@ComponentScan 的作用就是根据定义的扫描路径,把符合扫描规则的类装配到spring容器中,注解定义如下。
//
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//
package org.springframework.context.annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.springframework.beans.factory.support.BeanNameGenerator;
import org.springframework.core.annotation.AliasFor;
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
@Documented
@Repeatable(ComponentScans.class)
public @interface ComponentScan {
@AliasFor("basePackages")
String[] value() default {};
@AliasFor("value")
String[] basePackages() default {};
Class<?>[] basePackageClasses() default {};
Class<? extends BeanNameGenerator> nameGenerator() default BeanNameGenerator.class;
Class<? extends ScopeMetadataResolver> scopeResolver() default AnnotationScopeMetadataResolver.class;
ScopedProxyMode scopedProxy() default ScopedProxyMode.DEFAULT;
String resourcePattern() default "**/*.class";
boolean useDefaultFilters() default true;
ComponentScan.Filter[] includeFilters() default {};
ComponentScan.Filter[] excludeFilters() default {};
boolean lazyInit() default false;
@Retention(RetentionPolicy.RUNTIME)
@Target({})
public @interface Filter {
FilterType type() default FilterType.ANNOTATION;
@AliasFor("classes")
Class<?>[] value() default {};
@AliasFor("value")
Class<?>[] classes() default {};
String[] pattern() default {};
}
}
basePackages与value
: 用于指定包的路径,进行扫描
basePackageClasses
: 用于指定某个类的包的路径进行扫描
nameGenerator
: bean的名称的生成器
useDefaultFilters
: 是否开启对@Component,@Repository,@Service,@Controller的类进行检测
includeFilters
: 包含的过滤条件
FilterType.ANNOTATION:按照注解过滤
FilterType.ASSIGNABLE_TYPE:按照给定的类型
FilterType.ASPECTJ:使用ASPECTJ表达式
FilterType.REGEX:正则
FilterType.CUSTOM:自定义规则
excludeFilters
: 排除的过滤条件,用法和includeFilters一样
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