<forexml site="Austin">
<observation
    city="Austin, Texas"
    temp.F="75"
    rel_hum.percent="31"
    wind_speed.knt="8"
    skies="partly cloudy"
/>
<almanac
    sunrise="7:08 AM"
    sunset="6:21 PM"
/>
<forecast
    type="nearterm"
    source="NWS"
    day="THIS AFTERNOON"
    weather="SU"
    high_temp="77"
    text="HIGHS 75 TO 80. WEST 15 TO 20 MPH."
/>
</forexml>

// Given a list of arguments, parse a city
// name and a list of attributes to filter.
// Alternatively, accept "all" as an indication
// to get all attributes
public static void main( String [] args ) {
   if ( args.length == 0) {
     System.out.println
       ( "Usage: java Weather city"
           +" [all|attributes]" );
     System.out.println
       ( "Example:"
           +" java Weather Austin temp.F" );
     System.exit( 0 );
   }
   // Gather arguments
   String city = args[ 0 ];
   String [] attrNames = null;
   if ( args.length == 1) {
     attrNames = new String [] { "all" };
   } else {
     // args.length > 1
     attrNames =
       new String [ args.length - 1 ]; 
     for ( int i = 1; i < args.length; i++)
       attrNames[ i - 1 ] = args[ i ];
   } // if
	
   // Process document
   processDocument( city, observationTagName,
     attrNames );
} // main

// Given a city string, an element name, and
// a list of attributes, print the values of
// the attributes found in the XML document.
public static void processDocument(
   String city,
   String elementName, String [] attrNames ) {
   DocumentBuilderFactory dbf =
      DocumentBuilderFactory.newInstance ( ) ;
      
   try {
         DocumentBuilder db =
            dbf.newDocumentBuilder ( ) ;
            
         if ( city != null ) {
             String urlString =
                 weatherSite + city;
             Document document = getDocument
                ( db, urlString );
             if ( document != null ) {
                Node [] matchNodes =
                   getAttributes( document,
                      elementName, attrNames );
                 if (null != matchNodes ) {
                   if ( matchNodes.length > 6 )
                       printNodes( "City=" + city,
                         matchNodes, true );
                   else  
                       printNodes( "City=" + city,
                         matchNodes, false );
                 } else 
                     System.out.println (  
                        "Element \"" +
                        elementName +
                   "\" not found in document." );
         } else
             System.out.println 
                ( "No XML created from URL="
                   + urlString );
   } // if         
  } catch (  
      ParserConfigurationException e ) { 
      e.printStackTrace ( ) ; 
  }
} // processDocument

// Using the given document builder object,
// construct and return an XML DOM
// from the given URL.
public static Document getDocument
  ( DocumentBuilder db, String urlString ) {
   try {
     URL url = new URL( urlString );
     
     try {
       URLConnection URLconnection =
          url.openConnection ( ) ;
       HttpURLConnection httpConnection =
          (HttpURLConnection)
         URLconnection;
         
       int responseCode =
        httpConnection.getResponseCode ( ) ;
       if ( responseCode ==
        HttpURLConnection.HTTP_OK) {
           InputStream in =
            httpConnection.getInputStream ( ) ;
            
           try {
             Document doc = db.parse( in );
             return doc;
           } catch(
            org.xml.sax.SAXException e ) {
                e.printStackTrace ( ) ;
           }
        } else {
            System.out.println
               ( "HTTP connection response !=
               HTTP_OK" );
               
        } 
     } catch ( IOException e ) { 
          e.printStackTrace ( ) ;
     } // Catch
  } catch ( MalformedURLException e ) {  
      e.printStackTrace ( ) ;
  } // Catch
  return null;
} // getDocument

// Given an XML document,
// return the values of all attributes
// for the given element.
public static Node [] getAttributes
   ( Document document,
    String elementName, String [] attrNames ) {
    
    // Get elements with the given tag name
    // (matches on * too)
    NodeList nodes = document.getElementsByTagName
       ( elementName );
    if ( nodes.getLength() < 1) {
      return null;
    }
    
    Node firstElement = nodes.item( 0 );
    NamedNodeMap nnm =
       firstElement.getAttributes ( ) ;
   
    if (nnm != null) {
      // Test the value of each attribute
      Node [] matchNodes = new Node
         [ attrNames.length ];
        
       for (int i = 0; i < attrNames.length; i++){
          boolean all =
            attrNames[ i ].equalsIgnoreCase("all");
           if (all) {
             // named node map
             int nnmLength = nnm.getLength();
             matchNodes = new Node[ nnmLength ];
             
             for ( int j = 0; j < nnmLength; j++){
                matchNodes[ j ] = nnm.item( j );
             }
             return matchNodes;
           } else {
               matchNodes[ i ] = nnm.getNamedItem
                 ( attrNames[ i ] );
               if ( matchNodes[ i ] == null ) {
                 matchNodes[ i ] =
                     document.createAttribute
                     ( attrNames[ i ] );
                  ((Attr)matchNodes[ i ]).setValue
                    ( unknownAttribute );
               }
           } // if
      } // for
      
      return matchNodes;
   } // if
   
   return null;
} // printDocumentAttrs

// Given a set of nodes,
// print the values of the nodes.
// The nodes may be given a title.
// The nodes may be printed on one line
// (grouped) or many.
public static void printNodes
  ( String title, Node [] nodes,
       boolean grouped ) {
       
       // Report the name value of each node
       System.out.print( title );
       
       if (grouped){
          System.out.println ( ) ;
       }
       // Walk through the nodes.
       for ( int i = 0; i < nodes.length; i++ ) {
           Node node = nodes[ i ];
           System.out.print
              ( grouped ? " " : ", " );
           System.out.print
              ( node.getNodeName() + "=" +
              node.getNodeValue() );
              
            if ( grouped ) {
               System.out.println ( ) ;
            }  
    } // for
    
    if (!grouped) {
        System.out.println ( ) ;
    }  
} // printAttributeValues

City=Austin
   city=Austin, Texas
   latitude=30.30
   longitude=-97.70
   time=3 PM CDT ...
   temp.F=84
   temp.C=28
   rel_hum.percent=58
   wind.string=S at 11 knt
   skies=clear