How to delete and edit data from an XML file by use of JSP?

[Gurpreet Singhh]

I want to know how to delete and edit data from an XML file by use of JSP. I have XML file having tasks(root node),task id,project,date(as child nodes). I have many tasks stored in the xml file,I want to delete and edit some tasks using task id then how can i do it in JSP.Please help with example if any.Thank you XML file : tasks.XML::

<?xml version = '1.0' encoding = 'UTF-8'?>
<Tasks>
   <task>
      <Taskid>1</Taskid>
      <Taskname>Coding</Taskname>
      <Project>CeMIC</Project>
      <Date>21 February</Date>
   </task>
   <task>
      <Taskid>2</Taskid>
      <Taskname>Testing</Taskname>
      <Project>Blackberry</Project>
      <Date>2 march</Date>
   </task>
   <task>   
      <Taskid>3</Taskid>
      <Taskname>Integration</Taskname>
      <Project>Assinment JSP</Project>
      <Date>23 march</Date>
   </task>
   <task>
      <Taskid>4</Taskid>
      <Taskname>Implementation</Taskname>
      <Project>CMIC</Project>
      <Date>7 april</Date>
   </task>
   <task>
      <Taskid>5</Taskid>
      <Taskname>Maintainance</Taskname>
      <Project>CMIC</Project>
      <Date>7 april</Date>
   </task>
</Tasks>
 

I have a java program to remove element but i want to know how to remove by providing element attribute (like task id) and deleting all data IN JSP?
RemoveElement.java: I want it in jsp

import java.io.*;
import org.w3c.dom.*;
import org.xml.sax.*;
import javax.xml.parsers.*;
import javax.xml.transform.*; 
import javax.xml.transform.dom.DOMSource; 
import javax.xml.transform.stream.StreamResult;
 
public class RemoveElement {
  static public void main(String[] arg) {
    try{
      BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
      System.out.print("Enter a XML file name: ");
      String xmlFile = bf.readLine();
      File file = new File(xmlFile);
      System.out.print("Enter an element which have to delete: ");
      String remElement = bf.readLine();
      if (file.exists()){
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document doc = builder.parse(xmlFile);
        TransformerFactory tFactory = TransformerFactory.newInstance();
        Transformer tFormer = tFactory.newTransformer();
        Element element = (Element)doc.getElementsByTagName(remElement).item(0);
//        Remove the node
        element.getParentNode().removeChild(element);
//              Normalize the DOM tree to combine all adjacent nodes
        doc.normalize();
        Source source = new DOMSource(doc);
        Result dest = new StreamResult(System.out);
        tFormer.transform(source, dest);
        System.out.println();
      }
      else{
        System.out.println("File not found!");
      }
    }
    catch (Exception e){
      System.err.println(e);
      System.exit(0);
    }
  }
 

[Dheeraj Joshi]

May i know why you want to do it in JSP?

Regards
Dheeraj Joshi

[Gurpreet Singhh]

because I want to implement it on web,I am learning JSP as web technologies and I have an assignment to complete in which i need to delete and edit XML data using JSP

[Arunkrishna]

i think this will help u

import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.*;
 
public class AccessingXmlFile {
 
 public static void main(String argv[]) {
 
  try {
  File file = new File("C:\\MyFile.xml");
  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  DocumentBuilder db = dbf.newDocumentBuilder();
  Document document = db.parse(file);
  document.getDocumentElement().normalize();
  System.out.println("Root element "+document.getDocumentElement().getNodeName());
  NodeList node = document.getElementsByTagName("student");
  System.out.println("Information of the students");
 
  for (int i = 0; i < node.getLength(); i++) {
  Node firstNode = node.item(i);
 
  if (firstNode.getNodeType() == Node.ELEMENT_NODE) {
 
  Element element = (Element) firstNode;
  NodeList firstNameElemntList = element.getElementsByTagName("firstname");
  Element firstNameElement = (Element) firstNameElemntList.item(0);
  NodeList firstName = firstNameElement.getChildNodes();
  System.out.println("First Name:"+ ((Node)firstName.item(0).getNodeValue());
 
  NodeList lastNameElementList = element.getElementsByTagName("lastname");
  Element lastNameElement = (Element) lastNameElementList.item(0);
  NodeList lastName = lastNameElement.getChildNodes();
  System.out.println("Last Name :"+((Node)lastName.item(0).getNodeValue());
 
  NodeList addressList = element.getElementsByTagName("address");
  Element addressElement = (Element) addressList.item(0);
  NodeList address = addressElement.getChildNodes();
  System.out.println("Address : "  + ((Node) address.item(0)).getNodeValue());
 
  NodeList cityList = element.getElementsByTagName("city");
  Element cityElement = (Element) cityList.item(0);
  NodeList city = cityElement.getChildNodes();
  System.out.println("City : "  + ((Node) city.item(0)).getNodeValue());
 }
}
  } catch (Exception e) {
    e.printStackTrace();
  }
 }
}

[Gurpreet Singhh]

Thanks for the reply
Sir your program is giving the errors
")" in line 29
after i removed that error its giving another errornamed as : line 31 & 36 : inconvertible types
Please check it again and remove errors and reply back
Thank you