mynotepad.java

Java记事本,类似于Windows附带的记事本

        popupMenu_Undo = new JMenuItem("撤销(Z)");
        popupMenu_Redo = new JMenuItem("恢复撤销(B)");
        popupMenu_Cut = new JMenuItem("剪切(X)");
        popupMenu_Copy = new JMenuItem("复制(C)");
        popupMenu_Paste = new JMenuItem("粘贴(V)");
        popupMenu_Delete = new JMenuItem("删除(D)");
        popupMenu_SelectAll = new JMenuItem("全选(A)");

        popupMenu_Undo.setMnemonic('Z');
        popupMenu_Redo.setMnemonic('B');
        popupMenu_Cut.setMnemonic('X');
        popupMenu_Copy.setMnemonic('C');
        popupMenu_Paste.setMnemonic('V');
        popupMenu_Delete.setMnemonic('D');
        popupMenu_SelectAll.setMnemonic('A');

        popupMenu.add(popupMenu_Undo);
        popupMenu.add(popupMenu_Redo);
        popupMenu.addSeparator();
        popupMenu.add(popupMenu_Cut);
        popupMenu.add(popupMenu_Copy);
        popupMenu.add(popupMenu_Paste);
        popupMenu.addSeparator();
        popupMenu.add(popupMenu_Delete);
        popupMenu.addSeparator();
        popupMenu.add(popupMenu_SelectAll);

        popupMenu_Undo.addActionListener(this);
        popupMenu_Redo.addActionListener(this);
        popupMenu_Cut.addActionListener(this);
        popupMenu_Copy.addActionListener(this);
        popupMenu_Paste.addActionListener(this);
        popupMenu_Delete.addActionListener(this);
        popupMenu_SelectAll.addActionListener(this);

        //$$$$$$$$$$$$$$右键菜单完毕$$$$$$$$$$$$$$$$$$$$$$  

        this.getContentPane().add(tbar, BorderLayout.NORTH);
        JScrollPane scrPane = new JScrollPane(tex);
        scrPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
        getContentPane().add(scrPane);
        //以下为实现撤销功能  
        tex.getDocument().addUndoableEditListener(new UndoableEditListener() {
            public void undoableEditHappened(UndoableEditEvent e) {//添加撤销管理器
                undo.addEdit(e.getEdit());
            }
        });

        tex.getDocument().addDocumentListener(this);//添加监听器
        setJMenuBar(mb);

        statusLabel = new JLabel("按Ctrl+F1获取帮助");//添加状态栏
        this.getContentPane().add(statusLabel, BorderLayout.SOUTH);
        setSize(580, 700);
        this.show(true);
    }

//￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥事件处理部分
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == bt_new || e.getSource() == mi1) {//新建
            tex.requestFocusInWindow();
            Object[] options = {"确定", "取消"};
            int s = JOptionPane.showOptionDialog(null, "请注意保存文档！按“确定”新建文件",
                    "警告！", JOptionPane.DEFAULT_OPTION,
                    JOptionPane.WARNING_MESSAGE, null, options, options[0]);
            if (s == JOptionPane.YES_OPTION) {
                tex.setText("");
            }
            statusLabel.setText("空白文档");
            file = null;

        } else if (e.getSource() == mi2 || e.getSource() == bt_open) {//打开
            tex.requestFocusInWindow();
            if (file != null) {
                filechooser.setSelectedFile(file);
            }
            filechooser.addChoosableFileFilter(new JAVAFileFilter("txt"));//实现文件过滤，见下面的JAVAFileFilter类
            filechooser.addChoosableFileFilter(new JAVAFileFilter("c"));
            filechooser.addChoosableFileFilter(new JAVAFileFilter("cpp"));
            filechooser.addChoosableFileFilter(new JAVAFileFilter("sql"));
            filechooser.addChoosableFileFilter(new JAVAFileFilter("doc"));
            filechooser.addChoosableFileFilter(new JAVAFileFilter("class"));
            filechooser.addChoosableFileFilter(new JAVAFileFilter("java"));
            int returnVal = filechooser.showOpenDialog(DaveNotepad.this);
            if (returnVal == JFileChooser.APPROVE_OPTION) {
                file = filechooser.getSelectedFile();
                openFile(tex);
                isNewfile = false; //文件为已保存的
                statusLabel.setText("当前打开文件:" + file.getAbsoluteFile() + "   行：" + Integer.toString(tex.getRows()) + " 列：" + Integer.toString(tex.getColumns()));//设置状态栏显示当前打开文档的路径和文件名
                tex.setCaretPosition(0);//设置光标的位置在开始

