dom4j解析xml

public static void m1() throws IOException {
		Document doc = DocumentHelper.createDocument();
		// 增加根节点
		Element books = doc.addElement("books");
		// 增加子元素
		Element book1 = books.addElement("book");
		Element title1 = book1.addElement("title");
		Element author1 = book1.addElement("author");

		Element book2 = books.addElement("book");
		Element title2 = book2.addElement("title");
		Element author2 = book2.addElement("author");

		// 为子节点添加属性
		book1.addAttribute("id", "001");
		// 为元素添加内容
		title1.setText("Harry Potter");
		author1.setText("J K. Rowling");

		book2.addAttribute("id", "002");
		title2.setText("Learning XML");
		author2.setText("Erik T. Ray");

		// 实例化输出格式对象
		OutputFormat format = OutputFormat.createPrettyPrint();
		// 设置输出编码
		format.setEncoding("UTF-8");
		// 创建需要写入的File对象
		File file = new File("/opt/share/books.xml");
		// 生成XMLWriter对象，构造函数中的参数为需要输出的文件流和格式
		XMLWriter writer = new XMLWriter(new FileOutputStream(file), format);
		// 开始写入，write方法中包含上面创建的Document对象
		writer.write(doc);
	}

	public static void m2() throws DocumentException {
		SAXReader reader = new SAXReader();
		Document document = reader.read(new File("/opt/share/xxx.xml"));
		Element root = document.getRootElement();

		Iterator it = root.elementIterator();
		while (it.hasNext()) {
			Element element = (Element) it.next();

			// 未知属性名称情况下
			/*
			 * Iterator attrIt = element.attributeIterator(); while (attrIt.hasNext()) {
			 * Attribute a = (Attribute) attrIt.next(); System.out.println(a.getValue()); }
			 */

			// 已知属性名称情况下
			System.out.println("id: " + element.attributeValue("id"));

			// 未知元素名情况下
			/*
			 * Iterator eleIt = element.elementIterator(); while (eleIt.hasNext()) { Element
			 * e = (Element) eleIt.next(); System.out.println(e.getName() + ": " +
			 * e.getText()); } System.out.println();
			 */

			// 已知元素名情况下
			System.out.println("title: " + element.elementText("title"));
			System.out.println("author: " + element.elementText("author"));
			System.out.println();
		}
	}