Spring源码学习笔记1

1.Spring中最核心的两个类

1)DefaultListableBeanFactory

　　XmlBeanFactory继承自DefaultListableBeanFactory，DefaultListableBeanFactory是整个bean加载的核心部分，是Spring加载及注册bean的默认实现

2)XmlBeanDefinitionReader

2.示例代码

BeanFactory bf=new XmlBeanFactory(new ClassPathResource("beanFactoryTest.xml"));

XmlBeanFactory.classpublic class XmlBeanFactory extends DefaultListableBeanFactory {
    private final XmlBeanDefinitionReader reader;

    public XmlBeanFactory(Resource resource) throws BeansException {
        this(resource, (BeanFactory)null);
    }

    public XmlBeanFactory(Resource resource, BeanFactory parentBeanFactory) throws BeansException {
        super(parentBeanFactory);
        this.reader = new XmlBeanDefinitionReader(this);
        this.reader.loadBeanDefinitions(resource);
    }
}

public int loadBeanDefinitions(Resource resource) throws BeanDefinitionStoreException {    return this.loadBeanDefinitions(new EncodedResource(resource));}

public int loadBeanDefinitions(EncodedResource encodedResource){....　　　　InputSource inputSource = new InputSource(inputStream);//通过SAX方式解析XML文件....　　this.doLoadBeanDefinitions(inputSource, encodedResource.getResource());

}

3.配置文件的封装

Resource implements InputStreamResource

4.AbstractAutowireCapableBeanFactory.ignoreDependencyInterface()

忽略给定接口的自动装配功能

5.加载Bean

protected int doLoadBeanDefinitions(InputSource inputSource, Resource resource) throws BeanDefinitionStoreException {
        try {
            int validationMode = this.getValidationModeForResource(resource);//获取xml文件的验证模式
            Document doc = this.documentLoader.loadDocument(inputSource, this.getEntityResolver(), this.errorHandler, validationMode, this.isNamespaceAware());//加载XML文件
            return this.registerBeanDefinitions(doc, resource);//返回注册bean的信息
        } catch (BeanDefinitionStoreException var5) {
            throw var5;
        } catch (SAXParseException var6) {
            throw new XmlBeanDefinitionStoreException(resource.getDescription(), "Line " + var6.getLineNumber() + " in XML document from " + resource + " is invalid", var6);
        } catch (SAXException var7) {
            throw new XmlBeanDefinitionStoreException(resource.getDescription(), "XML document from " + resource + " is invalid", var7);
        } catch (ParserConfigurationException var8) {
            throw new BeanDefinitionStoreException(resource.getDescription(), "Parser configuration exception parsing XML from " + resource, var8);
        } catch (IOException var9) {
            throw new BeanDefinitionStoreException(resource.getDescription(), "IOException parsing XML document from " + resource, var9);
        } catch (Throwable var10) {
            throw new BeanDefinitionStoreException(resource.getDescription(), "Unexpected exception parsing XML document from " + resource, var10);
        }
    }

1)获取xml文件的验证模式

2)加载XML文件

3)返回注册bean的信息

原文地址：https://www.cnblogs.com/lvjygogo/p/8974506.html