package xml;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Iterator;
import java.util.Vector;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
public class DomTest {
Vector students_Vector;
private Vector readXMLFile(String file) throws Exception {
if(file == null){
System.out.println("没找到文件!");
System.exit(1);
}
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = dbf.newDocumentBuilder();
Document doc = builder.parse(file); // 获取到xml文件
Element root = doc.getDocumentElement(); // 获取根元素
NodeList students = root.getElementsByTagName("学生");
students_Vector = new Vector();
for (int i = 0; i < students.getLength(); i++) {
// 一次取得每一个学生元素
Element ss = (Element) students.item(i);
// 创建一个学生的实例
student stu = new student();
stu.setSex(ss.getAttribute("性别"));
NodeList names = ss.getElementsByTagName("姓名");
Element e = (Element) names.item(0);
Node t = e.getFirstChild();
stu.setName(t.getNodeValue());
NodeList ages = ss.getElementsByTagName("年龄");
e = (Element) ages.item(0);
t = e.getFirstChild();
stu.setAge(Integer.parseInt(t.getNodeValue()));
students_Vector.add(stu);
}
return students_Vector;
}
// 写入ｘｍｌ文件
public static void callWriteXmlFile(Document doc, Writer w, String encoding) {
try {
Source source = new DOMSource(doc);
Result result = new StreamResult(w);
Transformer xformer = TransformerFactory.newInstance()
.newTransformer();
xformer.setOutputProperty(OutputKeys.ENCODING, encoding);
xformer.transform(source, result);
} catch (TransformerConfigurationException e) {
e.printStackTrace();
} catch (TransformerException e) {
e.printStackTrace();
}
}
private void writeXMLFile(String outfile) {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
try {
builder = dbf.newDocumentBuilder();
} catch (Exception e) {
}
Document doc = builder.newDocument();
Element root = doc.createElement("学生花名册");
doc.appendChild(root); // 将根元素添加到文档上
// 获取学生信息
for (int i = 0; i < students_Vector.size(); i++) {
student s = (student) students_Vector.get(i);
// 创建一个学生
Element stu = doc.createElement("学生");
stu.setAttribute("性别", s.getSex());
root.appendChild(stu);// 添加属性
// 创建文本姓名节点
Element name = doc.createElement("姓名");
stu.appendChild(name);
Text tname = doc.createTextNode(s.getName());
name.appendChild(tname);
//创建文本年龄节点
Element age = doc.createElement("年龄");
stu.appendChild(age); // 将age添加到学生节点上
Text tage = doc.createTextNode(String.valueOf(s.getAge()));
age.appendChild(tage); // 将文本节点放在age节点上
}
try {
FileOutputStream fos = new FileOutputStream(outfile);
OutputStreamWriter outwriter = new OutputStreamWriter(fos);
// ((XmlDocument)doc).write(outwriter); //出错！
callWriteXmlFile(doc, outwriter, "gb2312");
outwriter.close();
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String args[]) {
String str = "c:\\java\\test.xml";
DomTest t = new DomTest();
try {
Vector v = t.readXMLFile(str);
Iterator it = v.iterator();
while (it.hasNext()) {
student s = (student) it.next();
System.out.println(s.getName() + "\t" + s.getAge() + "\t"
+ s.getSex());
}
} catch (Exception e) {
e.printStackTrace();
}
String outfile = "stucopy.xml";
t.writeXMLFile(outfile);
}
}
class student{
private String sex;
private String name;
private int age;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public void setSex(String s){sex=s;}
public String getSex(){return sex;}
public void setName(String n){name=n;}
public String getName(){return name;}
}
编译：javac -d . DomTest.java
调用：java xml.DomTest