创建XML文档，添加DOM节点

package topicclassifier;

import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;

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.Text;

public class XMLTool {

DocumentBuilderFactory factory;
DocumentBuilder builder;
Document doc;

public XMLTool(String filePath)throws Exception {
  factory = DocumentBuilderFactory.newInstance();
  builder = factory.newDocumentBuilder();
  doc = builder.parse(filePath);
}


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();
  }
}

public static boolean createXML(String filePath)
{
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder=null;
    try {
     builder = dbf.newDocumentBuilder();
    } catch(Exception e){
     e.printStackTrace();
     return false;
    }
    Document doc = builder.newDocument();
    Element root = doc.createElement_x("info");
    doc.appendChild(root); //将根元素添加到文档上
    try {
     FileOutputStream fos = new FileOutputStream(filePath);
     OutputStreamWriter outwriter = new OutputStreamWriter(fos);
     callWriteXmlFile(doc,outwriter,"gb2312");
     outwriter.close();
     fos.close();
     return true;
    } catch (Exception e) {
     e.printStackTrace();
     return false;
    }
}

public void addForm(FormWraper fw){
 
  Element form = doc.createElement_x("form");
  form.setAttribute("ID", "1");
  form.setAttribute("name", "form1");
  Element text = doc.createElement_x("text");
  form.appendChild(text);
  Element attr1 = doc.createElement_x("attr");
  attr1.setAttribute("label", "书名");
  attr1.setAttribute("name", "key");
  text.appendChild(attr1);
  Element   root   =   doc.getDocumentElement();
  root.normalize();
  root.appendChild(form);
    try {
      FileOutputStream fos = new FileOutputStream("D:/forminfo.txt");
      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) {
  // TODO Auto-generated method stub
  String filePath = "D:/forminfo.txt";
  XMLTool.createXML(filePath);
  try {
   XMLTool xt = new XMLTool(filePath);
   xt.addForm(new FormWraper());
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
}

}


文章转载自http://blog.sina.com.cn/s/blog_49b05ad00100gcok.html