public class EditorDemo extendsJFrame {public static final String MAX_LINE_NUM = "9999";private JTextPane textPane = new JTextPane(); //文本窗格，编辑窗口

private JLabel timeStatusBar = new JLabel(); //时间状态栏

private JLabel caretStatusBar = new JLabel(); //光标位置状态栏

private JFileChooser filechooser = new JFileChooser(); //文件选择器

private JPanel linePane = new JPanel(new FlowLayout(FlowLayout.CENTER, 0, 0));private int lineNum = 0;private MyFont myFont = null;private voidinitTextPaneDocument(){

textPane.getDocument().addDocumentListener(newDocumentListener() {

@Overridepublic voidchangedUpdate(DocumentEvent e) {}

@Overridepublic void insertUpdate(finalDocumentEvent e) {new Thread(newRunnable() {

@Overridepublic voidrun() {

DecorateKeyWords.decorateKeyWords(textPane, myFont);

}

}).start();

}

@Overridepublic voidremoveUpdate(DocumentEvent e) {new Thread(newRunnable() {

@Overridepublic voidrun() {

String text;try{

text= textPane.getDocument().getText(0, textPane.getDocument().getLength()).replaceAll("\\r", "");

Pattern pattern= Pattern.compile("\\n");

Matcher matcher=pattern.matcher(text);int lineRow = 1;while(matcher.find()){//计算行数

++lineRow;

}while(lineRow

linePane.remove(linePane.getComponentCount()-1);

}

linePane.updateUI();

}catch(BadLocationException ex) {

ex.printStackTrace();

}finally{

DecorateKeyWords.decorateKeyWords(textPane, myFont);

}

}

}).start();

}

});

}public EditorDemo() { //构造函数

super("简单的文本编辑器"); //调用父类构造函数//初始字体

myFont = newMyFont();

myFont.setColor(Color.black);

myFont.setFont(new Font("宋体", Font.PLAIN, 24));

myFont.setSizeIndex(19);

myFont.setStyleIndex(0);

myFont.setColorIndex(0);

Action[] actions= //Action数组,各种操作命令

{newNewAction(),newOpenAction(),newSaveAction(),newCutAction(),newCopyAction(),newPasteAction(),newNewFontStyle(),newAboutAction(),newExitAction()

};

textPane.addKeyListener(newKeyAdapter() {

@Overridepublic voidkeyPressed(KeyEvent e) {super.keyPressed(e);if(e.getKeyCode() ==KeyEvent.VK_ENTER) {//添加新的行号

addLineNum();

}

}

});

textPane.addCaretListener(newCaretListener() {

@Overridepublic voidcaretUpdate(CaretEvent e) {try{

String text= textPane.getDocument().getText(0, e.getDot()).replaceAll("\\r", "");

Pattern pattern= Pattern.compile("\\n");

Matcher matcher=pattern.matcher(text);int lineRow = 1;int lastLineBeginPos = -1;//记录文本中最后一行的开始的位置

while(matcher.find()){//计算行数

++lineRow;

lastLineBeginPos= matcher.start();//得到下一行光标所在的位置(根据上一行的换行符)

}int lineCol = e.getDot() -lastLineBeginPos;//显示行号和列号

caretStatusBar.setText("光标 " + lineRow + " : " +lineCol);

}catch(BadLocationException ey) {

ey.printStackTrace();

}

}

});

initTextPaneDocument();

setJMenuBar(createJMenuBar(actions));//设置菜单栏

add(createJToolBar(actions), BorderLayout.NORTH); //增加工具栏

JPanel textBackPanel = new JPanel(newBorderLayout());

textBackPanel.add(linePane, BorderLayout.WEST);//增加行号面板

textBackPanel.add(textPane, BorderLayout.CENTER);//增加文本面板

add(new JScrollPane(textBackPanel), BorderLayout.CENTER); //文本窗格嵌入到JscrollPane

JPanel statusPane = new JPanel(new FlowLayout(FlowLayout.LEFT, 50, 0));

statusPane.add(caretStatusBar);

statusPane.add(timeStatusBar);//初始化光标位置

caretStatusBar.setText("光标 1 : 1");//初始化系统时间显示

new Timer().schedule(newTimerTask() {

@Overridepublic voidrun() {

Date now= newDate();

SimpleDateFormat dateFormat= new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//可以方便地修改日期格式

timeStatusBar.setText(dateFormat.format(now));

}

},0, 1000);

add(statusPane, BorderLayout.SOUTH);//增加状态栏

FontMetrics fm=FontDesignMetrics.getMetrics(myFont.getFont());//设置光标的大小

textPane.setFont(myFont.getFont());//设置行数面板的宽度

linePane.setPreferredSize(new Dimension(fm.stringWidth(MAX_LINE_NUM), 0));

addLineNum();

setBounds(200, 100, 800, 500); //设置窗口尺寸

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //关闭窗口时退出程序

setVisible(true); //设置窗口可视

}private voidaddLineNum(){//为textPane添加行号

String numText = String.valueOf(++lineNum);int tmpNum = MAX_LINE_NUM.length() - (int)(Math.log10(lineNum*1.0)+1);

String spaces= "";while(tmpNum > 0){

spaces+= " ";--tmpNum;

}

JLabel lineLabel= new JLabel(numText.replaceAll("(\\d+)", spaces+"$1"), JLabel.RIGHT);

lineLabel.setForeground(Color.GRAY);

lineLabel.setFont(myFont.getFont());

linePane.add(lineLabel);

linePane.updateUI();

}private JMenuBar createJMenuBar(Action[] actions) { //创建菜单栏

JMenuBar menubar = new JMenuBar(); //实例化菜单栏

JMenu menuFile = new JMenu("文件"); //实例化菜单

JMenu menuEdit = new JMenu("编辑");