            }
        } else if (e.getSource() == mi3 || e.getSource() == bt_save) {//保存
            tex.requestFocusInWindow();
            saveFile(tex);

        } else if (e.getSource() == mi4) { //另存为
            tex.requestFocusInWindow();
            isNewfile = true;
            saveFile(tex);

        } else if (e.getSource() == mi5) {//页面设置
            tex.requestFocusInWindow();
        } else if (e.getSource() == mi6) {//打印
            tex.requestFocusInWindow();
            try {
                tex.print();
            } catch (PrinterException e1) {
                e1.printStackTrace();
            }
        } else if (e.getSource() == mi7) {//退出
            tex.requestFocusInWindow();
            quitProg();
        } else if (e.getSource() == me1 || e.getSource() == bt_undo || e.getSource() == popupMenu_Undo) {//撤销
            tex.requestFocusInWindow();

            if (undo.canUndo()) {
                try {
                    undo.undo();
                    me12.setEnabled(true);
                    popupMenu_Redo.setEnabled(true);
                    bt_redo.setEnabled(true);
                } catch (CannotUndoException ex) {
                    System.out.println("Unable to undo: " + ex);
                    ex.printStackTrace();
                }
            }
            if (!undo.canUndo()) {
                me1.setEnabled(false);
                popupMenu_Undo.setEnabled(false);
                bt_undo.setEnabled(false);

                me12.setEnabled(true);
                popupMenu_Redo.setEnabled(true);
                bt_redo.setEnabled(true);
            }
        } else if (e.getSource() == me12 || e.getSource() == bt_redo || e.getSource() == popupMenu_Redo) {//恢复撤销
            tex.requestFocusInWindow();

            if (undo.canRedo()) {
                try {
                    undo.redo();
                    me12.setEnabled(true);
                    popupMenu_Redo.setEnabled(true);
                    bt_redo.setEnabled(true);
                } catch (CannotUndoException ex) {
                    System.out.println("Unable to redo: " + ex);
                    ex.printStackTrace();
                }
            }
            if (!undo.canRedo()) {
                me1.setEnabled(true);
                popupMenu_Undo.setEnabled(true);
                bt_undo.setEnabled(true);

                me12.setEnabled(false);
                popupMenu_Redo.setEnabled(false);
                bt_redo.setEnabled(false);
            }
        } else if (e.getSource() == me2 || e.getSource() == bt_cut || e.getSource() == popupMenu_Cut) {//剪切
            tex.requestFocusInWindow();
            tex.cut();
            checkMenuItemEnabled();//检查菜单的可用性
        } else if (e.getSource() == me3 || e.getSource() == bt_copy || e.getSource() == popupMenu_Copy) {//复制
            tex.requestFocusInWindow();
            tex.copy();
            checkMenuItemEnabled();//检查菜单的可用性
        } else if (e.getSource() == me4 || e.getSource() == bt_paste || e.getSource() == popupMenu_Paste) {//粘贴
            tex.requestFocusInWindow();
            tex.paste();
            checkMenuItemEnabled();//检查菜单的可用性
        } else if (e.getSource() == me5 || e.getSource() == popupMenu_Delete) {//删除
            tex.requestFocusInWindow();
            String sCopy = tex.getSelectedText();//获取当前选中文本
            if (sCopy != null) {
                tex.replaceSelection("");
            }
            checkMenuItemEnabled();//检查菜单的可用性
        } else if (e.getSource() == me6) {//查找
            tex.requestFocusInWindow();
            mySearch();
        } else if (e.getSource() == me7) {//查找下一个
            tex.requestFocusInWindow();
            mySearch();
        } else if (e.getSource() == me8) {//替换
            tex.requestFocusInWindow();
            mySearch();
        } else if (e.getSource() == me9) {//转到
            tex.requestFocusInWindow();
        } else if (e.getSource() == me10 || e.getSource() == popupMenu_SelectAll) {//全选
            tex.requestFocusInWindow();
            tex.selectAll();
        } else if (e.getSource() == me11) {//时间/日期
            tex.requestFocusInWindow();
            getDate();
        } else if (e.getSource() == mo1) { //设置文本域可以自动换行
            tex.requestFocusInWindow();
            if (tex.getLineWrap()) {
                tex.setLineWrap(false);
            } else {
                tex.setLineWrap(true);
            }
        } else if (e.getSource() == mo2) {//字体
            tex.requestFocusInWindow();
            SetFont setfont = new SetFont(tex);
        } else if (e.getSource() == mh1) {//帮助主题

