spring启动过程之源码跟踪（续beanfactory）--spring Debug

1.初始化过程

1         Resource res = new ClassPathResource("/applicationContext.xml"); 2         XmlBeanFactory factory = new XmlBeanFactory(res); 

2.入门

 1     /** 2      * Create a new XmlBeanFactory with the given input stream, 3      * which must be parsable using DOM. 4      * @param resource XML resource to load bean definitions from 5      * @param parentBeanFactory parent bean factory 6      * @throws BeansException in case of loading or parsing errors 7      */ 8     public XmlBeanFactory(Resource resource, BeanFactory parentBeanFactory) throws BeansException { 9         super(parentBeanFactory);10         this.reader.loadBeanDefinitions(resource);11     }

3.读取配置文件XmlBeanDefinitionReader.java

 1     public int loadBeanDefinitions(EncodedResource encodedResource) throws BeanDefinitionStoreException { 2         Assert.notNull(encodedResource, "EncodedResource must not be null"); 3         if (logger.isInfoEnabled()) { 4             logger.info("Loading XML bean definitions from " + encodedResource.getResource()); 5         } 6  7         Set currentResources = (Set) this.resourcesCurrentlyBeingLoaded.get(); 8         if (currentResources == null) { 9             currentResources = new HashSet(4);10             this.resourcesCurrentlyBeingLoaded.set(currentResources);11         }12         if (!currentResources.add(encodedResource)) {13             throw new BeanDefinitionStoreException(14                     "Detected recursive loading of " + encodedResource + " - check your import definitions!");15         }16         try {17             InputStream inputStream = encodedResource.getResource().getInputStream();18             try {19                 InputSource inputSource = new InputSource(inputStream);20                 if (encodedResource.getEncoding() != null) {21                     inputSource.setEncoding(encodedResource.getEncoding());22                 }23                 return doLoadBeanDefinitions(inputSource, encodedResource.getResource());24             }25             finally {26                 inputStream.close();27             }28         }29         catch (IOException ex) {30             throw new BeanDefinitionStoreException(31                     "IOException parsing XML document from " + encodedResource.getResource(), ex);32         }33         finally {34             currentResources.remove(encodedResource);35             if (currentResources.isEmpty()) {36                 this.resourcesCurrentlyBeingLoaded.set(null);37             }38         }39     }

4.读取方法DefaultBeanDefinitionDocumentReader.java

 1     /** 2      * Parses bean definitions according to the "spring-beans" DTD. 3      * <p>Opens a DOM Document; then initializes the default settings 4      * specified at <code>&lt;beans&gt;</code> level; then parses 5      * the contained bean definitions. 6      */ 7     public void registerBeanDefinitions(Document doc, XmlReaderContext readerContext) { 8         this.readerContext = readerContext; 9 10         logger.debug("Loading bean definitions");11         Element root = doc.getDocumentElement();12 13         BeanDefinitionParserDelegate delegate = createHelper(readerContext, root);14 15         preProcessXml(root);16         parseBeanDefinitions(root, delegate);17         postProcessXml(root);18     }