27XML---JDOM

输出 创建XML 保存

		Document document = new Document();

		Element root = new Element("root");

		document.addContent(root);

		Comment comment = new Comment("This is my comments");

		root.addContent(comment);

		Element e = new Element("hello");

		e.setAttribute("sohu","www.sohu.com");

		root.addContent(e);

		Element e2 = new Element("world");

		Attribute attr = new Attribute("test","hehe");

		e2.setAttribute(attr);

		e.addContent(e2);

		e2.addContent(new Element("aaa").setAttribute("a","b")
				.setAttribute("x","y").setAttribute("gg","hh").setText("text content"));

		
		Format format = Format.getPrettyFormat();
		
		format.setIndent("    ");
//		format.setEncoding("gbk");
		
		XMLOutputter out = new XMLOutputter(format);

		out.output(document,new FileWriter("jdom.xml"));
		

输入 读取XML 解析

		SAXBuilder builder = new SAXBuilder();
		
		Document doc = builder.build(new File("jdom.xml"));
		
		Element element = doc.getRootElement();
		
		System.out.println(element.getName());
		
		Element hello = element.getChild("hello");
		
		System.out.println(hello.getText());
		
		List list = hello.getAttributes();
		
		for(int i = 0 ;i < list.size(); i++)
		{
			Attribute attr = (Attribute)list.get(i);
			
			String attrName = attr.getName();
			String attrValue = attr.getValue();
			
			System.out.println(attrName + "=" + attrValue);
		}
		
		hello.removeChild("world");
		
		XMLOutputter out = new XMLOutputter(Format.getPrettyFormat().setIndent("    "));
		
		
		out.output(doc,new FileOutputStream("jdom2.xml"));		
		

1 对于Jdom的format类的getRawFormat方法，通常用于 XML数据的网络传输，这种格式会去掉不必要的空格，减少数据量。

2dom4j(www.dom4j.org)

dom4j 创建XML文档

// 创建文档并设置文档的根元素节点 ：第一种方式
		// Document document = DocumentHelper.createDocument();
		//
		// Element root = DocumentHelper.createElement("student");
		//
		// document.setRootElement(root);

		// 创建文档并设置文档的根元素节点 ：第二种方式
		Element root = DocumentHelper.createElement("student");
		Document document = DocumentHelper.createDocument(root);

		root.addAttribute("name","zhangsan");

		Element helloElement = root.addElement("hello");
		Element worldElement = root.addElement("world");

		helloElement.setText("hello");
		worldElement.setText("world");

		helloElement.addAttribute("age","20");

		XMLWriter xmlWriter = new XMLWriter();
		xmlWriter.write(document);
		
		OutputFormat format = new OutputFormat("    ",true);
		
		XMLWriter xmlWriter2 = new XMLWriter(new FileOutputStream("student2.xml"),format);
		xmlWriter2.write(document);
		
		XMLWriter xmlWriter3 = new XMLWriter(new FileWriter("student3.xml"),format);
		
		xmlWriter3.write(document);
		xmlWriter3.close();

SAXReader saxReader = new SAXReader();
		
		Document doc = saxReader.read(new File("student2.xml"));
		
		Element root = doc.getRootElement();
		
		System.out.println("root element: " + root.getName());
		
		List childList = root.elements();
		
		System.out.println(childList.size());
		
		List childList2 = root.elements("hello");
		
		System.out.println(childList2.size());
		
		Element first = root.element("hello");
		
		System.out.println(first.attributeValue("age"));
		
		for(Iterator iter = root.elementIterator(); iter.hasNext();)
		{
			Element e = (Element)iter.next();
			
			System.out.println(e.attributeValue("age"));
		}
		
		System.out.println("---------------------------");
		
		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
		DocumentBuilder db = dbf.newDocumentBuilder();
		org.w3c.dom.Document document = db.parse(new File("student2.xml"));
		
		DOMReader domReader = new DOMReader();
		
		//将JAXP的Document转换为dom4j的Document
		Document d = domReader.read(document);
		
		Element rootElement = d.getRootElement();
		
		System.out.println(rootElement.getName());
		
		

（编辑：李大同）

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