Java使用DOM4J解析XML

Dom4J方式解析XML文件。dom4j是非官方提供的xml文件解析方式，因此需要去第三方下载dom4j的jar包

File file = new File("D:\\chengmuzhe\\java\\JavaOOP6.0\\students.xml");
	SAXReader reader = new SAXReader();
	Document document = reader.read(file);
	Element root = document.getRootElement();
	try {
		System.out.println("学生信息:");
		for (Iterator iterator = root.elementIterator(); iterator.hasNext();) {
			Element element = (Element) iterator.next();
			String ids = element.elementText("stuId");
			
			System.out.println(ids);
			String names = element.elementText("stuName");
			System.out.println(names);
			String age = element.elementText("age");
			System.out.println(age);
			
		}
	} catch (Exception e) {
		// TODO: handle exception
	}

读XML是还有一种方法就是使用Document的selectNodes来查找节点

使用这个方法是需要另外的包

导入xPath支持的jar包。jaxen-1.1-beta-6.jar(首先要先导入dom4j包，dom4j下载地址：http://www.dom4j.org/dom4j-1.6.1/)。下载jdom时在解压后的lib下

---

List lists = document.selectNodes("//students");
		Iterator iter = lists.iterator();
		while (iter.hasNext()) {
			Element element = (Element) iter.next();
				String ids = element.elementText("stuId");

			System.out.println(ids);
			String names = element.elementText("stuName");
			System.out.println(names);
			String age = element.elementText("age");
			System.out.println(age);
		
	}

写XML

Document document = DocumentHelper.createDocument();
	Element element = document.addElement("students");
	Element studentElement = element.addElement("student");
	studentElement.addAttribute("email", "[e-mail]");
	Element idElement = studentElement.addElement("stuId");
	idElement.setText("55");
	Element nameElement = studentElement.addElement("stuName");
	idElement.setText("55Name");
	Element ageElement = studentElement.addElement("age");
	ageElement.setText("55");
	try {
		XMLWriter output = new XMLWriter(new FileWriter(new File(
				"students2.xml")));
		output.write(document);
		output.close();
	} catch (IOException e) {
		System.out.println(e.getMessage());
	}