<学生花名册> 

<学生 性别 = "男"> 

<姓名>李华  

<年龄>14 

<电话>6287555 

<学生 性别 = "男"> 

<姓名>张三 

<年龄>16 

<电话>8273425 

public class StudentBean { 

private String sex; //学生性别 

private String name; //学生姓名 

private int age; //学生年龄 

private String phone; //电话号码 

public void setSex(String s) { 

sex = s; 

} 

public void setName(String s) { 

name = s; 

} 

public void setAge(int a) { 

age = a; 

} 

public void setPhone(String s) { 

phone = s; 

} 

public String getSex() { 

return sex; 

} 

public String getName() { 

return name; 

} 

public int getAge() { 

return age; 

}  

public String getPhone() { 

return phone; 

} 

}

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;//写XML文件要用到

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); 

}

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();  

}

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"); 

}