beanybaby.java

html 解析处理代码

// HTMLParser Library $Name: v1_6 $ - A java-based parser for HTML
// http://sourceforge.org/projects/htmlparser
// Copyright (C) 2004 Derrick Oswald
//
// Revision Control Information
//
// $Source: /cvsroot/htmlparser/htmlparser/src/org/htmlparser/beans/BeanyBaby.java,v $
// $Author: derrickoswald $
// $Date: 2005/05/15 11:49:03 $
// $Revision: 1.25 $
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//

package org.htmlparser.beans;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.beans.PropertyChangeListener;
import java.util.Vector;

import javax.swing.JCheckBoxMenuItem;
import javax.swing.JMenuItem;

/**
 * Demo of beans.
 * Created on December 30, 2002, 7:54 PM
 * @author Derrick Oswald
 */
public class BeanyBaby
    extends
        javax.swing.JFrame
    implements
        PropertyChangeListener,
        ActionListener,
        MouseListener
{
    /**
     * Bread crumb trail of visited URLs.
     */
    protected Vector mTrail;

    /**
     * Current position on the bread crumb trail.
     */
    protected int mCrumb;

    /** Creates new form BeanyBaby */
    public BeanyBaby ()
    {
        initComponents ();
        mTrail = new Vector ();
        mCrumb = -1;

        // shenanigans to get the splitter bar at the midpoint
        setVisible (true);
        mSplitPane.setDividerLocation (0.5); // 50% for each pane
        setVisible (false);

        // set up twinning
        mLinkBean.addPropertyChangeListener (this);
        mStringBean.addPropertyChangeListener (this);
        // set up user input
        mTextField.addActionListener (this);
        mLinkBean.addMouseListener (this);

        // set initial checkbox states
        mLinks.setSelected (mStringBean.getLinks ());
        mCollapse.setSelected (mStringBean.getCollapse ());
        mNobreak.setSelected (mStringBean.getReplaceNonBreakingSpaces ());
    }

    //
    // PropertyChangeListener interface
    //

    /**
     * This method ties the two beans together on the same connection.
     * Whenever a property changes on one bean, make sure the URL properties
     * agree by setting the URL from one to the other.
     * @param event The event describing the event source
     * and the property that has changed.
     */
    public void propertyChange (java.beans.PropertyChangeEvent event)
    {
        Object source;
        String name;

        source = event.getSource ();
        if (source == mLinkBean)
        {
            if (!mLinkBean.getURL ().equals (mStringBean.getURL ()))
                mStringBean.setURL (mLinkBean.getURL ());
        }
        else if (source == mStringBean)
        {
            if (!mStringBean.getURL ().equals (mLinkBean.getURL ()))
                mLinkBean.setURL (mStringBean.getURL ());
            // check for menu status changes
            name = event.getPropertyName ();
            if (name.equals (StringBean.PROP_LINKS_PROPERTY))
                mLinks.setSelected (
                    ((Boolean)event.getNewValue ()).booleanValue ());
            else if (name.equals (StringBean.PROP_COLLAPSE_PROPERTY))
                mCollapse.setSelected (
                    ((Boolean)event.getNewValue ()).booleanValue ());
            else if (name.equals (StringBean.PROP_REPLACE_SPACE_PROPERTY))
                mNobreak.setSelected (
                    ((Boolean)event.getNewValue ()).booleanValue ());
        }
    }

    //
    // ActionListener interface
    //

    /**
     * Handles UI events.
     * Changing the URL in the text field, altering a checkbox setting or
     * choosing a menu item winds up here, where the appropriate change
     * is made to the state of the bean.
     * @param event Details about the action.
     */
    public void actionPerformed (ActionEvent event)
    {
        Object source;
        String url;
        String name;
        JMenuItem item;

        source = event.getSource ();
        if (source == mTextField)
        {
            url = mTextField.getText ();
            mTextField.selectAll ();
            setURL (url);
        }
        else if (source instanceof JCheckBoxMenuItem)
        {
            item = (JMenuItem)source;
            name = item.getName ();
            if ("Links".equals (name))
                mStringBean.setLinks (item.isSelected ());
            else if ("Collapse".equals (name))
                mStringBean.setCollapse (item.isSelected ());
            else if ("Nobreak".equals (name))
                mStringBean.setReplaceNonBreakingSpaces (item.isSelected ());
        }
        else if (source instanceof JMenuItem)
        {
            name = ((JMenuItem)source).getName ();
            if ("Back".equals (name))
            {
                if (mCrumb > 0)
                {
                    mCrumb--;
                    url = (String)mTrail.elementAt (mCrumb);
                    mCrumb--;
                    setURL (url);
                }
            }
            else if ("Forward".equals (name))
            {
                if (mCrumb < mTrail.size ())
                {
                    mCrumb++;
                    url = (String)mTrail.elementAt (mCrumb);
                    mCrumb--;
                    setURL (url);
                }
            }
        }

    }

    //
    // MouseListener interface
    //

    /**
     * Invoked when the mouse button has been clicked on a component.
     * A mouse click is a press and release of a mouse button.
     * @param event Details on the mouse event.
     */
    public void mouseClicked (MouseEvent event)
    {
        int index;
        String url;

        if (2 == event.getClickCount())
        {
            index = mLinkBean.locationToIndex (event.getPoint ());
            url = mLinkBean.getModel ().getElementAt (index).toString ();
            setURL (url);
        }
    }

    /**
     * Invoked when the mouse enters a component.
     * @param event Details on the mouse event.
     */
    public void mouseEntered (MouseEvent event)
    {
    }