            helpFrame();
        } else if (e.getSource() == mh2) {//关于本记事本
            aboutFrame();
        } else if (e.getSource() == bt_bold) {//粗体设置
            Font newfont;
            if (tex.getFont().getStyle() == Font.BOLD) {
                newfont = new Font(tex.getFont().getName(), Font.PLAIN, tex.getFont().getSize());
            } else if (tex.getFont().getStyle() == Font.BOLD + Font.ITALIC) {
                newfont = new Font(tex.getFont().getName(), Font.PLAIN + Font.ITALIC, tex.getFont().getSize());
            } else {
                newfont = new Font(tex.getFont().getName(), tex.getFont().getStyle() + Font.BOLD, tex.getFont().getSize());
            }
            tex.setFont(newfont);
        } else if (e.getSource() == bt_italic) {
            Font newfont;
            if (tex.getFont().getStyle() == Font.ITALIC) {
                newfont = new Font(tex.getFont().getName(), Font.PLAIN, tex.getFont().getSize());
            } else if (tex.getFont().getStyle() == Font.ITALIC + Font.BOLD) {
                newfont = new Font(tex.getFont().getName(), Font.PLAIN + Font.BOLD, tex.getFont().getSize());
            } else {
                newfont = new Font(tex.getFont().getName(), tex.getFont().getStyle() + Font.ITALIC, tex.getFont().getSize());
            }
            tex.setFont(newfont);
        } else if (e.getActionCommand() == "Type") {
            Font newfont = new Font(fontname, tex.getFont().getStyle(), tex.getFont().getSize());
            tex.setFont(newfont);
        } else if (e.getActionCommand() == "Size") {
            Font newfont = new Font(tex.getFont().getName(), tex.getFont().getStyle(), fontsize);
            tex.setFont(newfont);
        }

    }

    //￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥￥事件处理结束
    void quitProg() { //退出菜单的响应
        Object[] options = {"确定", "取消"};
        int s = JOptionPane.showOptionDialog(null, "请注意保存文档！按“确定”退出", "警告！",
                JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE, null,
                options, options[0]);
        if (s == JOptionPane.YES_OPTION) {
            System.exit(0);
        }
    }

    void getDate() { //获取当前系统日期和时间，对“日期/时间”菜单的响应
        SimpleDateFormat TimeFormat = new SimpleDateFormat(
                " yyyy-MM-dd HH:mm:ss ");
        Calendar curdate = Calendar.getInstance();
        curdate = Calendar.getInstance(Locale.CHINESE); //以上为获取系统当前的日期和时间
        tex.insert(TimeFormat.format(curdate.getTime()), tex.getCaretPosition()); //将获得的日期和时间添加到文本的当前位置
    }

