简单文本编辑器

一、前言

　　聚天地之灵气，集日月之精华！一个简单的java文本编辑器由此而生。毕设所需，很是无奈！

二、界面预览

    

三、实现思路

　　1.字体选择器的实现

　　(1).字体类

class MyFont{private Font font;private Color color;public Font getFont() {return font;}public void setFont(Font font) {this.font = font;}public Color getColor() {return color;}public void setColor(Color color) {this.color = color;}//字体名称索引private int familyIndex = -1;//字体大小索引private int sizeIndex = -1;//字体颜色索引private int colorIndex = -1;//字体风格索引private int styleIndex = -1;public int getFamilyIndex() {return familyIndex;}public int getSizeIndex() {return sizeIndex;}public int getColorIndex() {return colorIndex;}public int getStyleIndex() {return styleIndex;}public void setFamilyIndex(int familyIndex) {this.familyIndex = familyIndex;}public void setSizeIndex(int sizeIndex) {this.sizeIndex = sizeIndex;}public void setColorIndex(int colorIndex) {this.colorIndex = colorIndex;}public void setStyleIndex(int styleIndex) {this.styleIndex = styleIndex;}@Overridepublic String toString() {return familyIndex + " " + sizeIndex + " " + styleIndex + " " + colorIndex + " \n" +font + " " + color; }}
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　　(2).字体选择器

