SpringBoot的@Import和@ImportResource

1. @Import

• • 源码　　

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Import {

    /**
     * {@link Configuration @Configuration}, {@link ImportSelector},
     * {@link ImportBeanDefinitionRegistrar}, or regular component classes to import.
     */
    Class<?>[] value();

}

• • 使用说明　　

1. 1. 导入@Configuration注解的配置类（4.2版本之前只可以导入配置类，4.2版本之后也可以导入普通类）
   2. 导入ImportSelector的实现类
   3. 导入ImportBeanDefinitionRegistrar的实现类

1. @ImportResource

• • 源码

    @Retention(RetentionPolicy.RUNTIME)
    @Target(ElementType.TYPE)
    @Documented
    public @interface ImportResource {
    
        /**
         * Alias for {@link #locations}.
         * @see #locations
         * @see #reader
         */
        @AliasFor("locations")
        String[] value() default {};
    
        /**
         * Resource locations from which to import.
         * <p>Supports resource-loading prefixes such as {@code classpath:},
         * {@code file:}, etc.
         * <p>Consult the Javadoc for {@link #reader} for details on how resources
         * will be processed.
         * @since 4.2
         * @see #value
         * @see #reader
         */
        @AliasFor("value")
        String[] locations() default {};
    
        /**
         * {@link BeanDefinitionReader} implementation to use when processing
         * resources specified via the {@link #value} attribute.
         * <p>By default, the reader will be adapted to the resource path specified:
         * {@code ".groovy"} files will be processed with a
         * {@link org.springframework.beans.factory.groovy.GroovyBeanDefinitionReader GroovyBeanDefinitionReader};
         * whereas, all other resources will be processed with an
         * {@link org.springframework.beans.factory.xml.XmlBeanDefinitionReader XmlBeanDefinitionReader}.
         * @see #value
         */
        Class<? extends BeanDefinitionReader> reader() default BeanDefinitionReader.class;
    
    }

  • 使用说明

　　　　　　　@ImportResource等同于xml配置：<import resource="配置文件.xml" />