JMenu menuAbout= new JMenu("帮助");

menuFile.add(new JMenuItem(actions[0])); //增加新菜单项

menuFile.add(new JMenuItem(actions[1]));

menuFile.add(new JMenuItem(actions[2]));

menuFile.add(new JMenuItem(actions[7]));

menuEdit.add(new JMenuItem(actions[3]));

menuEdit.add(new JMenuItem(actions[4]));

menuEdit.add(new JMenuItem(actions[5]));

menuAbout.add(new JMenuItem(actions[6]));

menubar.add(menuFile);//增加菜单

menubar.add(menuEdit);

menubar.add(menuAbout);return menubar; //返回菜单栏

}private JToolBar createJToolBar(Action[] actions) { //创建工具条

JToolBar toolBar = new JToolBar(); //实例化工具条

for (int i = 0; i < actions.length; i++) {

JButton bt= new JButton(actions[i]); //实例化新的按钮

bt.setRequestFocusEnabled(false); //设置不需要焦点

toolBar.add(bt); //增加按钮到工具栏

}return toolBar; //返回工具栏

}class NewFontStyle extendsAbstractAction{publicNewFontStyle() {super("字体");

}

@Overridepublic voidactionPerformed(ActionEvent e) {

JFontChooser one= newJFontChooser(myFont);

MyFont tmpFont= one.showDialog(null, "字体选择器", textPane.getLocationOnScreen().x, textPane.getLocationOnScreen().y);if(tmpFont == null) return;

myFont=tmpFont;//重新设置 textPane的字体，改变光标的大小

textPane.setFont(myFont.getFont());

FontMetrics fm=FontDesignMetrics.getMetrics(myFont.getFont());//重新设置数字行数面板的宽度

linePane.setPreferredSize(new Dimension(fm.stringWidth(MAX_LINE_NUM), 0));//重新设置行号的字体

for(int i=0; i < linePane.getComponentCount(); ++i)

linePane.getComponent(i).setFont(myFont.getFont());

StyledDocument doc=textPane.getStyledDocument();

SimpleAttributeSet wordAttr= newSimpleAttributeSet();

DecorateKeyWords.decorateStyleConstants(wordAttr, myFont.getFont());

doc.setCharacterAttributes(0, doc.getLength(), wordAttr, false);

}

}class NewAction extends AbstractAction { //新建文件命令

publicNewAction() {super("新建");

}public voidactionPerformed(ActionEvent e) {

textPane.setDocument(new DefaultStyledDocument()); //清空文档

while(linePane.getComponentCount() > 1)

linePane.remove(linePane.getComponent(linePane.getComponentCount()-1));

linePane.updateUI();

lineNum= 1;

initTextPaneDocument();

}

}class OpenAction extends AbstractAction { //打开文件命令

publicOpenAction() {super("打开");

}public voidactionPerformed(ActionEvent e) {int i = filechooser.showOpenDialog(EditorDemo.this); //显示打开文件对话框

if (i == JFileChooser.APPROVE_OPTION) { //点击对话框中打开选项

File f = filechooser.getSelectedFile(); //得到选择的文件

try{

InputStream is= new FileInputStream(f); //得到文件输入流

textPane.read(is, "d"); //读入文件到文本窗格

is.close();

is= newFileInputStream(f);

LineNumberReader lnr= new LineNumberReader(newInputStreamReader(is));

lnr.skip(Long.MAX_VALUE);int newLineNum = lnr.getLineNumber()+1;

lnr.close();if(lineNum

addLineNum();

}else{while(lineNum > newLineNum && lineNum > 1){

linePane.remove(linePane.getComponentCount()-1);--lineNum;

}

linePane.updateUI();

}

}catch(Exception ex) {

ex.printStackTrace();//输出出错信息

}

}

DecorateKeyWords.decorateKeyWords(textPane, myFont);

initTextPaneDocument();

}

}class SaveAction extends AbstractAction { //保存命令

publicSaveAction() {super("保存");

}public voidactionPerformed(ActionEvent e) {int i = filechooser.showSaveDialog(EditorDemo.this); //显示保存文件对话框

if (i == JFileChooser.APPROVE_OPTION) { //点击对话框中保存按钮

File f = filechooser.getSelectedFile(); //得到选择的文件

try{

FileOutputStream out= new FileOutputStream(f); //得到文件输出流

out.write(textPane.getText().getBytes()); //写出文件

} catch(Exception ex) {

ex.printStackTrace();//输出出错信息

}

}

}

}class ExitAction extends AbstractAction { //退出命令

publicExitAction() {super("退出");

}public voidactionPerformed(ActionEvent e) {

System.exit(0); //退出程序

}

}class CutAction extends AbstractAction { //剪切命令

publicCutAction() {super("剪切");

}public voidactionPerformed(ActionEvent e) {

textPane.cut();//调用文本窗格的剪切命令

}

}class CopyAction extends AbstractAction { //拷贝命令

publicCopyAction() {super("拷贝");

}public voidactionPerformed(ActionEvent e) {

textPane.copy();//调用文本窗格的拷贝命令

}

}class PasteAction extends AbstractAction { //粘贴命令

publicPasteAction() {super("粘贴");

}public voidactionPerformed(ActionEvent e) {

textPane.paste();//调用文本窗格的粘贴命令

}

}class AboutAction extends AbstractAction { //关于选项命令

publicAboutAction() {super("关于");

}public voidactionPerformed(ActionEvent e) {

JOptionPane.showMessageDialog(EditorDemo.this, "简单的文本编辑器演示"); //显示软件信息

}

}public static voidmain(String[] args) {newEditorDemo();

}

}