XML入门级...

Input.xml-----------

 <?xml version="1.0" encoding="gb2312"?><studentList><student sex="man"><name>wgy</name><age>23</age><tel>12345678</tel></student><student sex="female"><name>lemon</name><age>23</age><tel>87654211</tel></student></studentList>

 

 

StudentBean.java ---------

 

package com.bean;public class StudentBean {private String sex;private String name;private int age;private String tel;public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getTel() {return tel;}public void setTel(String tel) {this.tel = tel;}}

 

 

 XMLTest.java ------------

 

package com.test;import java.io.*;import java.util.*;import javax.xml.parsers.*;import org.w3c.dom.*;import com.bean.StudentBean;import org.apache.crimson.tree.XmlDocument;public class XMLTest {static Vector<StudentBean> student_Vector = new Vector<StudentBean>();private void readXMLFile(String inFile) throws Exception{//为解析XML作准备//创建DocumentBuilderFactory实例,指定DocumentBuilderDocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();DocumentBuilder db = null;try{db = dbf.newDocumentBuilder();}catch(ParserConfigurationException pcfe){//出异常时输出异常信息，然后退出，下同System.err.print(pcfe);System.exit(1);}Document doc = null;try{doc = db.parse(inFile);}catch(DOMException dom){System.err.print(dom);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("student");//依次取得每个 学生 元素for(int i=0;i<students.getLength();i++){Element student = (Element) students.item(i);//创建一个学生实例StudentBean studentBean = new StudentBean();//取得学生的性别属性studentBean.setSex(student.getAttribute("sex"));//取”姓名”元素，下面类同NodeList names = student.getElementsByTagName("name");if(names.getLength() == 1){Element e = (Element)names.item(0);Text t = (Text) e.getFirstChild();studentBean.setName(t.getNodeValue());}NodeList ages = student.getElementsByTagName("age");if(ages.getLength() == 1){Element e = (Element)ages.item(0);Text t = (Text) e.getFirstChild();studentBean.setAge(Integer.parseInt(t.getNodeValue()));}NodeList tels = student.getElementsByTagName("tel");if(tels.getLength() == 1){Element e = (Element) tels.item(0);Text t = (Text) e.getFirstChild();studentBean.setTel(t.getNodeValue());}student_Vector.add(studentBean);}}private void writeXMLFile(String outFile) throws Exception{DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();DocumentBuilder db = null;try{db = dbf.newDocumentBuilder();}catch(ParserConfigurationException pce){System.err.print(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”studentList”Element root = doc.createElement("studentList");//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 = student_Vector.get(i);//建立学生元素，添加到根元素Element student = doc.createElement("student");student.setAttribute("sex", studentBean.getSex());root.appendChild(student);//建立姓名元素，添加到学生下面，下同Element name = doc.createElement("name");student.appendChild(name);Text tName = doc.createTextNode(studentBean.getName());name.appendChild(tName);Element age = doc.createElement("age");student.appendChild(age);Text tAge = doc.createTextNode(String.valueOf(studentBean.getAge()));age.appendChild(tAge);Element tel = doc.createElement("tel");student.appendChild(tel);Text tTel = doc.createTextNode(studentBean.getTel());tel.appendChild(tTel);}//把XML文档输出到指定的文件FileOutputStream os = new FileOutputStream(outFile);OutputStreamWriter osw = new OutputStreamWriter(os);((XmlDocument) doc).write(osw,"gb2312");osw.close();os.close();}public static void main(String[] args) {//建立测试实例XMLTest xmtTest = new XMLTest();//初始化向量列表//XMLTest.student_Vector = new Vector();XMLTest.student_Vector = new Vector();System.out.println("Read to read Input.xml file...");try {xmtTest.readXMLFile("Input.xml");} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println("Finished, and begin writing out to the Output.xml");try {xmtTest.writeXMLFile("Output.doc");} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println("Finished...");}}