java生成XML（实用）

package com.feiyue.dom; import java.io.*; //Java基础包，包含各种IO操作 import java.util.*; //Java基础包，包含各种标准数据结构操作 import javax.xml.parsers.*; //XML解析器接口 import org.w3c.dom.*; //XML的DOM实现 import org.apache.crimson.tree.XmlDocument; public class XMLTest{ 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"); Vector student_Vector=new Vector(); 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 = 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); Vector student_Vector=new Vector(); for(int i=1;i<=5;i++){ StudentBean student=new StudentBean(); student.setAge(i); student.setName(i+"名字"); student.setPhone(i+"电话"); student.setSex("女"); student_Vector.add(student); } //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(); } 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"); } }