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; } @Override public String toString() { return familyIndex + " " + sizeIndex + " " + styleIndex + " " + colorIndex + " " + font + " " + color; } }
(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LBL private JLabel lblStyle;//选择字型的LBL private JLabel lblSize;//选择字大小的LBL private JLabel lblColor;//选择Color的label private JTextField txtFont;//显示选择字体的TEXT private JTextField txtStyle;//显示选择字型的TEXT private JTextField txtSize;//显示选择字大小的TEXT private 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() { @Override public void windowClosing(WindowEvent e) { myfont = null; dialog.removeAll(); dialog.dispose(); dialog = null; } }); dialog.setVisible(true); return myfont; } }
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(); } }
(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; } }
(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() { @Override public void changedUpdate(DocumentEvent e) {} @Override public void insertUpdate(final DocumentEvent e) { new Thread(new Runnable() { @Override public void run() { DecorateKeyWords.decorateKeyWords(textPane, myFont); } }).start(); } @Override public void removeUpdate(DocumentEvent e) { new Thread(new Runnable() { @Override public 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() { @Override public 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() { @Override public 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() { @Override public void changedUpdate(DocumentEvent e) {} @Override public void insertUpdate(final DocumentEvent e) { new Thread(new Runnable() { @Override public void run() { DecorateKeyWords.decorateKeyWords(textPane, myFont); } }).start(); } @Override public void removeUpdate(DocumentEvent e) { new Thread(new Runnable() { @Override public 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() { @Override public void keyPressed(KeyEvent e) { super.keyPressed(e); if(e.getKeyCode() == KeyEvent.VK_ENTER) { //添加新的行号 addLineNum(); } } }); textPane.addCaretListener(new CaretListener() { @Override public 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(new TimerTask() { @Override public 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"); } @Override public 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(); } }