thumbelinaframe.java

html 解析处理代码

     * Based on the action of the event, executes the necessary subroutine.
     * @param actionEvent The event describing the user action.
     */
    public void actionPerformed (final ActionEvent actionEvent)
    {
        String action;

        action = actionEvent.getActionCommand ();
        if (action.equals ("Open"))
            open ();
        else if (action.equals ("Google"))
            googlesearch ();
        else if (action.equals ("Reset"))
            getThumbelina ().reset ();
        else if (action.equals ("Clear"))
            getThumbelina ().getPicturePanel ().reset ();
        else if (action.equals ("About"))
            about ();
        else if (action.equals ("Exit"))
            exit ();
        else
        {
            // must be a URL from the most recently used list
            getThumbelina ().open (action);
            updateMRU (action);
            updateMenu ();
        }
    }

    //
    // ItemListener interface
    //

    /**
     * Handles selections on the view state checkboxes.
     * @param event The event describing the checkbox affected.
     */
    public void itemStateChanged (final ItemEvent event)
    {
        Object source;
        boolean visible;

        source = event.getItemSelectable ();
        visible = ItemEvent.SELECTED == event.getStateChange ();
        if (source == mStatusVisible)
            getThumbelina ().setStatusBarVisible (visible);
        else if (source == mHistoryVisible)
            getThumbelina ().setHistoryListVisible (visible);
    }

    //
    // PropertyChangeListener
    //

    /**
     * Handle a property change.
     * @param event The property old and new values.
     */
    public void propertyChange (final PropertyChangeEvent event)
    {
        String url;

        if (event.getPropertyName ().equals (
            Thumbelina.PROP_CURRENT_URL_PROPERTY))
        {
            url = (String)event.getNewValue ();
            if (null == url)
                setTitle ("Thumbelina");
            else
                setTitle ("Thumbelina - " + url);
        }
    }

    /**
     * Updates the user preferences based on the most recently used list.
     * @param url The URL that is to be placed at the top of the MRU list.
     */
    public void updateMRU (String url)
    {
        Preferences prefs;
        int count;
        ArrayList list;
        String string;
        int max;

        if (url.startsWith ("http://"))
            url = url.substring (7);
        prefs = Preferences.userNodeForPackage (getClass ());
        count = prefs.getInt (MRULENGTH, -1);
        list = new ArrayList ();
        for (int i = 0; i < count; i++)
        {
            string = prefs.get (MRUPREFIX + i, "");
            if (!"".equals (string) && !url.equalsIgnoreCase (string))
                list.add (string);
        }
        list.add (0, url);
        max = prefs.getInt (MRUMAX, -1);
        if (-1 == max)
            max = 8;
        while (list.size () > max)
            list.remove (max);
        prefs.putInt (MRULENGTH, list.size ());
        prefs.putInt (MRUMAX, max);
        for (int i = 0; i < list.size (); i++)
            prefs.put (MRUPREFIX + i, (String)list.get (i));
        try
        {
            prefs.flush ();
        }
        catch (BackingStoreException bse)
        {
            bse.printStackTrace ();
        }
    }

    /**
     * Opens a user specified URL.
     */
    public void open ()
    {
        String result;

        result = JOptionPane.showInputDialog (
            this,
            "Enter the URL:",
            "Open URL",
            JOptionPane.PLAIN_MESSAGE);
        if (null != result)
        {
            getThumbelina ().open (result);
            updateMRU (result);
            updateMenu ();
        }
    }

    /**
     * Query google via user specified keywords and queue results.
     * Asks the user for keywords, and then submits them as input to the
     * usual google form:
     * <pre>
     * <form action="/search" name=f>
     * <span id=hf></span>
     * <table cellspacing=0 cellpadding=0>
     * <tr valign=middle>
     * <td width=75>&nbsp;</td>
     * <td align=center>
     * <input maxLength=256 size=55 name=q value="">
     * <input type=hidden name=ie value="UTF-8">
     * <input type=hidden name=oe value="UTF-8">
     * <input name=hl type=hidden value=en><br>
     * <input type=submit value="Google Search" name=btnG>
     * <input type=submit value="I'm Feeling Lucky" name=btnI>
     * </td>
     * <td valign=top nowrap><font size=-2>
     *   &nbsp;&#8226; <a href=/advanced_search?hl=en>Advanced Search</a>
     *   <br>&nbsp;&#8226; <a href=/preferences?hl=en>Preferences</a>
     *   <br>&nbsp;&#8226; <a href=/language_tools?hl=en>Language Tools</a>
     * </font>
     * </td>
     * </tr>
     * <tr>
     * <td colspan=3 align=center><font size=-1>
     * Search: <input id=all type=radio name=meta value="" checked>
     * <label for=all> the web</label>
     * <input id=cty type=radio name=meta value="cr=countryCA" >
     * <label for=cty>pages from Canada</label>
     * </font>
     * </td>
     * </tr>
     * </table>
     * </form>
     * </pre>
     * Creates a query of the form:
     * <pre>
     * http://www.google.ca/search?hl=en&ie=UTF-8&oe=UTF-8&q=thumbs&btnG=Google+Search&meta=
     * </pre>
     */
    public void googlesearch ()
    {

