jnotepad.java

一个模拟文字编辑器

        file.add(jmi = new JMenuItem("New", KeyEvent.VK_N));
        jmi.addActionListener(new newL());
        file.add(jmi = new JMenuItem("Open", KeyEvent.VK_O));
        jmi.addActionListener(new openL());
        file.add(jmi = new JMenuItem("Save", KeyEvent.VK_S));
        jmi.addActionListener(new saveL());
        file.addSeparator();
        file.add(jmi = new JMenuItem("Page Setup", KeyEvent.VK_G));
        jmi.addActionListener(new pageSetupL());
        file.add(jmi = new JMenuItem("Print", KeyEvent.VK_P));
        jmi.addActionListener(new printL());
        file.addSeparator();
        file.add(jmi = new JMenuItem("Exit", KeyEvent.VK_X));
        jmi.addActionListener(new exitL());

        edit.add(jmi = new JMenuItem("Copy", KeyEvent.VK_C));
        jmi.addActionListener(new copyL());
        edit.add(jmi = new JMenuItem("Cut", KeyEvent.VK_T));
        jmi.addActionListener(new cutL());
        edit.add(jmi = new JMenuItem("Paste", KeyEvent.VK_P));
        jmi.addActionListener(new pasteL());
        edit.add(jmi = new JMenuItem("Delete", KeyEvent.VK_D));
        jmi.addActionListener(new deleteL());
        edit.addSeparator();
        edit.add(jmi = new JMenuItem("Select All", KeyEvent.VK_A));
        jmi.addActionListener(new selectAllL());

        search.add(jmi = new JMenuItem("Find", KeyEvent.VK_F));
        jmi.addActionListener(new findL());
        search.add(jmi = new JMenuItem("Find Next", KeyEvent.VK_N));
        jmi.addActionListener(new findNextL());

        help.add(jmi = new JMenuItem("About", KeyEvent.VK_A));
        jmi.addActionListener(new aboutL());

        setLayout(new BorderLayout());
        file.setMnemonic(KeyEvent.VK_F);
        jmb.add(file);
        edit.setMnemonic(KeyEvent.VK_E);
        jmb.add(edit);
        search.setMnemonic(KeyEvent.VK_S);
        jmb.add(search);
        jmb.add(Box.createHorizontalGlue());
        help.setMnemonic(KeyEvent.VK_H);
        jmb.add(help);

        toolBar.setFloatable(false);
        addButtons(toolBar);

        add(jmb, BorderLayout.NORTH);
        add(toolBar, BorderLayout.CENTER);
        add(jsp, BorderLayout.SOUTH);

        jta.getCaret().setVisible(true);
        jta.setCaretPosition(0);
      }

      public static void main(String args[])
      {
       JFrame f = new JFrame();
       JNotepad applet = new JNotepad();
       f.setTitle("JNotepad");
       f.setBackground(Color.lightGray);
       f.getContentPane().add(applet, BorderLayout.CENTER);
       f.addWindowListener(new appCloseL());
        f.setSize(800, 500);
        f.setVisible(true);
    }

    protected void addButtons(JToolBar toolBar)
    {
        JButton button = new JButton(new ImageIcon("images/new.gif"));
        button.setToolTipText("Create a new document");
        button.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                jta.setDocument(new PlainDocument());
            }
        });
        toolBar.add(button);

        JButton button1 = new JButton(new ImageIcon("images/open.gif"));
        button1.setToolTipText("Open a document");
        button1.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                JFileChooser fc = new JFileChooser();
                int returnVal = fc.showDialog(JNotepad.this, "Open file");
                if(returnVal == JFileChooser.APPROVE_OPTION)
                {
                    String file = fc.getSelectedFile().getPath();
                    if(file == null)
                    {
                        return;
                    }
                    try
                    {
                        Reader in = new FileReader(file);
                        char[] buff = new char[4096];
                        int nch;
                        while((nch = in.read(buff, 0, buff.length)) != -1)
                        {
                            jta.setDocument(new PlainDocument());
                            jta.append(new String(buff, 0, nch));
                        }
                    }
                    catch (IOException io)
                    {
                        System.err.println("IOException: " + io.getMessage());
                    }
                }
                else
                {
                    return;
                }
            }
        });
        toolBar.add(button1);

        JButton button2 = new JButton(new ImageIcon("images/save.gif"));
        button2.setToolTipText("Save the document");
        button2.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                JFileChooser fc = new JFileChooser();
                int returnVal = fc.showSaveDialog(JNotepad.this);
                if(returnVal == JFileChooser.APPROVE_OPTION)
                {
                    String savefile = fc.getSelectedFile().getPath();
                    if(savefile == null)
                    {
                        return;
                    }
                    else
                    {
                        String docToSave = jta.getText();
                        if(docToSave != null)
                        {
                            FileOutputStream fstrm = null;
                            BufferedOutputStream ostrm = null;
                            try
                            {
                                fstrm = new FileOutputStream(savefile);
                                ostrm = new BufferedOutputStream(fstrm);
                                byte[] bytes = null;
                                try
                                {
                                    bytes = docToSave.getBytes();
                                }
                                catch(Exception e1)
                                {
                                    e1.printStackTrace();
                                }
                                ostrm.write(bytes);
                            }
                           catch(IOException io)
                           {
                               System.err.println("IOException: " +
                                       io.getMessage());
                           }
                           finally
                           {
                                try
                                {
                                    ostrm.flush();
                                    fstrm.close();
                                    ostrm.close();
                                }
                                catch(IOException ioe)
                                {
                                    System.err.println("IOException: " +
                                            ioe.getMessage());
                                }
                            }
                        }
                    }
                }
                else
                {
                    return;
                }
            }
        });
        toolBar.add(button2);

        JButton button3 = new JButton(new ImageIcon("images/copy.gif"));
        button3.setToolTipText("Copy selected text");
        button3.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                String selection = jta.getSelectedText();
                StringSelection clipString = new StringSelection(selection);
                clipbd.setContents(clipString, clipString);
            }
        });
        toolBar.add(button3);

        JButton button4 = new JButton(new ImageIcon("images/cut.gif"));
        button4.setToolTipText("Cut selected text");
        button4.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                String selection = jta.getSelectedText();
                StringSelection clipString = new StringSelection(selection);
                clipbd.setContents(clipString, clipString);
                jta.replaceRange("", jta.getSelectionStart(),
                    jta.getSelectionEnd());
            }
        });
        toolBar.add(button4);

        JButton button5 = new JButton(new ImageIcon("images/paste.gif"));
        button5.setToolTipText("Paste clipboard");
        button5.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                Transferable clipData = clipbd.getContents(JNotepad.this);
                try
                {
                    String clipString =
                            (String)clipData.getTransferData(
                            DataFlavor.stringFlavor);
                    jta.replaceRange(clipString,
                            jta.getSelectionStart(), jta.getSelectionEnd());
                }
                catch(Exception ex)
                {
                }
            }
        });
        toolBar.add(button5);

        JButton button6 = new JButton(new ImageIcon("images/about.gif"));
        button6.setToolTipText("About application");
        button6.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                JOptionPane.showMessageDialog(null,
                    "ABOUT.");
            }
        });
        toolBar.add(button6);
    }

      protected static final class appCloseL extends WindowAdapter
    {
        public void windowClosing(WindowEvent e)
        {
            System.exit(0);
        }
    }
}