public class JFontChooser extends JPanel {//定义变量private String current_fontName = "宋体";//当前的字体名称,默认宋体.private int current_fontStyle = Font.PLAIN;//当前的字样,默认常规.private int current_fontSize = 9;//当前字体大小,默认9号.private Color current_color = Color.BLACK;//当前字色,默认黑色.private Component parent;//弹出dialog的父窗体.private JDialog dialog;//用于显示模态的窗体private MyFont myfont;//带有Color的字体.private JLabel lblFont;//选择字体的LBLprivate JLabel lblStyle;//选择字型的LBLprivate JLabel lblSize;//选择字大小的LBLprivate JLabel lblColor;//选择Color的labelprivate JTextField txtFont;//显示选择字体的TEXTprivate JTextField txtStyle;//显示选择字型的TEXTprivate JTextField txtSize;//显示选择字大小的TEXTprivate JList lstFont;//选择字体的列表.private JList lstStyle;//选择字型的列表.private JList lstSize;//选择字体大小的列表.private JComboBox cbColor;//选择Color的下拉框.private JButton ok, cancel;//"确定","取消"按钮.private JScrollPane spFont;private JScrollPane spSize;private JLabel lblShow;//显示效果的label.private JPanel showPan;//显示框.private Map sizeMap;//字号映射表.private Map colorMap;//字着色映射表.//定义变量_结束________________public JFontChooser(MyFont curFont) {//实例化变量lblFont = new JLabel("字体:");lblStyle = new JLabel("字型:");lblSize = new JLabel("大小:");lblColor = new JLabel("颜色:");lblShow = new JLabel("Sample Test!", JLabel.CENTER);txtFont = new JTextField("宋体");txtStyle = new JTextField("常规");txtSize = new JTextField("9");//取得当前环境可用字体.GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();String[] fontNames = ge.getAvailableFontFamilyNames();lstFont = new JList(fontNames);//字形.lstStyle = new JList(new String[]{"常规", "斜休", "粗休", "粗斜休"});//字号.String[] sizeStr = new String[]{"8", "9", "10", "11", "12", "14", "16", "18", "20", "22", "24", "26", "28", "36", "48", "72","初号", "小初", "一号", "小一", "二号", "小二", "三号", "小三", "四号", "小四", "五号", "小五", "六号", "小六", "七号", "八号"};int sizeVal[] = {8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 48, 72, 42, 36, 26, 24, 22, 18, 16, 15, 14, 12, 11, 9, 8, 7, 6, 5};sizeMap = new HashMap();for (int i = 0; i < sizeStr.length; ++i) {sizeMap.put(sizeStr[i], sizeVal[i]);}lstSize = new JList(sizeStr);spFont = new JScrollPane(lstFont);spSize = new JScrollPane(lstSize);String[] colorStr = new String[]{"黑色", "蓝色", "深灰", "灰色", "绿色", "浅灰", "洋红", "桔黄", "粉红", "红色", "白色", "黄色"};Color[] colorVal = new Color[]{Color.BLACK, Color.BLUE, Color.DARK_GRAY, Color.GRAY, Color.GREEN, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE, Color.PINK, Color.RED, Color.WHITE, Color.YELLOW};colorMap = new HashMap();for (int i = 0; i < colorStr.length; i++) {colorMap.put(colorStr[i], colorVal[i]);}cbColor = new JComboBox(colorStr);showPan = new JPanel();ok = new JButton("确定");cancel = new JButton("取消");//实例化变量_结束//布局控件this.setLayout(null);//不用布局管理器.     
        add(lblFont);lblFont.setBounds(12, 10, 30, 20);txtFont.setEditable(false);add(txtFont);txtFont.setBounds(10, 30, 155, 20);add(spFont);spFont.setBounds(10, 50, 155, 100);add(lblStyle);lblStyle.setBounds(175, 10, 30, 20);txtStyle.setEditable(false);add(txtStyle);txtStyle.setBounds(175, 30, 130, 20);lstStyle.setBorder(javax.swing.BorderFactory.createLineBorder(Color.gray));add(lstStyle);lstStyle.setBounds(175, 50, 130, 100);add(lblSize);lblSize.setBounds(320, 10, 30, 20);txtSize.setEditable(false);add(txtSize);txtSize.setBounds(320, 30, 60, 