How to remove an Element from XML by confirming Attribute of that element

Question

Hi guys
I have an XML file where i have all users DB. Now i want to remove a user from that XML file. I want to check an user id attribute which is uniqe with existing users in XML file, if its the same user then delete this user from XML file and save the changes in XML file.
here is my XML file:
<?xml version="1.0" encoding="UTF-8"?>
<users>
<user id="zahid" password="X8UrUN79avT27LYwUESiliAV328=" name="Zahid Nawaz" phone="9599808" email="[email protected]" role="Tnr+vPuuAAsix8heVWD4mioCgLQ=" />
<user id="Admin" name="alpha beta" password="fEqNCco3Yq9h5ZUglD3CZJT4lBs=" phone="456782656" email="[email protected]" role="Tnr+vPuuAAsix8heVWD4mioCgLQ=" />
<user id="Guest" name="beta alpha" password="+ml3yZuAnbaOHFaIjsOL0ARxmzk=" phone="8765432" email="[email protected]" role="+s6D7jAUvcj5ggPMlOLokiJFLpA=" /><user id="Guest1" name="unknown unknown" password="+ml3yZuAnbaOHFaIjsOL0ARxmzk=" phone="123122112" email="[email protected]" role="+s6D7jAUvcj5ggPMlOLokiJFLpA=" />
</users>for example i want to delete a user which have user id= Guest.
How can i do it in Java. Any code example please. i am using JDOM document and SAXBuilder for parsing.
Waiting for your replay.
Thanks in Advance
Best regard

Answer 1

Hi,
Till now i tried the following code which give null pointer exception at following line
element.getParentNode().removeChild(element);
     public String removeUserByID(String id) throws Exception{
               DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
             DocumentBuilder builder = factory.newDocumentBuilder();
             TransformerFactory tFactory = TransformerFactory.newInstance();
             Transformer tFormer = tFactory.newTransformer();
               doc = builder.parse(usersXml);
             Element element = (Element)doc.getElementsByTagName("user id="+id).item(0);
//             Remove the node
             element.getParentNode().removeChild(element);
//             Normalize the DOM tree to combine all adjacent nodes
             doc.normalize();
             FileOutputStream fos = new FileOutputStream(this.usersXml);
               XMLOutputter out = new XMLOutputter();
               out.output(((org.jdom.Document)doc), fos);
          /*     Source source = new DOMSource(doc);
             Result dest = new StreamResult(System.out);
             tFormer.transform(source, dest);
             System.out.println();
             return "true";
          if following line i m trying to use first attribute of my XML file where i am passing a string which is for example like "user id=Guest". id is a string which have user Id "Guest".
Element element = (Element)doc.getElementsByTagName("user id="+id).item(0);So any suggestion??Whats wrong here?
Best regards and thanks again 4 ur reply.