使用dom4j操作xml

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1） Xml中元素与dom4j中类和属性的对应关系

Document ：对应整个xml文件

Element ： xml中的一对尖括号

attribute：一个尖括号中的键值对

text：一对尖括号之间的内容

2）生成一个xml文件

        //创建一个xml文件对应的document对象Document document = DocumentHelper.createDocument();Element root = DocumentHelper.createElement("dota");//将root设置为根节点document.setRootElement(root);//为root添加子节点“天灾”root.addElement("天灾");//为root添加子节点“近卫”Element jinwei = root.addElement("近卫");jinwei.addAttribute("direction", "south-east");jinwei.addAttribute("member", "allmost animal");jinwei.addAttribute("typical", "df");jinwei.setText("for my father the king！");//为jinwei添加子节点“智力型”Element intelligence = jinwei.addElement("智力型");intelligence.addAttribute("智力", "大于100");//为intelligence添加子节点“qop”Element qop = intelligence.addElement("qop");qop.addAttribute("blink", "distance 500");//设置xml文件的输出格式OutputFormat format = new OutputFormat();        format.setEncoding("UTF-8");//设置xml为utf-8编码        format.setNewlines(true);//设置xml换行        format.setIndent(true);//设置缩进    XMLWriter xmlWriter = null;try {xmlWriter = new XMLWriter(new FileOutputStream(new File("first.xml")), format);xmlWriter.write(document);}catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally{try {xmlWriter.close();} catch (IOException e) {e.printStackTrace();}}

3）递归解析xml

        @Testpublic void readXml(){SAXReader reader = new SAXReader();Document document = null;try {        document = reader.read(new File("first.xml"));        //获取根节点        Element root = document.getRootElement();        analysisXml(root);} catch (DocumentException e) {e.printStackTrace();}}private void analysisXml(Element e){for(Iterator<Element> it=e.elementIterator(); it.hasNext();){Element child =  it.next();log.log(Level.INFO, child.getName());Iterator<Element> i = child.elementIterator();//如果hasNext为true，则说明有子节点if(i.hasNext())analysisXml(child);}}

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