Reading/Parsing an XML doc Question

[Russ Russell]

Hi,
I have the following class which successfully reads and parses an XML doc. The problem is, it only reads the first <item> in the list.

What do I need to do in order to loop through the doc so that I can read the first few (or all) of the items? Here is my code:

   
package com.russ.RSS;

import java.net.MalformedURLException;
import java.net.URL;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;
import org.jaxen.JaxenException;
import org.jaxen.XPath;
import org.jaxen.dom4j.Dom4jXPath;


public class RSS {
	
	String itemTitle;
	String itemPubdate;
	String itemLink;
	String itemDescription;
	String returnString[];
	
	//CONSTRUCTOR
	public RSS(){
		
	}

	public String[] getHeadline() {
		returnString = new String[3];
		SAXReader reader = new SAXReader();
		
		Document document;
		try {
			document = reader.read(new URL(
					"http://api.search.yahoo.com/WebSearchService/rss/webSearch.xml?appid=yahoosearchwebrss&query=school+district+budget+short&adult_ok=1"));
			
			XPath expression = new Dom4jXPath("/rss/channel");

			Node result = (Node) expression.selectSingleNode(document);

			itemTitle = result.valueOf("//item//title");
			itemPubdate = result.valueOf("//item//pubDate");
			itemLink = result.valueOf("//item//link");
			itemDescription = result.valueOf("//item//description");


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

		} catch (DocumentException e) {
			e.printStackTrace();
		} catch (JaxenException e) {
			e.printStackTrace();
		}
		
		returnString[0]=itemTitle;
		returnString[1]=itemDescription;
		returnString[2]=itemLink;
		
		return returnString;
	}

}

[Rob Spoor]

How about calling selectNodes instead of selectSingleNode? Because the latter selects only a single node -- hence the name.

[Russ Russell]

Thanks! And then how do I loop through the items now that I amselecting multiple nodes?

Thanks again.

[Rob Spoor]

selectNodes returns a java.util.List; I'm sure I don't need to tell you how to iterate over a List. Because the List isn't generic the only thing you'll need to do is cast the elements to Node; but you need to do that for selectSingleNode too.

[Russ Russell]

Thanks for the help so far.

I am VERY new to XML (and sort of new to Java).

It seems I am still only getting the first item. Does this look right?

 
List results = expression.selectNodes(document);
Iterator iterator = results.iterator();
Navigator navigator = expression.getNavigator();

while (iterator.hasNext()) {
   Node result = (Node) iterator.next();
   String value = StringFunction.evaluate(result, navigator);
   //This prints the entire document: 
   System.out.println(value);
   //This prints only the fist element of <item><description> 
   System.out.println(result.valueOf("//item//description"));
 }
   

I would like to print all the <item><description> elements in the entire document.

Thank you,
-Russ