Input.xml
代码:
<?xml version="1.0" encoding="UTF-8"?>
<学生花名册>
<学生 性别 = "男">
<姓名>李华</姓名>
<年龄>14</年龄>
<电话>6287555</电话>
</学生>
<学生 性别 = "男">
<姓名>张三</姓名>
<年龄>16</年龄>
<电话>8273425</电话>
</学生>
</学生花名册>
StudentBean.java //保存学生信息
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; }
}
TESTXml.java
import java.io.*;
import java.util.*;
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
public class XMLTest {
Vector student_Vector;//为了保存多个学生信息，还得借助一个集合类(并不是单纯意义上的集合，JAVA中的集合是集合框架的概念，包含向量、列表、哈希表等)，这里采用Vector向量类。
XMLTest() { }
private void readXMLFile(String inFile) throws Exception {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();//为解析XML作准备，创建DocumentBuilderFactory实例,指定DocumentBuilder
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
Element root = doc.getDocumentElement();//先取根元素"学生花名册"
NodeList students = root.getElementsByTagName("学生");//取"学生"元素列表
for (int i = 0; i < students.getLength(); i++) {
Element student = (Element) students.item(i);//依次取每个"学生"元素
StudentBean studentBean = new StudentBean();//创建一个学生的Bean实例
studentBean.setSex(student.getAttribute("性别"));//取学生的性别属性
NodeList names = student.getElementsByTagName("姓名");//取"姓名"元素，下面类同
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);//将学生添加到集合
}
}
private void writeXMLFile(String outFile) throws Exception {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();//为解析XML作准备，创建DocumentBuilderFactory实例,指定DocumentBuilder
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
Element root = doc.createElement("学生花名册");//先建立根元素"学生花名册"
doc.appendChild(root);//根元素添加上文档
//取学生信息的Bean列表
for (int i = 0; i < student_Vector.size(); i++) {
StudentBean studentBean = (StudentBean) student_Vector.get(i);//依次取每个学生的信息
//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, "UTF-8");
outWriter.close();
outStream.close();
}
public static void main(String[] args) throws Exception {
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");
System.in.read();
}
}