27XML---JDOM

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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();

解析XML文档

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DocumentDocument d = domReader.read(document);Element rootElement = d.getRootElement();System.out.println(rootElement.getName());

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