saxtest.java

java小程序

import java.io.*;
import java.net.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;

/**
   This program demonstrates how to use a SAX parser. The
   program prints all hyperlinks links of an XHTML web page.
   Usage: java SAXTest url
*/
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.equalsIgnoreCase("a") && attrs != null) 
               {
                  for (int i = 0; i < attrs.getLength(); i++) 
                  {
                     String aname = attrs.getLocalName(i);
                     if (aname.equalsIgnoreCase("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);     
   }
}