20);add(spSize);spSize.setBounds(320, 50, 60, 100);add(lblColor);lblColor.setBounds(13, 170, 30, 20);add(cbColor);cbColor.setBounds(10, 195, 130, 22);cbColor.setMaximumRowCount(5);showPan.setBorder(javax.swing.BorderFactory.createTitledBorder("示例"));add(showPan);showPan.setBounds(150, 170, 230, 100);showPan.setLayout(new BorderLayout());lblShow.setBackground(Color.white);showPan.add(lblShow);add(ok);ok.setBounds(10, 240, 60, 20);add(cancel);cancel.setBounds(80, 240, 60, 20);//布局控件_结束//事件lstFont.addListSelectionListener(new ListSelectionListener() {public void valueChanged(ListSelectionEvent e) {current_fontName = (String) lstFont.getSelectedValue();txtFont.setText(current_fontName);lblShow.setFont(new Font(current_fontName, current_fontStyle, current_fontSize));}});lstStyle.addListSelectionListener(new ListSelectionListener() {public void valueChanged(ListSelectionEvent e) {String value = (String) ((JList) e.getSource()).getSelectedValue();if (value.equals("常规")) {current_fontStyle = Font.PLAIN;}if (value.equals("斜休")) {current_fontStyle = Font.ITALIC;}if (value.equals("粗休")) {current_fontStyle = Font.BOLD;}if (value.equals("粗斜休")) {current_fontStyle = Font.BOLD | Font.ITALIC;}txtStyle.setText(value);lblShow.setFont(new Font(current_fontName, current_fontStyle, current_fontSize));}});lstSize.addListSelectionListener(new ListSelectionListener() {public void valueChanged(ListSelectionEvent e) {current_fontSize = (Integer) sizeMap.get(lstSize.getSelectedValue());txtSize.setText(String.valueOf(current_fontSize));lblShow.setFont(new Font(current_fontName, current_fontStyle, current_fontSize));}});cbColor.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {current_color = (Color) colorMap.get(cbColor.getSelectedItem());lblShow.setForeground(current_color);}});ok.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {myfont = new MyFont();myfont.setFont(new Font(current_fontName, current_fontStyle, current_fontSize));myfont.setColor(current_color);myfont.setColorIndex(cbColor.getSelectedIndex());myfont.setFamilyIndex(lstFont.getSelectedIndex());myfont.setSizeIndex(lstSize.getSelectedIndex());myfont.setStyleIndex(lstStyle.getSelectedIndex());dialog.dispose();dialog = null;}});cancel.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {myfont = null;dialog.dispose();dialog = null;}});//事件_结束if(curFont != null){if(curFont.getFamilyIndex() != -1) {lstFont.setSelectedIndex(curFont.getFamilyIndex());lstFont.ensureIndexIsVisible(curFont.getFamilyIndex());} else {lstFont.setSelectedValue("宋体", true);}lstSize.setSelectedIndex(curFont.getSizeIndex());lstSize.ensureIndexIsVisible(curFont.getSizeIndex());lstStyle.setSelectedIndex(curFont.getStyleIndex());lstStyle.ensureIndexIsVisible(curFont.getStyleIndex());cbColor.setSelectedIndex(curFont.getColorIndex());}}public MyFont showDialog(Frame parent, String title, int dx, int dy) {if(title == null)title = "Font";dialog = new JDialog(parent, title,true);dialog.add(this);dialog.setResizable(false);dialog.setBounds(dx, dy, 400, 310);dialog.addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent e) {myfont = null;dialog.removeAll();dialog.dispose();dialog = null;}});dialog.setVisible(true);return myfont;}
}
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　　2.编辑器的实现

