web development helpdesk

A Transformer can be used to write a the XML for a DOM Document to a file. As the name implies a Transformer transforms a Source object into a Result, in this case the Source is the DOM Document, and the Result is an XML file.

TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
Result result = new StreamResult(new File(xmlOutputFilePath));
Source source = new DOMSource(document);
transformer.transform(source, result);

written by objects \\ tags: Document, DOM, Transformer

To restrict the number of characters that the user can enter into a text field can be achieved by either using a JFormattedTextField or using a custom Document with any JTextComponent.

To implement this using a JFormattedTextFiled is simply a matter of specifying the appropriate MaskFormatter to meet your requiremenets.

JTextField field = new JFormattedTextField(new MaskFormatter("***"));


The following class gives an example of how a custom Document can be implemented for use in any text component.

public class FixedSizeDocument extends PlainDocument
{
   private int max = 10;

   public FixedSizeDocument(int max)
   {
        this.max = max;
   } 

   @Override
   public void insertString(int offs, String str, AttributeSet a)
      throws BadLocationException
   {
      // check string being inserted does not exceed max length

      if (getLength()+str.length()>max)
      {
         // If it does, then truncate it

         str = str.substring(0, max - getLength());
      }
      super.insertString(offs, str, a);
   }
}

You can then use this class with your JTextField for example using the following

field.setDocument(new FixedSizeDocument(5));


written by objects \\ tags: Document, JFormattedTextField, JTextComponent, JTextField, MaskFormatter, PlainDocument

DocumentBuilderFactory factory =
   DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(file);
// or if you need to specify an encoding explitily
// Document document = builder.parse(
//   new InputStreamReader(new FileInputStream(file), encoding)); 

written by objects \\ tags: Document, DOM, file, load