        Preferences prefs;
        String query;
        String terms;
        StringBuffer buffer;
        HttpURLConnection connection;
        URL url;
        Lexer lexer;
        URL[][] results;

        prefs = Preferences.userNodeForPackage (getClass ());
        query = prefs.get (GOOGLEQUERY, DEFAULTGOOGLEQUERY);
        try
        {
            query = (String)JOptionPane.showInputDialog (
                this,
                "Enter the search term:",
                "Search Google",
                JOptionPane.PLAIN_MESSAGE,
                null,
                null,
                query);
            if (null != query)
            {
                // replace spaces with +
                terms = query.replace (' ', '+');
                buffer = new StringBuffer (1024);
                buffer.append ("http://www.google.ca/search?");
                buffer.append ("q=");
                buffer.append (terms);
                buffer.append ("&ie=UTF-8");
                buffer.append ("&oe=UTF-8");
                buffer.append ("&hl=en");
                buffer.append ("&btnG=Google+Search");
                buffer.append ("&meta=");
                url = new URL (buffer.toString ());
                connection = (HttpURLConnection)url.openConnection ();
                if (USE_MOZILLA_HEADERS)
                {
                    // These are the Mozilla header fields:
                    //Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,text/css,*/*;q=0.1
                    //Accept-Language: en-us, en;q=0.50
                    //Connection: keep-alive
                    //Host: grc.com
                    //Referer: https://grc.com/x/ne.dll?bh0bkyd2
                    //User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20030225
                    //Content-Length: 27
                    //Content-Type: application/x-www-form-urlencoded
                    //Accept-Encoding: gzip, deflate, compress;q=0.9
                    //Accept-Charset: ISO-8859-1, utf-8;q=0.66, *;q=0.66
                    //Keep-Alive: 300

                    connection.setRequestProperty ("Referer", "http://www.google.ca");
                    connection.setRequestProperty ("Accept", "text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,text/css,*/*;q=0.1");
                    connection.setRequestProperty ("Accept-Language", "en-us, en;q=0.50");
                    connection.setRequestProperty ("User-Agent", "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20030225");
                    connection.setRequestProperty ("Accept-Charset", "ISO-8859-1, utf-8;q=0.66, *;q=0.66");
                }
                else
                {
                    // These are the IE header fields:
                    //Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
                    //Accept-Language: en-ca
                    //Connection: Keep-Alive
                    //Host: grc.com
                    //User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; trieste; .NET CLR 1.1.4322; .NET CLR 1.0.3705)
                    //Content-Length: 32
                    //Content-Type: application/x-www-form-urlencoded
                    //Accept-Encoding: gzip, deflate
                    //Cache-Control: no-cache

                    connection.setRequestProperty ("Accept", "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*");
                    connection.setRequestProperty ("Accept-Language", "en-ca");
                    connection.setRequestProperty ("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; trieste; .NET CLR 1.1.4322; .NET CLR 1.0.3705)");
                }
                connection.setDoOutput (true);
                connection.setDoInput (true);
                connection.setUseCaches (false);
                lexer = new Lexer (connection);
                results = getThumbelina ().extractImageLinks (lexer, url);
                // add 'em
                getThumbelina ().reset ();
                // remove google links, not just append (results[1]);
                for (int i = 0; i < results[1].length; i++)
                {
                    String found = results[1][i].toExternalForm ();
                    if (-1 == found.indexOf ("google"))
                        getThumbelina ().append (results[1][i]);
                }
                prefs.put (GOOGLEQUERY, query);
                try
                {
                    prefs.flush ();
                }
                catch (BackingStoreException bse)
                {
                    bse.printStackTrace ();
                }
            }
        }
        catch (Exception e)
        {
            System.out.println (e.getMessage ());
        }
    }

    /**
     * Display information about Thumbelina.
     */
    public void about ()
    {
        URL url;

        try
        {
            url = new URL ("http://sourceforge.net/sflogo.php?group_id=24399");
        }
        catch (MalformedURLException murle)
        {
            url = null;
        }
        JOptionPane.showMessageDialog (
            this,
            "Scan and display the images behind thumbnails.\n"
            + "\n"
            + "An example application using the HTML Parser project.\n"
            + "Visit http://htmlparser.sourceforge.org for the latest\n"
            + "version and source code.\n",
            "Thumbelina - About",
            JOptionPane.PLAIN_MESSAGE,
            new ImageIcon (url));
    }

    /**
     * Exits the application.
     * Saves user preferences before exiting.
     */
    public void exit ()
    {
        saveState ();
        System.exit (0);
    }

    /**
     * Alternate mainline for Thumbelina.
     * Similar code exists in the Thumbelina class, but this version doesn't
     * worry about java version.
     * @param args The command line arguments.
     * Optionally, arg[0] can be the URL to preload the Thumeblina bean with.
     */
    public static void main (final String[] args)
    {
        String url;
        ThumbelinaFrame thumbelina;

        System.setProperty ("sun.net.client.defaultReadTimeout", "7000");
        System.setProperty ("sun.net.client.defaultConnectTimeout", "7000");

        url = null;
        if (0 != args.length)
            if (args[0].equalsIgnoreCase ("help")
                || args[0].equalsIgnoreCase ("-help")
                || args[0].equalsIgnoreCase ("-h")
                || args[0].equalsIgnoreCase ("?")
                || args[0].equalsIgnoreCase ("-?"))
                Thumbelina.help ();
            else
                url = args[0];

        try
        {
            thumbelina = new ThumbelinaFrame (url);
            thumbelina.setVisible (true);
        }
        catch (MalformedURLException murle)
        {
            System.err.println (murle.getMessage ());
            Thumbelina.help ();
        }
    }
}