　　(1).字符串样式修饰类

　　　　功能：主要是将JTextPane对应的Document的文本进行处理。使得不同类型的文本显示为不同的风格样式。由于这个编辑器是用来编辑java语言的，所以会对java中的关键字进行特殊的显示，使得关键字，注释，以及其他串的不同的显示。

class DecorateKeyWords{//java中的关键字private static final String KEYWORDS[]={"abstract","assert","boolen","break","byte","case","catch","char","class","const",  "continue","default","do","double","else","enum","extends","final","finally","float","for",  "if","implements","import","instanceof","int","interface","long","native","new","package",  "private","protected","public","return","short","static","strictfp","super","switch","synchrpnized",  "this","throw","throws","transient","try","void","volatile","while"};  // 准备关键字     private static HashSet<String> keywords = new HashSet<String>(); public static void decorateStyleConstants(SimpleAttributeSet attr, Font font){StyleConstants.setFontFamily(attr, font.getFamily());StyleConstants.setFontSize(attr, font.getSize());switch(font.getStyle()) {case Font.BOLD :StyleConstants.setBold(attr, true);break;case Font.ITALIC :StyleConstants.setItalic(attr, true);break;case Font.PLAIN :StyleConstants.setItalic(attr, false);StyleConstants.setBold(attr, false);break;case Font.BOLD | Font.ITALIC :StyleConstants.setItalic(attr, true);StyleConstants.setBold(attr, true);break;default :break;}}public static void decorateKeyWords(JTextPane tp, MyFont myFont) {  //初始化关键字for(int i = 0; i<KEYWORDS.length; i++)  keywords.add(KEYWORDS[i]);// 对所有关键词进行修饰颜色  String text = tp.getText().replaceAll("\\r", "");  StyledDocument doc = tp.getStyledDocument();  SimpleAttributeSet keyWordAttr = new SimpleAttributeSet();  StyleConstants.setForeground(keyWordAttr, Color.cyan);decorateStyleConstants(keyWordAttr, myFont.getFont());SimpleAttributeSet otherWordAttr = new SimpleAttributeSet();  StyleConstants.setForeground(otherWordAttr, myFont.getColor());decorateStyleConstants(otherWordAttr, myFont.getFont());ListIterator<WordNode> iterator1 = split(text, "\\s|\\{|\\}|\\(|\\)|\\<|\\>|\\.|\\n");  while (iterator1.hasNext()) {  WordNode wn = iterator1.next(); if (keywords.contains(wn.getWord())) { doc.setCharacterAttributes(wn.getLocation(), wn.getWord().length(), keyWordAttr, true);  } else {doc.setCharacterAttributes(wn.getLocation(), wn.getWord().length(), otherWordAttr, true);}}  // 对注释行进行修饰不同的颜色  SimpleAttributeSet annotationAttr = new SimpleAttributeSet();  StyleConstants.setForeground(annotationAttr, Color.green); decorateStyleConstants(annotationAttr, myFont.getFont());ListIterator<WordNode> iterator2 = split(text, "\\n");  boolean exegesis = false; // 是否加了/*的注释  while (iterator2.hasNext()) {  WordNode wn = iterator2.next();  if (wn.getWord().startsWith("//")) {  doc.setCharacterAttributes(wn.getLocation(), wn.getWord()  .length(), annotationAttr, true);  } else if (wn.getWord().startsWith("/*")  && wn.getWord().endsWith("*/")) {  doc.setCharacterAttributes(wn.getLocation(), wn.getWord()  .length(), annotationAttr, true);  } else if (wn.getWord().startsWith("/*")  && !wn.getWord().endsWith("*/")) {  exegesis = true;  doc.setCharacterAttributes(wn.getLocation(), wn.getWord()  .length(), annotationAttr, true);  } else if (!wn.getWord().startsWith("/*") && wn.getWord().endsWith("*/") && true == exegesis) {  doc.setCharacterAttributes(wn.getLocation(), wn.getWord()  .length(), annotationAttr, true);  exegesis = false;  } else if (true == exegesis) {  doc.setCharacterAttributes(wn.getLocation(), wn.getWord()  .length(), annotationAttr, true);  }  }  }  /**  * 按照指定的多个字符进行字符串分割，如‘ ’或‘,’等  * @param str   *            被分割的字符串  * @param regexs  *            要分割所需的符号  * @return 包含WordNodeList对象的iterator  */  private static ListIterator<WordNode> split(String str,String regex) {  Pattern p = Pattern.compile(regex);  Matcher m = p.matcher(str); List<WordNode> nodeList = new ArrayList();  int strStart = 0; // 分割单词的首位置  String s; // 分割的单词  WordNode wn; // StringNode节点  while (m.find()) {  s = str.substring(strStart, m.start());  if (!s.equals(new String())) {  wn = new WordNode(strStart, s);  nodeList.add(wn);  }  strStart = m.start() + 1;  }  s = str.substring(strStart, str.length());  wn = new WordNode(strStart, s);  nodeList.add(wn);  return nodeList.listIterator();  }  
}
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　　(2).串节点

　　　　功能：通过正则表达式，将JTextPane对应的Document的文本进行分割，记录每个分割串的起始位置，然后通过字符串修饰类(DecorateKeyWords)中的decorateStyleConstants方法根据每个分割串的起始位置对JTextPane对应的Document的文本进行不同风格样式的修饰。

class WordNode {  private int location;  private String word;  public WordNode(int location, String str) {  super();  this.location = location;  this.word = str;  }  public int getLocation() {  return location;  }  public String getWord() {  return word;  }  
}
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　　(3).编辑器类

　　　　功能：文件的新建，文件的保存，文件的编辑；确定JTextPane中光标的位置（行号和列号），显示行号，字体样式的选择，重新设置新字体样式。

　　　　通过DocumentListener可以监听文档的改变，删除和插入的时候，调用字体选择器对文档的内容重新设置样式，另外在文档删除的时候判断是否行数减少，如果是，则更新行号面板的显示。

textPane.getDocument().addDocumentListener(new DocumentListener() {@Overridepublic void changedUpdate(DocumentEvent e) {}@Overridepublic void insertUpdate(final DocumentEvent e) {new Thread(new Runnable() {@Overridepublic void run() {DecorateKeyWords.decorateKeyWords(textPane, myFont);}}).start();}@Overridepublic void removeUpdate(DocumentEvent e) {new Thread(new Runnable() {  @Overridepublic void run() {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.getComponentCount()) {--lineNum;linePane.remove(linePane.getComponentCount()-1);}linePane.updateUI();} catch (BadLocationException ex) {ex.printStackTrace();} finally {DecorateKeyWords.decorateKeyWords(textPane, myFont);}}}).start();}
}

