HtmlParseDemo.java

import java.io.*;  import java.net.*;  import javax.swing.text.*;  import javax.swing.text.html.*;  import javax.swing.text.html.parser.*;    /**   * This small demo program shows how to use the   * HTMLEditorKit.Parser and its implementing class   * ParserDelegator in the Swing system.   */    public class HtmlParseDemo {      public static void main(String [] args) {          Reader r;          if (args.length == 0) {              System.err.println("Usage: java HTMLParseDemo [url | file]");              System.exit(0);          }          String spec = args[0];          try {              if (spec.indexOf("://") > 0) {                  URL u = new URL(spec);                  Object content = u.getContent();                  if (content instanceof InputStream) {                      r = new InputStreamReader((InputStream)content);                  }                  else if (content instanceof Reader) {                      r = (Reader)content;                  }                  else {                      throw new Exception("Bad URL content type.");                  }              }              else {                  r = new FileReader(spec);              }                HTMLEditorKit.Parser parser;              System.out.println("About to parse " + spec);              parser = new ParserDelegator();              parser.parse(r, new HTMLParseLister(), true);              r.close();          }          catch (Exception e) {              System.err.println("Error: " + e);              e.printStackTrace(System.err);          }      }  }

HTMLParseLister.java

/**   * HTML parsing proceeds by calling a callback for   * each and every piece of the HTML do*****ent.  This   * simple callback class simply prints an indented   * structural listing of the HTML data.   */  class HTMLParseLister extends HTMLEditorKit.ParserCallback  {      int indentSize = 0;        protected void indent() {          indentSize += 3;      }      protected void unIndent() {          indentSize -= 3; if (indentSize < 0) indentSize = 0;      }        protected void pIndent() {          for(int i = 0; i < indentSize; i++) System.out.print(" ");      }        public void handleText(char[] data, int pos) {          pIndent();          System.out.println("Text(" + data.length + " chars)");      }        public void handleComment(char[] data, int pos) {          pIndent();          System.out.println("Comment(" + data.length + " chars)");      }        public void handleStartTag(HTML.Tag t, MutableAttributeSet a, int pos) {          pIndent();          System.out.println("Tag start(<" + t.toString() + ">, " +                             a.getAttributeCount() + " attrs)");          indent();      }        public void handleEndTag(HTML.Tag t, int pos) {          unIndent();          pIndent();          System.out.println("Tag end(</" + t.toString() + ">)");      }        public void handleSimpleTag(HTML.Tag t, MutableAttributeSet a, int pos) {          pIndent();          System.out.println("Tag(<" + t.toString() + ">, " +                             a.getAttributeCount() + " attrs)");      }        public void handleError(String errorMsg, int pos){          System.out.println("Parsing error: " + errorMsg + " at " + pos);      }  }