    void helpFrame() { //帮助菜单的弹出窗口
        Icon help_icon = new ImageIcon("icons//doit.jpg");
        String help = "感谢您的使用！\n本记事本程序暂无帮助，您可以参考WindowsXP的记事本帮助程序！\n" + "欢迎和作者联系交流！\n" + "Build By Davezhang\nQQ:442803117\nBolg:http://hi.baidu.com.442803117" + "\nEmail:[e-mail]";
        JOptionPane.showConfirmDialog(null, help, "帮助",
                JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE,
                help_icon);
    }

    void aboutFrame() {//“关于本记事本”菜单的弹出窗口
        Icon help_icon = new ImageIcon("icons//doit.jpg");
        String help = "DOIT(R)记事本\n版本1.0 (内部版本号 2008.xp_sp2_dave.080423-10)\n版权" + "所有 （C） 2008-2008 DOIT。\n最终解释权归本人所有，" + "授权给：\n\nBuild By Davezhang\nQQ:442803117\nBolg:http://hi.baidu.com.442803117" + "\nEmail:[e-mail]";
        JOptionPane.showConfirmDialog(null, help, "帮助",
                JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE,
                help_icon);
    }

//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$保存文件和另存为文件
    void saveFile(JTextArea text) {//保存文件和另存为文件
        tex.requestFocusInWindow();
        if (isNewfile) { //如果是未保存过的文件

            JFileChooser fileChooser = new JFileChooser();
            /*fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
            fileChooser.addChoosableFileFilter(new JAVAFileFilter("txt"));
            fileChooser.addChoosableFileFilter(new JAVAFileFilter("c"));
            fileChooser.addChoosableFileFilter(new JAVAFileFilter("cpp"));
            fileChooser.addChoosableFileFilter(new JAVAFileFilter("sql"));     
            fileChooser.addChoosableFileFilter(new JAVAFileFilter("doc"));
            fileChooser.addChoosableFileFilter(new JAVAFileFilter("class"));
            fileChooser.addChoosableFileFilter(new JAVAFileFilter("java"));*/
            fileChooser.setApproveButtonText("确定");
            fileChooser.setDialogTitle("另存为");

            int result = fileChooser.showSaveDialog(this);

            if (result == JFileChooser.CANCEL_OPTION) {
                statusLabel.setText("没有选择任何文件");
                return;
            }

            File saveFileName = fileChooser.getSelectedFile();
            if (saveFileName == null || saveFileName.getName().equals("")) {
                JOptionPane.showMessageDialog(this, "不合法的文件名", "不合法的文件名",
                        JOptionPane.ERROR_MESSAGE);
            } else {
                try {
                    FileWriter fw = new FileWriter(saveFileName);
                    BufferedWriter bfw = new BufferedWriter(fw);
                    bfw.write(tex.getText(), 0, tex.getText().length());
                    bfw.flush();
                    fw.close();
                    isNewfile = false;
                    file = saveFileName;
                    oldValue = tex.getText();
                    statusLabel.setText("　当前打开文件:" + saveFileName.getAbsoluteFile());
                } catch (IOException ioException) {
                }
            }
        } else {//isNewfile为flase时，即文件已经保存过的情况
            try {
                FileWriter fw = new FileWriter(file);
                BufferedWriter bfw = new BufferedWriter(fw);
                bfw.write(tex.getText(), 0, tex.getText().length());
                bfw.flush();
                fw.close();
            } catch (IOException ioException) {
            }
        }
    }

//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$打开文件
    void openFile(JTextArea text) { //打开文件
        try {
            FileReader fr = new FileReader(file);
            int len = (int) file.length();
            char[] buffer = new char[len];
            fr.read(buffer, 0, len);
            fr.close();
            text.setText(new String(buffer));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$查找和替换功能$$$$$$$$$$$$$$$$$$
    public void mySearch() {
        final JDialog findDialog = new JDialog(this, "查找与替换", true);
        Container con = findDialog.getContentPane();
        con.setLayout(new FlowLayout(FlowLayout.LEFT));

        JLabel searchContentLabel = new JLabel("查找内容(N) :");