    /**
     * Invoked when the mouse exits a component.
     * @param event Details on the mouse event.
     */
    public void mouseExited (MouseEvent event)
    {
    }

    /**
     * Invoked when a mouse button has been pressed on a component.
     * @param event Details on the mouse event.
     */
    public void mousePressed (MouseEvent event)
    {
    }

    /**
     * Invoked when a mouse button has been released on a component.
     * @param event Details on the mouse event.
     */
    public void mouseReleased (MouseEvent event)
    {
    }

    //
    // API control
    //

    /**
     * Set the URL for the bean.
     * @param url The URL to use in the bean.
     */
    public void setURL (String url)
    {
        mTextField.setText (url);
        mCrumb++;
        if (mTrail.size () <= mCrumb)
            mTrail.addElement (url);
        else
            mTrail.setElementAt (url, mCrumb);
        mLinkBean.setURL (url);

        // update navigation menu
        mBack.setEnabled (mCrumb > 0);
        mForward.setEnabled (mCrumb + 1 < mTrail.size ());
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    private void initComponents()//GEN-BEGIN:initComponents
    {
        javax.swing.JMenuBar menubar;
        javax.swing.JScrollPane pane1;
        javax.swing.JScrollPane pane2;
        javax.swing.JMenu go;
        javax.swing.JMenu options;
        javax.swing.JPanel panel;

        menubar = new javax.swing.JMenuBar();
        setJMenuBar (menubar);
        go = new javax.swing.JMenu();
        mBack = new javax.swing.JMenuItem();
        mForward = new javax.swing.JMenuItem();
        options = new javax.swing.JMenu();
        mLinks = new javax.swing.JCheckBoxMenuItem();
        mCollapse = new javax.swing.JCheckBoxMenuItem();
        mNobreak = new javax.swing.JCheckBoxMenuItem();
        panel = new javax.swing.JPanel();
        mSplitPane = new javax.swing.JSplitPane();
        pane1 = new javax.swing.JScrollPane();
        mLinkBean = new org.htmlparser.beans.HTMLLinkBean();
        pane2 = new javax.swing.JScrollPane();
        mStringBean = new org.htmlparser.beans.HTMLTextBean();
        mTextField = new javax.swing.JTextField();

        go.setMnemonic('G');
        go.setText("Go");
        go.setToolTipText("crude URL navigation");
        mBack.setMnemonic('B');
        mBack.setText("Back");
        mBack.setToolTipText("back one URL");
        mBack.setName("Back");
        mBack.addActionListener (this);
        go.add(mBack);

        mForward.setMnemonic('F');
        mForward.setText("Forward");
        mForward.setToolTipText("forward one URL");
        mForward.setName("Forward");
        mForward.addActionListener (this);
        go.add(mForward);

        menubar.add(go);

        options.setMnemonic('O');
        options.setText("Options");
        options.setToolTipText("Bean settings");
        mLinks.setMnemonic('L');
        mLinks.setText("Links");
        mLinks.setToolTipText("show/hide links in text");
        mLinks.setName("Links");
        mLinks.addActionListener (this);
        options.add(mLinks);

        mCollapse.setMnemonic('C');
        mCollapse.setText("Collapse");
        mCollapse.setToolTipText("collapse/retain whitespace sequences");
        mCollapse.setName("Collapse");
        mCollapse.addActionListener (this);
        options.add(mCollapse);

        mNobreak.setMnemonic('N');
        mNobreak.setText("Non-breaking Spaces");
        mNobreak.setToolTipText("replace/retain non-breaking spaces");
        mNobreak.setName("Nobreak");
        mNobreak.addActionListener (this);
        options.add(mNobreak);

        menubar.add(options);

        setTitle("BeanyBaby");
        addWindowListener(new WindowAdapter()
        {
            public void windowClosing(WindowEvent evt)
            {
                exitForm(evt);
            }
        });

        panel.setLayout(new BorderLayout());

        pane1.setViewportView(mLinkBean);

        mSplitPane.setLeftComponent(pane1);

        pane2.setViewportView(mStringBean);

        mSplitPane.setRightComponent(pane2);

        panel.add(mSplitPane, BorderLayout.CENTER);

        mTextField.setToolTipText("Enter the URL to view");
        panel.add(mTextField, BorderLayout.SOUTH);

        getContentPane().add(panel, BorderLayout.CENTER);

        pack();
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        setSize(new Dimension(640, 480));
        setLocation((screenSize.width-640)/2,(screenSize.height-480)/2);
    }//GEN-END:initComponents

    /** Exit the Application
     * @param event Details about the window event. */
    private void exitForm (WindowEvent event)
    {//GEN-FIRST:event_exitForm
        System.exit (0);
    }//GEN-LAST:event_exitForm

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private org.htmlparser.beans.HTMLLinkBean mLinkBean;
    private javax.swing.JMenuItem mForward;
    private javax.swing.JMenuItem mBack;
    private javax.swing.JCheckBoxMenuItem mCollapse;
    private javax.swing.JTextField mTextField;
    private javax.swing.JSplitPane mSplitPane;
    private javax.swing.JCheckBoxMenuItem mLinks;
    private org.htmlparser.beans.HTMLTextBean mStringBean;
    private javax.swing.JCheckBoxMenuItem mNobreak;
    // End of variables declaration//GEN-END:variables

    /**
     * Unit test.
     * @param args [0] The URL to use in the bean (optional).
     */
    public static void main (String[] args)
    {
        BeanyBaby bb = new BeanyBaby ();
        bb.setVisible (true);
        if (0 >= args.length)
            bb.setURL ("http://www.slashdot.org");
        else
            bb.setURL (args[0]);
    }
}