　　通过CaretListener可以监听光标位置的变化，实时获得光标所在的行号和列号并显示出来。

textPane.addCaretListener(new CaretListener() {@Overridepublic void caretUpdate(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();}}});

　　通过KeyListener可以监听按键的操作，如果是回车键，那么为行号面板增加新的行号！

textPane.addKeyListener(new KeyAdapter() {@Overridepublic void keyPressed(KeyEvent e) {super.keyPressed(e);if(e.getKeyCode() == KeyEvent.VK_ENTER) {//添加新的行号
            addLineNum();}}});

 

　　编辑器全部代码如下

public class EditorDemo extends JFrame {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 void initTextPaneDocument(){textPane.getDocument().addDocumentListener(new DocumentListener() {@Overridepublic void changedUpdate(DocumentEvent e) {}@Overridepublic void insertUpdate(final DocumentEvent e) {new Thread(new Runnable() {@Overridepublic void run() {DecorateKeyWords.decorateKeyWords(textPane, myFont);}}).start();}@Overridepublic void removeUpdate(DocumentEvent e) {new Thread(new Runnable() {  @Overridepublic void run() {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.getComponentCount()) {--lineNum;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 = new MyFont();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
         {new NewAction(),new OpenAction(),new SaveAction(),new CutAction(),new CopyAction(),new PasteAction(),new NewFontStyle(),new AboutAction(),new ExitAction()};textPane.addKeyListener(new KeyAdapter() {@Overridepublic void keyPressed(KeyEvent e) {super.keyPressed(e);if(e.getKeyCode() == KeyEvent.VK_ENTER) {//添加新的行号
                    addLineNum();}}});textPane.addCaretListener(new CaretListener() {@Overridepublic void caretUpdate(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(new BorderLayout());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JscrollPaneJPanel 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(new TimerTask() {@Overridepublic void run() {Date now = new Date(); 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 void addLineNum(){//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 extends AbstractAction{public NewFontStyle() {super("字体");}@Overridepublic void actionPerformed(ActionEvent e) {JFontChooser one = new JFontChooser(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 = new SimpleAttributeSet(); DecorateKeyWords.decorateStyleConstants(wordAttr, myFont.getFont());doc.setCharacterAttributes(0, doc.getLength(), wordAttr, false);}}class NewAction extends AbstractAction { //新建文件命令public NewAction() {super("新建");}public void actionPerformed(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public OpenAction() {super("打开");}public void actionPerformed(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 = new FileInputStream(f);LineNumberReader lnr = new LineNumberReader(new InputStreamReader(is));lnr.skip(Long.MAX_VALUE);int newLineNum = lnr.getLineNumber()+1;lnr.close();if(lineNum < newLineNum){while(lineNum < newLineNum)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public SaveAction() {super("保存");}public void actionPerformed(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public ExitAction() {super("退出");}public void actionPerformed(ActionEvent e) {System.exit(0);  //退出程序
          }}class CutAction extends AbstractAction {  //剪切命令public CutAction() {super("剪切");}public void actionPerformed(ActionEvent e) {textPane.cut();  //调用文本窗格的剪切命令
          }}class CopyAction extends AbstractAction {  //拷贝命令public CopyAction() {super("拷贝");}public void actionPerformed(ActionEvent e) {textPane.copy();  //调用文本窗格的拷贝命令
         }}class PasteAction extends AbstractAction {  //粘贴命令public PasteAction() {super("粘贴");}public void actionPerformed(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public AboutAction() {super("关于");}public void actionPerformed(ActionEvent e) {JOptionPane.showMessageDialog(EditorDemo.this, "简单的文本编辑器演示"); //显示软件信息
         }}public static void main(String[] args) {new EditorDemo();}
}
View Code

 

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