1.配置文件形式：
<context:component-scan base-package="com.atguigu" />
spring会扫描此包下的@Service @Repository @Component @Autoware @Resource 等注解
2.注解形式
在配置文件注解类（@Configuration）上声明@ComponentScans,里面包含多个@ComponentScan，
或是只声明@ComponentScan
package com.atguigu.config;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.FilterType;import org.springframework.context.annotation.ComponentScan.Filter;import org.springframework.context.annotation.ComponentScans;import com.atguigu.bean.Person;//配置类==配置文件@Configuration //告诉Spring这是一个配置类@ComponentScans( value = { @ComponentScan(value="com.atguigu",includeFilters = {/* @Filter(type=FilterType.ANNOTATION,classes={Controller.class}), @Filter(type=FilterType.ASSIGNABLE_TYPE,classes={BookService.class}),*/ @Filter(type=FilterType.CUSTOM,classes={MyTypeFilter.class}) },useDefaultFilters = false) } )//@ComponentScan value:指定要扫描的包//excludeFilters = Filter[] ：指定扫描的时候按照什么规则排除那些组件//includeFilters = Filter[] ：指定扫描的时候只需要包含哪些组件//FilterType.ANNOTATION：按照注解//FilterType.ASSIGNABLE_TYPE：按照给定的类型；//FilterType.ASPECTJ：使用ASPECTJ表达式//FilterType.REGEX：使用正则指定//FilterType.CUSTOM：使用自定义规则public class MainConfig { //给容器中注册一个Bean;类型为返回值的类型，id默认是用方法名作为id @Bean("person") public Person person01(){ return new Person("lisi", 20); }} 3.自定义过滤器（用于注解）
package com.atguigu;import java.io.IOException;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;public class MyTypeFilter implements TypeFilter { public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory) throws IOException { //获取当前类的注解信息 AnnotationMetadata annotationMetadata = metadataReader.getAnnotationMetadata(); //获取当前类的类信息 ClassMetadata classMetadata = metadataReader.getClassMetadata(); System.out.println("------------->" + classMetadata.getClassName()); //资源信息 Resource resource = metadataReader.getResource(); if(classMetadata.getClassName().contains("Controller")){ return true; } return false; }}