To write to a particular position in file

Question

I have to write objects involved with the diagram in to a XML file.as new components are drawn in the diagram corresponding objects will get added to XML file.For the Object to xml conversion i am using Xstream API.
In have to insert this portion
*<Rstmain.gui.TextRectangle>*
  *<x>15</x>*
  *<y>2350</y>*
  *<width>110</width>*
  *<height>63</height>*
  *<rectNo>0</rectNo>*
  *<text__Rectangle>With its distant orbit-50 percent farther from the sun </text__Rectangle>*
*</Rstmain.gui.TextRectangle>*
above </temp>
*<temp>*
<string-array>
  <string>With its distant orbit-50 percent farther from the sun </string>
  <string>than earth-and slim atmospheric blanket,mars experiences frigid weather conditions.Surface temperatures typically average about -60 d</string>
  <string>egrees Celsius(-76 degrees Fahrenheit)at the equator and can dip to -123 degrees C nea</string>
  <string>r the poles.Only the midday sun at tropic</string>
  <string>al lattitudes is warm enough to thaw ice on occasion,but any liquid water formed in </string>
  <string>this way would evaporate almost </string>
  <string>instantly because of low atmospheric pressure. </string>
</string-array>
<int-array>
  <int>55</int>
  <int>189</int>
  <int>276</int>
  <int>318</int>
  <int>403</int>
  <int>436</int>
  <int>485</int>
</int-array>
*</temp>*
<Rstmain.gui.TextRectangle>
  <x>15</x>
  <y>2350</y>
  <width>110</width>
  <height>63</height>
  <rectNo>0</rectNo>
  <text__Rectangle>With its distant orbit-50 percent farther from the sun </text__Rectangle>
</Rstmain.gui.TextRectangle>I cant use random access file for this because the lines in xml file are not of equal length.
currently i am using this approach.convert each object separately to xml and then write to a file.
tempOut = new BufferedWriter(new FileWriter(tempFileXML, true));
                     tempOut.newLine();
                    String txtRectXml = stream.toXML(textRectangle);
                    tempOut.write(txtRectXml);
                    tempOut.close();please suggest some method for solving my problem...

Answer 1

Thanks...I could solve it by another approach...
Hope it will be helpful for others
create Root Node first.tempFileXML is the fileName here.
String root="temp";
        documentBuilderFactory = DocumentBuilderFactory.newInstance();
        documentBuilder = documentBuilderFactory.newDocumentBuilder();
        document = documentBuilder.newDocument();
        rootElement = document.createElement(root);
        document.appendChild(rootElement);
        writeXmlFile(document,tempFileXML);//writing document to file...
         For appending one document to another
txtXml is string Object comprising a xml document
txtXml is
<string-array>
  <string>With its distant orbit-50 percent farther from the sun than</string>
  <string> earth-and slim atmospheric blanket,mars experiences frigid weather conditions.Surface temperatures typically average</string>
  <string> about -60 degrees Celsius(-76 degrees Fahrenheit)at the equator and can dip to -123 degrees C near the poles.</string>
  <string>Only the midday sun at tropical lattitudes is warm </string>
  <string>enough to thaw ice on occasion,but any liquid water formed in this way</string>
  <string> would evaporate almost instantly because of low atmospheric pressure. </string>
</string-array>
//Creating new instances of document builder factory
            documentBuilderFactory2 = DocumentBuilderFactory.newInstance();
            documentBuilder2 = documentBuilderFactory.newDocumentBuilder();
           inStream = new InputSource();
           inStream.setCharacterStream(new StringReader(txtXml)); 
           document2=documentBuilder2.parse(inStream);
           document=documentBuilder.parse(tempFileXML);
           document.getFirstChild().appendChild(document.importNode(document2.getDocumentElement(),true));
           writeXmlFile(document,tempFileXML);
            writeXmlFile I got from another forum posting
public static void writeXmlFile(Document doc, String filename) {
        try {
            // Prepare the DOM document for writing
            Source source = new DOMSource(doc);
            // Prepare the output file
            File file = new File(filename);
            Result result = new StreamResult(file);
            // Write the DOM document to the file
            Transformer xformer = TransformerFactory.newInstance().newTransformer();
            xformer.transform(source, result);
        } catch (TransformerConfigurationException e) {
        } catch (TransformerException e) {
    }