Appending string to the start of a file problem

Hi guys,
I've got an xml file which i want to add a dtd to. So i'm using RandomAccessFile to seek the start of the file and write to it, but its seems to be overwriting a small part of my file. My code to this is below:
         try {
         RandomAccessFile f = new RandomAccessFile(xmlMap,"rw");
            f.seek(0);
        //write DTD definition to start of file
         f.writeChars("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"+"\n"+
                 "<!DOCTYPE map SYSTEM \"mapDTD.dtd\">"+"\n");
         f.close();
         } catch(IOException e) {
              System.out.println("ERROR with file name, game exiting");
              System.exit(1);
         }If i take in this xml file:
<map width="19" height="19" goal="6" name="Hallways of Dooom">
     <random-item type='lantern' amount='5' />
     <random-item type='health' amount='10' />
     <tile x="0" y="0" type="floor" />
     <tile x="1" y="0" type="floor">
          <renderhint>floor:wood</renderhint>
     </tile>
     <tile x="2" y="0" type="floor" />
     <tile x="3" y="0" type="wall" />
     <tile x="4" y="0" type="wall" />
     <tile x="5" y="0" type="wall">
          <renderhint>wall:bricks,cracked</renderhint>
     </tile>it gets overwritten as :
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE map SYSTEM "mapDTD.dtd">
     <tile x="0" y="0" type="floor" />
     <tile x="1" y="0" type="floor">
          <renderhint>floor:wood</renderhint>
     </tile>
     <tile x="2" y="0" type="floor" />
     <tile x="3" y="0" type="wall" />
     <tile x="4" y="0" type="wall" />
     <tile x="5" y="0" type="wall">
          <renderhint>wall:bricks,cracked</renderhint>
     </tile>I want it so it is :
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE map SYSTEM "mapDTD.dtd">
<map width="19" height="19" goal="6" name="Hallways of Dooom">
     <random-item type='lantern' amount='5' />
     <random-item type='health' amount='10' />
     <tile x="0" y="0" type="floor" />
     <tile x="1" y="0" type="floor">
          <renderhint>floor:wood</renderhint>
     </tile>
     <tile x="2" y="0" type="floor" />
     <tile x="3" y="0" type="wall" />
     <tile x="4" y="0" type="wall" />
     <tile x="5" y="0" type="wall">
          <renderhint>wall:bricks,cracked</renderhint>
     </tile>
     <tile x="6" y="0" type="wall" />
     <tile x="7" y="0" type="wall" />
     <tile x="8" y="0" type="wall">
          <renderhint>wall:rock,cracked</renderhint>
     </tile>If anyone can see what's going wrong and how i can correct, i would greatly appreciate them saying so.
Thanks a lot.

javaUser wrote:
Hi guys,
I've got an xml file which i want to add a dtd to. So i'm using RandomAccessFile ...That's your mistake. Don't use random access file. It wasn't built for this situation and shouldn't be used for this situation. Do the right thing: rewrite the whole file.

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               System.out.println("Failed at WinXP Copy 1");
               e.printStackTrace();
          } //Moves Jar File to Application Folder
          try {
               copy(name, dir2);
          } catch (IOException e) {
               errorWin=new JFrame("Failed at WinXp Copy 2");
               errorWin.setVisible(true);
               errorWin.repaint();
               System.out.println("Failed at WinXP Copy 2");
               e.printStackTrace();
          } //Moves Jar File to Application Folder
     public void copy(String fromFileName, String toFileName) throws IOException {
       File fromFile = new File(fromFileName);
       File toFile = new File(toFileName);
       if (!fromFile.exists()){
            errorWin=new JFrame("FileCopy: " + "no such source file: " + fromFileName);
               errorWin.setVisible(true);
               errorWin.repaint();
         throw new IOException("FileCopy: " + "no such source file: " + fromFileName);
       if (!fromFile.isFile()){
            errorWin=new JFrame("FileCopy: " + "can't copy directory: "
                       + fromFileName);
               errorWin.setVisible(true);
               errorWin.repaint();
         throw new IOException("FileCopy: " + "can't copy directory: "
             + fromFileName);
       if (!fromFile.canRead()){
            errorWin=new JFrame("FileCopy: " + "source file is unreadable: "
                       + fromFileName);
               errorWin.setVisible(true);
               errorWin.repaint();
         throw new IOException("FileCopy: " + "source file is unreadable: "
             + fromFileName);
       if (toFile.isDirectory())
         toFile = new File(toFile, fromFile.getName());
       if (toFile.exists()) {
         if (!toFile.canWrite()){
              errorWin=new JFrame("FileCopy: destination file is unwriteable: " + toFileName);
               errorWin.setVisible(true);
               errorWin.repaint();
           throw new IOException("FileCopy: destination file is unwriteable: " + toFileName);
         System.out.print("Overwrite existing file " + toFile.getName()
             + "? (Y/N): ");
         System.out.flush();
         BufferedReader in = new BufferedReader(new InputStreamReader(
             System.in));
         String response = in.readLine();
         if (!response.equals("Y") && !response.equals("y")){
              errorWin=new JFrame("FileCopy: existing file was not overwritten.");
               errorWin.setVisible(true);
               errorWin.repaint();
              throw new IOException("FileCopy: existing file was not overwritten.");
       } else {
         String parent = toFile.getParent();
         if (parent == null)
           parent = System.getProperty("user.dir");
         File dir = new File(parent);
         if (!dir.exists()){
              errorWin=new JFrame("FileCopy: destination directory doesn't exist: " + parent);
               errorWin.setVisible(true);
               errorWin.repaint();
           throw new IOException("FileCopy: destination directory doesn't exist: " + parent);
         if (dir.isFile()){
              errorWin=new JFrame("FileCopy: destination is not a directory: " + parent);
               errorWin.setVisible(true);
               errorWin.repaint();
           throw new IOException("FileCopy: destination is not a directory: " + parent);
         if (!dir.canWrite()){
              errorWin=new JFrame("FileCopy: destination directory is unwriteable: " + parent);
               errorWin.setVisible(true);
               errorWin.repaint();
           throw new IOException("FileCopy: destination directory is unwriteable: " + parent);
       FileInputStream from = null;
       FileOutputStream to = null;
       try {
         from = new FileInputStream(fromFile);
         to = new FileOutputStream(toFile);
         byte[] buffer = new byte[4096];
         int bytesRead;
         while ((bytesRead = from.read(buffer)) != -1)
           to.write(buffer, 0, bytesRead); // write
       } finally {
         if (from != null)
           try {
             from.close();
           } catch (IOException e) {
         if (to != null)
           try {
             to.close();
           } catch (IOException e) {
}

That's clearly a security restriction then. You need to assign the JVM's user account enough rights to do so, or to configure any firewall/virusscanner which has possibly blocked it.
Apart from this, are you aware of the fact that the OS root disk is not per se labeled "C:", that the location of documents is not per se "Documents and Settings", that there exist System#getenv() and System#getProperty() methods to find default system and environment variables and that there is the java.util.prefs API to access the registry? Your application is likely not going to run on any environment.

Appending string to the start of a file problem

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