Improved RSSLister

Print only item titles:

import javax.xml.stream.*;
import java.net.*;
import java.io.*;

 
public class BetterRSSLister {

  public static void main(String[] args) {
        
    if (args.length == 0) {
      System.err.println("Usage: java BetterRSSLister url" );
      return;    
    }
        
    try {

      InputStream in;
      try {
        URL u = new URL(args[0]);
        in = u.openStream();
      }
      catch (MalformedURLException ex) {
          // Maybe it's a file name
          in = new FileInputStream(args[0]);
      }

      XMLInputFactory factory = XMLInputFactory.newInstance();
      XMLStreamReader parser = factory.createXMLStreamReader(in);
        
      boolean inItem = false;
      boolean inTitle = false;
      // I am relying on no recursion here. To fix this
      // just keep an int count rather than a boolean
      for (int event = parser.nextTag(); 
           parser.hasNext(); 
           event = parser.next()) {
         if (event == XMLStreamConstants.START_ELEMENT) {
             String name = parser.getLocalName();
             if (name.equals("title")) inTitle = true;
             else if (name.equals("item")) inItem = true;
         }
         else if (event == XMLStreamConstants.END_ELEMENT) {
             String name = parser.getLocalName();
             if (name.equals("title")) inTitle = false;
             else if (name.equals("item")) inItem = false;
          }
         else if (parser.hasText() && event != XMLStreamConstants.COMMENT) {
             if (inItem && inTitle) System.out.println(parser.getText());
         }
      }  
      parser.close();
      
    }
    catch (XMLStreamException ex) {
       System.out.println(ex);  
    }
    catch (IOException ex) {
      System.out.println("IOException while parsing " + args[0]);   
    }
        
  }

}

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Copyright 2000-2004 Elliotte Rusty Harold
elharo@metalab.unc.edu
Last Modified January 7, 2004