Dom2file

Question

// demo.xml
/*<?xml version="1.0" standalone="yes"?>
<!DOCTYPE folks [
<!ELEMENT folks (person)*>
<!ELEMENT person (name | phone | email)*>
<!ELEMENT name (#PCDATA | bold)*>
<!ELEMENT phone (#PCDATA)>
<!ELEMENT email (#PCDATA)>
<!ELEMENT bold (#PCDATA)>
]>
<folks>
    <person>
        <name>Sam Spade</name>
        <email>[email protected]</email>
    </person>
    <person>
        <name>Sam Diamond</name>
        <email>[email protected]</email>
    </person>
    <person>
        <name>Sam Sonite</name>
        <email>[email protected]</email>
    </person>
</folks>*/
import java.io.FileOutputStream;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Attr;
import org.w3c.dom.CDATASection;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.ProcessingInstruction;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import com.sun.xml.tree.*;
import org.w3c.dom.*;
import java.io.*;
import java.util.*;
import java.net.*;
import org.apache.xml.serialize.*;
public class BuildXml {
  private Document document;
  private InputStream is;
  private String filename = "demo.xml";
  public BuildXml() {
     getDocument(filename);
     changeContent(document, "Sam Diamond", "[email protected]");   
     toFile(toXML(document));
  public void getDocument(String file) {
      try {
        is = new FileInputStream(file); 
        document = XmlDocumentBuilder.createXmlDocument(is, true);
      catch (Exception e) {
        e.printStackTrace();
  public void changeContent(Document doc, String newname, String newemail) {
    Element root = doc.getDocumentElement();
    NodeList rootlist = root.getChildNodes();
    for (int i=0; i<rootlist.getLength(); i++) {
        Element person = (Element)rootlist.item(i);
        NodeList personlist = person.getChildNodes();
        Element name = (Element)personlist.item(0);
        NodeList namelist = name.getChildNodes();
        Text nametext = (Text)namelist.item(0);
        String oldname = nametext.getData();
        if (oldname.equals(newname)) {
            Element email = (Element)personlist.item(1);
            NodeList emaillist = email.getChildNodes();
            Text emailtext = (Text)emaillist.item(0);
            emailtext.setData(newemail);
  public void toFile(String s) {
    try {
        BufferedWriter out = new BufferedWriter(new FileWriter(filename));
        out.write(s);
        out.close();
    catch (IOException e) {
  public String toXML(Document doc) {
    if (doc == null)
        return "";
    OutputFormat format  = new OutputFormat(doc);
    format.setIndenting(true);
    StringWriter stringOut = new StringWriter();
    XMLSerializer serial = new XMLSerializer(stringOut, format);
    try {
        serial.asDOMSerializer();
        serial.serialize(doc.getDocumentElement());       
    catch (IOException IOe) {
    return stringOut.toString();
public static void main(String args[]) {
    BuildXml buildXml = new BuildXml();
}// error line : serial.serialize(doc.getDocumentElement());

Answer 1

Do you have a question about that code?