通过jdom获取配制在xml文件里的信息

最新推荐文章于 2022-07-18 14:14:57 发布

最新推荐文章于 2022-07-18 14:14:57 发布 · 110 阅读

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本文介绍了一个Java程序如何从XML配置文件中读取特定节点的数据，包括服务器IP和注册端口号，用于实例化并调用注册服务。

public class ReadConfigureXml {

	private Element rootElement = null;

	public Element getRootElement() {
		return rootElement;
	}

	public ReadConfigureXml(String xmlName) {
		SAXBuilder builder = new SAXBuilder();
		try {
			Document doc = builder.build(Thread.currentThread()
					.getContextClassLoader().getResourceAsStream(xmlName));
			rootElement = doc.getRootElement(); //返回根元素，然后用XPath通过这个根元素，直接获取xml文件里定义的数据
		} catch (JDOMException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}

使用：

public class Crawler {

	private String crawlId = null;

	private static final String SERVER_FILE_NAME = "server.xml";

	public void crawlerReg(IRegister reg) {

		if (crawlId == null) {

			Element ipElement = null;
			Element portElement = null;
			ReadConfigureXml read = new ReadConfigureXml(SERVER_FILE_NAME);

			Element rootElement = read.getRootElement();
			try {
				ipElement = (Element) XPath.selectSingleNode(rootElement, "//configure/server/ip");//获得ip地址
				portElement = (Element) XPath.selectSingleNode(rootElement, "//configure/server/register-port");//获得port号
			} catch (JDOMException e) {
				e.printStackTrace();
			}
			crawlId = reg.register(ipElement.getText(),Integer.parseInt(portElement.getText()));
System.out.println("CrawlId is : " + crawlId);

		}
	}

	public static void main(String[] args) {

		Crawler crawler = new Crawler();

		IRegister reg = new RegisterImpl();

		crawler.crawlerReg(reg);

	}

}

<?xml version="1.0" encoding="utf-8"?>
	<configure>

		<server>
			<ip>10.0.0.166</ip>
			<register-port>5678</register-port>
			<geturls-port></geturls-port>
		</server>

	</configure>