Is it possible to update inside of an already existing .xml file?

I have a problem where I had to write an implementation of stack and make it read files and find errors inside the files. The only problem I am having is being able to then go into the file and fix the problem. Any chance anyone could help me out?
Thanks

allieyooo wrote:
That would be great if my professor did not care about performance but that is half of our grade.So write something; test it for correctness; and then performance test it (and document the results)... If it's not upto scratch then think about "How can I speed this up".
Performance still isn't a primary design motivation.
I'll bet that "half the marks" are primarily aimed at adequately metricating (and documenting) performance (which can be very tricky)... and secondarily; introducing you profiling your application and redesigning & tweaking to achieve the required performance.
What performance requirements have you got? And how big (in bytes) is the data-file? Any statement of acceptable test-beds?. Any stated limitations on the design you can use to achieve it? Resource limitations? You know; that sort of stuff.
Can you post a more complete description of the assignment... or better a URL I can download the assignment package from. It sounds like an interesting exercise.
Cheers. Keith.
Edited by: corlettk on 23/04/2009 15:23 ~~ Ooops!

Similar Messages

How to update Elements value inside existing xml file

Hi Gurus,
Am somehow new to java and working on xml with java, i have a scenario where i want to update the elements of my existing xml file, i know its possible as i have posted one code on this forum which updates the values of the arrtibutes of existing xml file. Ref :
http://forum.java.sun.com/thread.jsp?forum=34&thread=186091&start=15&range=15&hilite=false&q=
But am not able to use the same code to update the vlaues of the attribute.
if i have this xml file :
<?xml version="1.0"?>
<RootElement>
<Transaction>
<Task9>
<TaskID>Task9</TaskID>
<Description>My Test Case</Description>
<Time>12/12/2004</Time>
</Task9>
</Transaction>
<Transaction>
<Task2>
<TaskID>Task2</TaskID>
<Description>Testing my xml</Description>
<Time>12/12/2004</Time>
</Task2>
</Transaction>
</RootElemen>
Now i want to update teh </Description> and </Time> field using the code that i have given above in the link.
If any one can help me ill really appreciate.

The value of an element is stored in a child node of that element. For example, let's say that "e" references the node <Description> then:
e.getFirstChild().getNodeValue() => "My Test Case"

How do i update an existing XML File?

Hello, I have the following xml file gps.xml:<?xml version="1.0"?>
<!DOCTYPE gps SYSTEM "gps.dtd">
<gps>
 <latitude>43.00000</latitude>
 <longitude>-83.00000</longitude>
</gps> I already have methods written to get the values. But how can I change these values and update the file to reflect these changes?
thanks for your help!

Hi, I already have this following code. I would just like to add a method to it to update the existing XML file with different lat/lon coordinates. Could you please help me out with it? thanks
import java.io.*;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.*;
public class Gps implements java.io.Serializable {
 private double latitude_;
 private double longitude_;
 public Gps(Document doc) {
 setup(doc.getDocumentElement());
 public Gps(String uri) throws IOException, SAXException, ParserConfigurationException {
 setup(uri);
 public void setup(Document doc) {
 setup(doc.getDocumentElement());
 public void makeElement(Node parent) {
 Document doc;
 if (parent instanceof Document) {
 doc = (Document)parent;
 } else {
 doc = parent.getOwnerDocument();
 Element element = doc.createElement("gps");
 int size;
 URelaxer.setElementPropertyByDouble(element, "latitude", this.latitude_);
 URelaxer.setElementPropertyByDouble(element, "longitude", this.longitude_);
 parent.appendChild(element);
 public Document makeDocument() throws ParserConfigurationException {
 Document doc = UJAXP.makeDocument();
 makeElement(doc);
 return (doc);
 public final double getLatitude() {
 return (latitude_);
 public final void setLatitude(double latitude) {
 this.latitude_ = latitude;
 public final double getLongitude() {
 return (longitude_);
 public final void setLongitude(double longitude) {
 this.longitude_ = longitude;
 public final void updateXmlFile(double latitude, double longitude) {
 // something???
 public final void updateXmlFile(double latitude, double longitude) {
 this.latitude_ = latitude;
 this.longitude_ = longitude;
 public String makeTextDocument() {
 StringBuffer buffer = new StringBuffer();
 makeTextElement(buffer);
 return (new String(buffer));
 public void makeTextElement(StringBuffer buffer) {
 int size;
 buffer.append("<gps");
 buffer.append(">");
 buffer.append("<latitude>");
 buffer.append(Double.toString(getLatitude()));
 buffer.append("</latitude>");
 buffer.append("<longitude>");
 buffer.append(Double.toString(getLongitude()));
 buffer.append("</longitude>");
 buffer.append("</gps>");
 public String toString() {
 try {
 return (makeTextDocument());
 } catch (Exception e) {
 return (super.toString());
}

Updating an existing xml file using java code

hi friends,
I have simple problem, I have an existing xml file and I want to update some of the values in the file.
can any one send me the java code for that.
bye.
-harish

org.w3c.dom.Document d = parseXmlFile("D:/www/Detailcache/detail.xml", false);
public static Document parseXmlFile(String filename, boolean validating) {
try {
// Create a builder factory
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setValidating(validating);
// Create the builder and parse the file
Document doc = factory.newDocumentBuilder().parse(new File(filename));
return doc;
} catch (Exception e) {
System.out.println("ERROR-->");e.printStackTrace();
return null;
look at .. for more related examples
http://javaalmanac.com/egs/javax.xml.parsers/BasicDom.html?l=rel

