Java操作XML编程实例解析(3)_Xml教程
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推荐:利用XSLT来换XML的根写程序需要换XML的根,感觉很不便,于是写了一个函数,大致思路及实现如下: 首先觉得利用XSLT还能过滤一些东西,然后再发送回客户端,所以决定采用XSLT 然后就是尝试写一个换根的XSL,如下
private void readXMLFile(String inFile) throws Exception { //为解析XML作准备 //创建DocumentBuilderFactory实例,指定DocumentBuilder DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = null; try { db = dbf.newDocumentBuilder(); } catch (ParserConfigurationException pce) { System.err.println(pce); //出异常时输出异常信息,然后退出,下同 System.exit(1); } Document doc = null; try { doc = db.parse(inFile); } catch (DOMException dom) { System.err.println(dom.getMessage()); System.exit(1); } catch (IOException ioe) { System.err.println(ioe); System.exit(1); } //下面是解析XML的全过程, //比较简单,先取根元素"学生花名册" Element root = doc.getDocumentElement(); //取"学生"元素列表 NodeList students = root.getElementsByTagName("学生"); for (int i = 0; i < students.getLength(); i ) { //依次取每个"学生"元素 Element student = (Element) students.item(i); //创建一个学生的Bean实例 StudentBean studentBean = new StudentBean(); //取学生的性别属性 studentBean.setSex(student.getAttribute("性别")); //取"姓名"元素,下面类同 NodeList names = student.getElementsByTagName("姓名"); if (names.getLength() == 1) { Element e = (Element) names.item(0); Text t = (Text) e.getFirstChild(); studentBean.setName(t.getNodeValue()); }NodeList ages = student.getElementsByTagName("年龄"); if (ages.getLength() == 1) { Element e = (Element) ages.item(0); Text t = (Text) e.getFirstChild(); studentBean.setAge(Integer.parseInt(t.getNodeValue())); }NodeList phones = student.getElementsByTagName("电话"); if (phones.getLength() == 1) { Element e = (Element) phones.item(0); Text t = (Text) e.getFirstChild(); studentBean.setPhone(t.getNodeValue()); }student_Vector.add(studentBean); } }private void writeXMLFile(String outFile) throws Exception { //为解析XML作准备, //创建DocumentBuilderFactory实例,指定DocumentBuilder DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = null; try { db = dbf.newDocumentBuilder(); } catch (ParserConfigurationException pce) { System.err.println(pce); System.exit(1); }Document doc = null; doc = db.newDocument();//下面是建立XML文档内容的过程, /先建立根元素"学生花名册" Element root = doc.createElement("学生花名册"); //根元素添加上文档 doc.appendChild(root);//取学生信息的Bean列表 for (int i = 0; i < student_Vector.size(); i ) { //依次取每个学生的信息 StudentBean studentBean = (StudentBean) student_Vector.get(i); //建立"学生"元素,添加到根元素 Element student = doc.createElement("学生"); student.setAttribute("性别", studentBean.getSex()); root.appendChild(student); //建立"姓名"元素,添加到学生下面,下同 Element name = doc.createElement("姓名"); student.appendChild(name); Text tName = doc.createTextNode(studentBean.getName()); name.appendChild(tName);Element age = doc.createElement("年龄"); student.appendChild(age); Text tAge = doc.createTextNode(String.valueOf(studentBean.getAge())); age.appendChild(tAge);Element phone = doc.createElement("电话"); student.appendChild(phone); Text tPhone = doc.createTextNode(studentBean.getPhone()); phone.appendChild(tPhone); } //把XML文档输出到指定的文件 FileOutputStream outStream = new FileOutputStream(outFile); OutputStreamWriter outWriter = new OutputStreamWriter(outStream); ((XmlDocument) doc).write(outWriter, "GB2312"); outWriter.close(); outStream.close(); } |
最后加入测试主函数,如下:
public static void main(String[] args) throws Exception { //建立测试实例 XMLTest xmlTest = new XMLTest(); //初始化向量列表 xmlTest.student_Vector = new Vector();System.out.println("开始读Input.xml文件"); xmlTest.readXMLFile("Input.xml");System.out.println("读入完毕,开始写Output.xml文件"); xmlTest.writeXMLFile("Output.xml"); System.out.println("写入完成"); } |
好了,保存好StudentBean和XMLTest,把Input.xml保存到工作目录下。可以看到"写入完成"了。
分享:读取XML为行记录以下为引用的内容: 1 declare @x xml 2 set @x='<book genre="security" publicationdate="2002" ISBN="0-7356-1588-2&
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Xml教程-Java操作XML编程实例解析(3)。