated components. The package of each class specified will be scanned.
    Consider creating a special no-op marker class or interface in each package that serves no purpose other than being referenced by this attribute.
    默认值:
    {}
- - nameGenerator
```
Class<? extends BeanNameGenerator> nameGenerator
```
    The BeanNameGenerator class to be used for naming detected components within the Spring container.
    The default value of the BeanNameGenerator interface itself indicates that the scanner used to process this @ComponentScan annotation should use its inherited bean name generator, e.g. the default AnnotationBeanNameGenerator or any custom instance supplied to the application context at bootstrap time.
    另请参阅:
    AnnotationConfigApplicationContext.setBeanNameGenerator(BeanNameGenerator)
    默认值:
    org.springframework.beans.factory.support.BeanNameGenerator.class
- - scopeResolver
```
Class<? extends ScopeMetadataResolver> scopeResolver
```
    The ScopeMetadataResolver to be used for resolving the scope of detected components.
    默认值:
    org.springframework.context.annotation.AnnotationScopeMetadataResolver.class
- - scopedProxy
```
ScopedProxyMode scopedProxy
```
    Indicates whether proxies should be generated for detected components, which may be necessary when using scopes in a proxy-style fashion.
    The default is defer to the default behavior of the component scanner used to execute the actual scan.
    Note that setting this attribute overrides any value set for scopeResolver().
    另请参阅:
    ClassPathBeanDefinitionScanner.setScopedProxyMode(ScopedProxyMode)
    默认值:
    org.springframework.context.annotation.ScopedProxyMode.DEFAULT
- - resourcePattern
```
String resourcePattern
```
    Controls the class files eligible for component detection.
    Consider use of includeFilters() and excludeFilters() for a more flexible approach.
    默认值:
    "**/*.class"
- - useDefaultFilters
```
boolean useDefaultFilters
```
    Indicates whether automatic detection of classes annotated with @Component@Repository, @Service, or @Controller should be enabled.
    默认值:
    true
- - includeFilters
```
ComponentScan.Filter[] includeFilters
```
    Specifies which types are eligible for component scanning.
    Further narrows the set of candidate components from everything in basePackages() to everything in the base packages that matches the given filter or filters.
    Note that these filters will be applied in addition to the default filters, if specified. Any type under the specified base packages which matches a given filter will be included, even if it does not match the default filters (i.e. is not annotated with @Component).
    另请参阅:
    resourcePattern(), useDefaultFilters()
    默认值:
    {}
- - excludeFilters
```
ComponentScan.Filter[] excludeFilters
```
    Specifies which types are not eligible for component scanning.
    另请参阅:
    resourcePattern()
    默认值:
    {}
- - lazyInit
```
boolean lazyInit
```
    Specify whether scanned beans should be registered for lazy initialization.
    Default is false; switch this to true when desired.
    从以下版本开始:
    4.1
    默认值:
    false

注释类型 ComponentScan

可选元素概要

元素详细资料

value

basePackages

basePackageClasses

nameGenerator

scopeResolver

scopedProxy

resourcePattern

useDefaultFilters

includeFilters

excludeFilters

lazyInit