Updating an existing xml file in java

Hi,
i need to update an existing xml file with new nodes. But i don.t know how to do that. i can read and write a new xml file . But updaton seems too difficult for me.
my xml structure is like this
<main_node>
<node1>
<name> name1</name1>
<id>ID</id>
</node1>
<node2>
<name2> name2</name2.
<id>ID</id>
</node2.
</main_node>
i want to insert node3 in this structure.
please help, it,s urgent;
Thanks in Advance

here is the code if ur using dom..
Node node4 = doc.createTextNode(name3);
Element element4=doc.createElement("name3");
element4.append(node4);
c one thing that u should take care here is that u have created and is reflected on ly in ur document object and not in xml..for that u have to write some more code like this
// This method writes a DOM document to a file
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) {
look this code..that will help u
regards
[email protected]

How to Update existing XML File Using Java Swing

Hi,
I am reading XML file and getting keywords into JList. When i add some keywords into JList through textfield and remove keywords JList, then after click on save button it should update xml file. How can i do it ?
Please provide me some code tips for updating xml file
This is the code that i am using for reading XML File:
import javax.swing.*;
import java.awt.event.*;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import java.io.IOException;
import java.util.*;
import java.text.Collator;
import java.util.regex.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import com.cloudgarden.layout.AnchorConstraint;
import com.cloudgarden.layout.AnchorLayout;
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static JPanel p;
static JLabel lbl;
static JButton btnSave,btnAdd,btnRemove;
static String path;
static Vector v;
static JList lstCur;
static JTextField txtKey;
Document dom;
static image imgval;
NodeList nodelstImage;
static AnchorLayout anchorLay;
private DefaultListModel lstCurModel;
public getKeywords()
 super("Current Keywords");
 v=new Vector();
 p=new JPanel();
 txtKey=new JTextField(10);
 btnAdd=new JButton("Add");
 btnRemove=new JButton("Remove");
 btnSave=new JButton("Save");
 lbl=new JLabel("Current Keywords");
 lstCurModel=new DefaultListModel();
 lstCur=new JList();
 JScrollPane scr=new JScrollPane(lstCur);
 runExample();
 lstCur.setModel(lstCurModel);
 p.add(lbl);
 p.add(scr);
 p.add(txtKey);
 p.add(btnAdd);
 p.add(btnRemove);
 p.add(btnSave);
 add(p);
 btnAdd.addActionListener(this);
 btnRemove.addActionListener(this);
 btnSave.addActionListener(this);
 setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
public static void main(String arg[])
 getKeywords g=new getKeywords();
 g.resize(250,400);
 g.setVisible(true);
public void actionPerformed(ActionEvent ae)
 if(ae.getSource()==btnAdd)
 lstCurModel.addElement(txtKey.getText());
 if(ae.getSource()==btnRemove)
 lstCurModel.remove(lstCur.getSelectedIndex());
 if(ae.getSource()==btnSave)
 //Code to Write
 public void runExample()
 //Parse the XML file and get the DOM object
 ParseXMLFile();
 //Get the Detail of the Image Document
 parseImageDocument();
 //Get the Detail of the LML Document
 //parseLMLDocument();
 //System.out.println(lmlval.Title);
 public void ParseXMLFile()
 //Get the Factory
 DocumentBuilderFactory builderFac = DocumentBuilderFactory.newInstance();
 try
 //Using factory get an instance of the Document Builder
 DocumentBuilder builder = builderFac.newDocumentBuilder();
 //parse using builder to get DOM representation of the XML file
 dom = builder.parse("LML.xml");
 catch(ParserConfigurationException pce)
 pce.printStackTrace();
 catch(SAXException sax)
 sax.printStackTrace();
 catch(IOException ioex)
 ioex.printStackTrace();
 public void parseImageDocument()
 //Get the root element
 Element docImgEle = dom.getDocumentElement();
 //Get a nodelist for <Image> Element
 nodelstImage = docImgEle.getElementsByTagName("Image");
 if(nodelstImage != null && nodelstImage.getLength() > 0)
 for(int i = 0; i < nodelstImage.getLength(); i++)
 //Get the LML elements
 Element el = (Element)nodelstImage.item(i);
 //Get the LML object
 getImage myImgval = new getImage();
 imgval = myImgval.getimage(el);
 v.addElement(new String(imgval.Thumb));
 String[] x = Pattern.compile(",").split(imgval.Keys);
 for (int s=0; s<x.length; s++)
 lstCurModel.addElement(x[s].trim());
 //System.out.println(x[s].trim());
} Thanks
Nitin

You should update your DOM document to represent the changes that you want made.
Then, using the Transformation API you simply transform your document onto a stream representing your file. Something like this:
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
// TODO - set indentation amount!
Source source = new DOMSource(dom);
Result result = new StreamResult(file);
transformer.transform(source, result);Hope this helps.

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flash display reflect data in a server-based XML-file. So far this
is easy. But I want the display to change everytime the XML file
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XMLConnector and specified it and the trigger in the first frame.
The Flash code catches and shows the XML values initially . But
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I DID find a solution with setInterval, but there is still a
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Hi,
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<?xml version="1.0" encoding="UTF-8"?>
<types>
<type super = "City">
<t>Faro</t>
<t>Porto</t>
<t>Helsinki</t>
</type>
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<?xml version="1.0" encoding="UTF-8"?>
<types>
<type super = "City">
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<t>Porto</t>
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hey mate, i remember when i had a similar issue before. I ended up using parsing the document using DOM instead of SAX. The reason being that i wanted to update the XML file and if i parsed the document using DOM i had a handle on the document object so i could subsequently update it. But the drawback is that the entire xml structure is parsed into memory, as opposed to SAX which im sure you know is event driven and memory friendly. I would use SAX for the simple process of parsing the xml file to either examine, or print out the content or both.Perhaps consider DOM?

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Is it possible to update inside of an already existing .xml file?

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