spring bean 根据包路径扫描对象加载过程

女爷i 2022-06-17 07:50 179阅读 0赞

*  起点

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd" default-lazy-init="true">
        <description>Spring公共配置 </description>
        
        <context:component-scan base-package="com">
        </context:component-scan>
    </beans>

这个位置  
context:component-scan指定扫描包路径

spring-context

在 /META-INF/spring.handlers中找到

http\://www.springframework.org/schema/context=org.springframework.context.config.ContextNamespaceHandler

public class ContextNamespaceHandler extends NamespaceHandlerSupport { 
    
        @Override
        public void init() {
            registerBeanDefinitionParser("property-placeholder", new PropertyPlaceholderBeanDefinitionParser());
            registerBeanDefinitionParser("property-override", new PropertyOverrideBeanDefinitionParser());
            registerBeanDefinitionParser("annotation-config", new AnnotationConfigBeanDefinitionParser());
            registerBeanDefinitionParser("component-scan", new ComponentScanBeanDefinitionParser());//定位到这
            registerBeanDefinitionParser("load-time-weaver", new LoadTimeWeaverBeanDefinitionParser());
            registerBeanDefinitionParser("spring-configured", new SpringConfiguredBeanDefinitionParser());
            registerBeanDefinitionParser("mbean-export", new MBeanExportBeanDefinitionParser());
            registerBeanDefinitionParser("mbean-server", new MBeanServerBeanDefinitionParser());
        }
    
    }

该博文还在不断完善中。。。