编写
XML的方法如下：
<?xml version="1.0" encoding="UTF-8"?><config> <jdbc> <url>jdbc:mysql://localhost:3306/javabase</url> <driver>com.mysql.jdbc.Driver</driver> <username>java</username> <password>d$7hF_r!9Y</password> </jdbc></config>
假设
config.xml已调用它并将其放置在类路径的根目录中，下面是一个示例，说明如何在
JAXP和
Xpath的帮助下加载它：
InputStream input = Thread.currentThread().getContextClassLoader().getResourceAsStream("config.xml");document document = documentBuilderFactory.newInstance().newdocumentBuilder().parse(new InputSource(input));XPath xpath = XPathFactory.newInstance().newXPath();String url = (String) xpath.compile("//config//jdbc//url").evaluate(document, XPathConstants.STRING);String driver = (String) xpath.compile("//config//jdbc//driver").evaluate(document, XPathConstants.STRING);String username = (String) xpath.compile("//config//jdbc//username").evaluate(document, XPathConstants.STRING);String password = (String) xpath.compile("//config//jdbc//password").evaluate(document, XPathConstants.STRING);// ...与属性文件相比，它只是非常冗长。这是此类属性文件的示例：
jdbc.url = jdbc：mysql：// localhost：3306 / javabasejdbc.driver = com.mysql.jdbc.Driverjdbc.username = Javajdbc.password = d $ 7hF_r！9Y
假设它
config.properties已被命名并放置在类路径的根目录中（或它的根路径已添加到类路径中），这是从类路径中加载它的方法：
Properties properties = new Properties();properties.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("config.properties"));String url = properties.getProperty("jdbc.url");String driver = properties.getProperty("jdbc.driver");String username = properties.getProperty("jdbc.username");String password = properties.getProperty("jdbc.password");// ...
