Read xml file placed on localhost

[maja neskovic]

Hello!

I wanted like to read xml file and I did it like this:

 package impl;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import java.io.File;

import javax.swing.JApplet;

public class readxml extends JApplet {

    public void init() {
    try {

        File fXmlFile = new File("book.xml");
        DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
        Document doc = dBuilder.parse(fXmlFile);
        doc.getDocumentElement().normalize();

        System.out.println("Root element :" + doc.getDocumentElement().getNodeName());
        NodeList nList = doc.getElementsByTagName("test_applet");
        System.out.println("-----------------------");

        for (int temp = 0; temp < nList.getLength(); temp++) {

           Node nNode = nList.item(temp);
           if (nNode.getNodeType() == Node.ELEMENT_NODE) {

              Element eElement = (Element) nNode;

              System.out.println("Vrednost promenljive: "  + getTagValue("confirm_button_set_text",eElement));

            }
        }
  } catch (Exception e) {
        e.printStackTrace();
  }
 }

 private static String getTagValue(String sTag, Element eElement){
    NodeList nlList= eElement.getElementsByTagName(sTag).item(0).getChildNodes();
    Node nValue = (Node) nlList.item(0);

    return nValue.getNodeValue();
 }
}  

But I have problem with path to my xml file. I would like to put it on my localhost in this line

          File fXmlFile = new File("book.xml");  

so the path would be http://localhost/book.xml. I put that path in applet, but it doesn't work. I reports error, because it searches for file on this path: C:\Documents and Settings\maja.neskovic\My Documents\Princip rada steka\Stek\http:\localhost\book.xml. I am not sure where it finds this path and I hope somebody can help me to fix this path problem.

[Lester Burnham]

So the XML file is on the server? Then you can't use java.io.File to get at it. You can obtain an InputStream that you can pass to dBuilder like this:

URL textURL = new URL( getCodeBase() , "book.xml" );
InputStream is = textURL.openStream()

This assumes that the XML file is in the same directory as the applet.

[Rob Spoor]

You can't work with files when working with applets. You must use URLs instead. Applet (and therefore also JApplet) has a method called getDocumentBase(). This returns a URL to the HTML file in which the applet is embedded. You can then create a relative URL to the XML file:

URL base = getDocumentBase();
URL xml = new URL(base, "book.xml");

Parsing doesn't change much:

Document doc = null;
InputStream is = xml.openStream();
try
{
    doc = dBuilder.parse(is);
}
finally
{
    is.close();
}

Another option is to put the XML file in your JAR file and treat it as a resource. Check out Class.getResourceAsStream for more information.

Edit: beaten by Lester

Oh, and I'll move this to our Applet forum since it has nothing to do with Swing.

[maja neskovic]

I have solved the problem like you said, Rob.

Thank you both a lot

Greetings!