DocumentLoader 將Bean 配置資源轉(zhuǎn)換成Document 對(duì)象的源碼如下：

//使用標(biāo)準(zhǔn)的JAXP將載入的Bean定義資源轉(zhuǎn)換成document對(duì)象 @Override public Document loadDocument(InputSource inputSource, EntityResolver entityResolver,ErrorHandler errorHandler, int validationMode, boolean namespaceAware) throws Exception {//創(chuàng)建文件解析器工廠(chǎng)DocumentBuilderFactory factory = createDocumentBuilderFactory(validationMode, namespaceAware);if (logger.isDebugEnabled()) {logger.debug("Using JAXP provider [" + factory.getClass().getName() + "]");}//創(chuàng)建文檔解析器DocumentBuilder builder = createDocumentBuilder(factory, entityResolver, errorHandler);//解析Spring的Bean定義資源return builder.parse(inputSource); }protected DocumentBuilderFactory createDocumentBuilderFactory(int validationMode, boolean namespaceAware)throws ParserConfigurationException {//創(chuàng)建文檔解析工廠(chǎng)DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();factory.setNamespaceAware(namespaceAware);//設(shè)置解析XML的校驗(yàn)if (validationMode != XmlValidationModeDetector.VALIDATION_NONE) {factory.setValidating(true);if (validationMode == XmlValidationModeDetector.VALIDATION_XSD) {// Enforce namespace aware for XSD...factory.setNamespaceAware(true);try {factory.setAttribute(SCHEMA_LANGUAGE_ATTRIBUTE, XSD_SCHEMA_LANGUAGE);}catch (IllegalArgumentException ex) {ParserConfigurationException pcex = new ParserConfigurationException("Unable to validate using XSD: Your JAXP provider [" + factory +"] does not support XML Schema. Are you running on Java 1.4 with Apache Crimson? " +"Upgrade to Apache Xerces (or Java 1.5) for full XSD support.");pcex.initCause(ex);throw pcex;}}}return factory; }

上面的解析過(guò)程是調(diào)用JavaEE 標(biāo)準(zhǔn)的JAXP 標(biāo)準(zhǔn)進(jìn)行處理。至此Spring IOC 容器根據(jù)定位的Bean 配置信息，將其加載讀入并轉(zhuǎn)換成為Document 對(duì)象過(guò)程完成。接下來(lái)我們要繼續(xù)分析Spring IOC 容器將載入的Bean 配置信息轉(zhuǎn)換為Document 對(duì)象之后，是如何將其解析為Spring IOC 管理的Bean 對(duì)象并將其注冊(cè)到容器中的。

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