Source Code : The program prints all hyperlinks links of an XHTML web page

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The program prints all hyperlinks links of an XHTML web page

  
/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

import java.io.InputStream;
import java.net.URL;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.helpers.DefaultHandler;

/**
 * This program demonstrates how to use a SAX parser. The program prints all hyperlinks links of an
 * XHTML web page. <br>
 * Usage: java SAXTest url
 * @version 1.00 2001-09-29
 * @author Cay Horstmann
 */
public class SAXTest
{
   public static void main(String[] args) throws Exception
   {
      String url;
      if (args.length == 0)
      {
         url = "http://www.w3c.org";
         System.out.println("Using " + url);
      }
      else url = args[0];

      DefaultHandler handler = new DefaultHandler()
         {
            public void startElement(String namespaceURI, String lname, String qname,
                  Attributes attrs)
            {
               if (lname.equals("a") && attrs != null)
               {
                  for (int i = 0; i < attrs.getLength(); i++)
                  {
                     String aname = attrs.getLocalName(i);
                     if (aname.equals("href")) System.out.println(attrs.getValue(i));
                  }
               }
            }
         };

      SAXParserFactory factory = SAXParserFactory.newInstance();
      factory.setNamespaceAware(true);
      SAXParser saxParser = factory.newSAXParser();
      InputStream in = new URL(url).openStream();
      saxParser.parse(in, handler);
   }
}

   
    
  

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