get xml data from url

[jforce93]

I am trying to get xml data from a url. When I use this to parse the xml from a file, it works perfectly. but when I replace thing.xml with a url, it doesn't work. here is the code:




import java.io.File;
import org.w3c.dom.Document;
import org.w3c.dom.*;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

public class XMLReader{

public static void main (String argv []){
try {

DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();

Document doc = docBuilder.parse (new File("thing.xml"));

// normalize text representation
doc.getDocumentElement ().normalize ();
System.out.println ("Root element of the doc is " +
doc.getDocumentElement().getNodeName());


NodeList listOfPersons = doc.getElementsByTagName("person");
int totalPersons = listOfPersons.getLength();
System.out.println("Total no of people : " + totalPersons);

for(int s=0; s<listOfPersons.getLength() ; s++){


Node firstPersonNode = listOfPersons.item(s);
if(firstPersonNode.getNodeType() == Node.ELEMENT_NODE){


Element firstPersonElement = (Element)firstPersonNode;

//-------
NodeList firstNameList = firstPersonElement.getElementsByTagName("first");
Element firstNameElement = (Element)firstNameList.item(0);

NodeList textFNList = firstNameElement.getChildNodes();
System.out.println("First Name : " +
((Node)textFNList.item(0)).getNodeValue().trim());

//-------
NodeList lastNameList = firstPersonElement.getElementsByTagName("last");
Element lastNameElement = (Element)lastNameList.item(0);

NodeList textLNList = lastNameElement.getChildNodes();
System.out.println("Last Name : " +
((Node)textLNList.item(0)).getNodeValue().trim());

//----
NodeList ageList = firstPersonElement.getElementsByTagName("age");
Element ageElement = (Element)ageList.item(0);

NodeList textAgeList = ageElement.getChildNodes();
System.out.println("Age : " +
((Node)textAgeList.item(0)).getNodeValue().trim()) ;

//------


}//end of if clause


}//end of for loop with s var


}catch (SAXParseException err) {
System.out.println ("** Parsing error" + ", line "
+ err.getLineNumber () + ", uri " + err.getSystemId ());
System.out.println(" " + err.getMessage ());

}catch (SAXException e) {
Exception x = e.getException ();
((x == null) ? e : x).printStackTrace ();

}catch (Throwable t) {
t.printStackTrace ();
}
//System.exit (0);

}//end of main


}




when I use a url i get this error:


java.io.FileNotFoundException: /Users/jforce/http:/developerlife.com/xmljavatutorial1/AddressBook.xml (No such file or directory)

[travishein]

how about separating the url and the file from the document, such as using a function to read a document from an input stream.

/**
* Constructs a Document object by reading from an input stream.
*/
    public static Document parse (InputStream is) {
        Document ret = null;
        DocumentBuilderFactory domFactory;
        DocumentBuilder builder;

        try {
            domFactory = DocumentBuilderFactory.newInstance();
            domFactory.setValidating(false);
            domFactory.setNamespaceAware(false);
            builder = domFactory.newDocumentBuilder();

            ret = builder.parse(is);
        }
        catch (Exception ex) {
            System.error.println("unable to load XML: " + ex);
        }
        return ret;
    }

so, to read from a file,

InputStream in = new FileInputStream(new File("myfile.xml"));
Document doc = parse(in);

and, to read from a url

URL xmlUrl = new URL("file:///home/me/myfile.xml");
InputStream in = xmlUrl.openStream();
Document doc = parse(in);

[jforce93]

thanks man, that clears a lot of confusion up