由xml和Document的标准操作

xml 到Documetn
java 代码

public XmlFileConfigurationStrategy(File xmlSource//TODO validate should be used
    throws ConfigurationException {
    Helper.checkObject(xmlSource, "xmlSource");

    try {
        xmlDocument = createDocumentBuilder().parse(xmlSource);
    } catch (SAXException e) {
        throw new ConfigurationException("error occurred during parsing file", e);
    } catch (IOException e) {
        throw new ConfigurationException("error occurred during reading file", e);
    }
}

/**
 * Get a xml document builder. Common operations of the two constructors.
 *
 * @return created document builder
 *
 * @throws ConfigurationException if error occurs during creating document builder
 */
private DocumentBuilder createDocumentBuilder() throws ConfigurationException {
    try {
        DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        builder.setErrorHandler(new XMLFilterImpl());

        return builder;
    } catch (ParserConfigurationException e) {
        throw new ConfigurationException("error occurred during creating document builder");
    }
}