小试dom对xml的操作

最新推荐文章于 2024-06-07 18:09:08 发布

最新推荐文章于 2024-06-07 18:09:08 发布 · 104 阅读

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本文提供了一个使用Java DOM API操作XML文件的示例程序。该程序包括读取XML文件、添加新的元素节点到XML文件中，并将修改后的XML保存到文件等功能。通过此示例可以了解如何使用DOM API进行基本的XML文件操作。

dom对xml的操作:
[code]
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.xml.sax.*;
import java.io.*;
import org.w3c.dom.*;

public class control implements java.io.Serializable {
private static String xmlStr="";
private static int index=3;
//private static final String PATH="file:///";

public control() {
}

public String getString(){
return xmlStr;
}

public static Document getDocument(String filename) throws Exception {
xmlStr="";
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
// 设定解析的叁数
dbf.setIgnoringComments(true);
dbf.setIgnoringElementContentWhitespace(true);
DocumentBuilder db = dbf.newDocumentBuilder();
//导入XML文件
Document doc = db.parse(filename);
return doc;
}

public int addElement(Node node,String name,String sex,String age, String tel){

Element oRoot=((Document)node).getDocumentElement();

Element ename =((Document)node).createElement("name");
Text tname =((Document)node).createTextNode(name);
ename.appendChild(tname);

Element esex = ((Document)node).createElement("sex");
Text tsex = ((Document)node).createTextNode(sex);
esex.appendChild(tsex);

Element eage = ((Document)node).createElement("age");
Text tage = ((Document)node).createTextNode(age);
eage.appendChild(tage);

Element etel = ((Document)node).createElement("tel");
Text ttel = ((Document)node).createTextNode(tel);
etel.appendChild(ttel);

Element stu =((Document)node).createElement("student");
stu.setAttribute("id",Integer.toString(index));
index++;
stu.appendChild(ename);
stu.appendChild(esex);
stu.appendChild(eage);
stu.appendChild(etel);

oRoot.appendChild(stu);
save((Document)node);
if(stu==null) return 0;
return 1;
}

public void traverseTree(Node node) throws Exception {
if(node == null) {
return;
}
int type = node.getNodeType();

switch (type) {

// handle document nodes
case Node.DOCUMENT_NODE: {
xmlStr+="<tr>";
traverseTree(((Document)node).getDocumentElement());
break;
}

// handle element nodes
case Node.ELEMENT_NODE: {
String elementName = node.getNodeName();
if(elementName.equals("student")) {
xmlStr+="</tr><tr>";
}
NodeList childNodes =node.getChildNodes();
if(childNodes != null) {
int length = childNodes.getLength();
for (int loopIndex = 0; loopIndex <length ; loopIndex++)
{
traverseTree(childNodes.item(loopIndex));
}
}
break;
}

// handle text nodes
case Node.TEXT_NODE: {
String data = node.getNodeValue().trim();
if((data.indexOf(" ") <0) && (data.length()> 0)) {
xmlStr+="<td>"+data+"</td>";
}
}
}
}
//增加的保存操作
private void save(Document doc){
try{
TransformerFactory tFactory =TransformerFactory.newInstance();
Transformer transformer = tFactory.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(new java.io.File("ok.xml"));
transformer.transform(source, result);
}catch(TransformerConfigurationException e)
{
e.printStackTrace();
}catch(TransformerException e)
{
e.printStackTrace();
}

}

public static void main(String []args){
control ctrl = new control();
try{
Document doc = ctrl.getDocument("ok.xml");
String name = "haha";
String sex = "female";
String age = "22";
String tel = "23256";

int i=ctrl.addElement(doc,name,sex,age,tel);
Element oRoot=(doc).getDocumentElement();
ctrl.traverseTree(oRoot);
String str = ctrl.getString();
System.out.println(str);

}catch(Exception e){
e.printStackTrace();
}
}
}
[/code]