一、前言

　　聚天地之靈氣，集日月之精華！一個簡單的java文本編輯器由此而生。畢設所需，很是無奈！

二、界面預覽

?? ?

三、實現思路

　　1.字體選擇器的實現

　　(1).字體類

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;}//字體名稱索引private int familyIndex = -1;//字體大小索引private int sizeIndex = -1;//字體顏色索引private int colorIndex = -1;//字體風格索引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; }} View Code

　　(2).字體選擇器

public class JFontChooser extends JPanel {//定義變量private String current_fontName = "宋體";//當前的字體名稱,默認宋體.private int current_fontStyle = Font.PLAIN;//當前的字樣,默認常規.private int current_fontSize = 9;//當前字體大小,默認9號.private Color current_color = Color.BLACK;//當前字色,默認黑色.private Component parent;//彈出dialog的父窗體.private JDialog dialog;//用于顯示模態的窗體private MyFont myfont;//帶有Color的字體.private JLabel lblFont;//選擇字體的LBLprivate JLabel lblStyle;//選擇字型的LBLprivate JLabel lblSize;//選擇字大小的LBLprivate JLabel lblColor;//選擇Color的labelprivate JTextField txtFont;//顯示選擇字體的TEXTprivate JTextField txtStyle;//顯示選擇字型的TEXTprivate JTextField txtSize;//顯示選擇字大小的TEXTprivate JList lstFont;//選擇字體的列表.private JList lstStyle;//選擇字型的列表.private JList lstSize;//選擇字體大小的列表.private JComboBox cbColor;//選擇Color的下拉框.private JButton ok, cancel;//"確定","取消"按鈕.private JScrollPane spFont;private JScrollPane spSize;private JLabel lblShow;//顯示效果的label.private JPanel showPan;//顯示框.private Map sizeMap;//字號映射表.private Map colorMap;//字著色映射表.//定義變量_結束________________public JFontChooser(MyFont curFont) {//實例化變量lblFont = new JLabel("字體:");lblStyle = new JLabel("字型:");lblSize = new JLabel("大小:");lblColor = new JLabel("顏色:");lblShow = new JLabel("Sample Test!", JLabel.CENTER);txtFont = new JTextField("宋體");txtStyle = new JTextField("常規");txtSize = new JTextField("9");//取得當前環境可用字體.GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();String[] fontNames = ge.getAvailableFontFamilyNames();lstFont = new JList(fontNames);//字形.lstStyle = new JList(new String[]{"常規", "斜休", "粗休", "粗斜休"});//字號.String[] sizeStr = new String[]{"8", "9", "10", "11", "12", "14", "16", "18", "20", "22", "24", "26", "28", "36", "48", "72","初號", "小初", "一號", "小一", "二號", "小二", "三號", "小三", "四號", "小四", "五號", "小五", "六號", "小六", "七號", "八號"};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", "藍色", "深灰", "灰色", "綠色", "淺灰", "洋紅", "桔黃", "粉紅", "紅色", "白色", "黃色"};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("確定");cancel = new JButton("取消");//實例化變量_結束//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_結束//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("常規")) {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_結束if(curFont != null){if(curFont.getFamilyIndex() != -1) {lstFont.setSelectedIndex(curFont.getFamilyIndex());lstFont.ensureIndexIsVisible(curFont.getFamilyIndex());} else {lstFont.setSelectedValue("宋體", 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;} } View Code

　　2.編輯器的實現

　　(1).字符串樣式修飾類

　　　　功能：主要是將JTextPane對應的Document的文本進行處理。使得不同類型的文本顯示為不同的風格樣式。由于這個編輯器是用來編輯java語言的，所以會對java中的關鍵字進行特殊的顯示，使得關鍵字，注釋，以及其他串的不同的顯示。

class DecorateKeyWords{//java中的關鍵字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"}; // 準備關鍵字 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) { //初始化關鍵字for(int i = 0; i<KEYWORDS.length; i++) keywords.add(KEYWORDS[i]);// 對所有關鍵詞進行修飾顏色 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);}} // 對注釋行進行修飾不同的顏色 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/*的注釋 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); } } } /** * 按照指定的多個字符進行字符串分割，如‘ ’或‘,’等 * @param str * 被分割的字符串 * @param regexs * 要分割所需的符號 * @return 包含WordNodeList對象的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; // 分割單詞的首位置 String s; // 分割的單詞 WordNode wn; // StringNode節點 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(); } } View Code

　　(2).串節點

　　　　功能：通過正則表達式，將JTextPane對應的Document的文本進行分割，記錄每個分割串的起始位置，然后通過字符串修飾類(DecorateKeyWords)中的decorateStyleConstants方法根據每個分割串的起始位置對JTextPane對應的Document的文本進行不同風格樣式的修飾。

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; } } View Code

　　(3).編輯器類

　　　　功能：文件的新建，文件的保存，文件的編輯；確定JTextPane中光標的位置（行號和列號），顯示行號，字體樣式的選擇，重新設置新字體樣式。

　　　　通過DocumentListener可以監聽文檔的改變，刪除和插入的時候，調用字體選擇器對文檔的內容重新設置樣式，另外在文檔刪除的時候判斷是否行數減少，如果是，則更新行號面板的顯示。

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()){//計算行數++lineRow;}while(lineRow < linePane.getComponentCount()) {--lineNum;linePane.remove(linePane.getComponentCount()-1);}linePane.updateUI();} catch (BadLocationException ex) {ex.printStackTrace();} finally {DecorateKeyWords.decorateKeyWords(textPane, myFont);}}}).start();} }

　　通過CaretListener可以監聽光標位置的變化，實時獲得光標所在的行號和列號并顯示出來。

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;//記錄文本中最后一行的開始的位置 while(matcher.find()){//計算行數++lineRow;lastLineBeginPos = matcher.start();//得到下一行光標所在的位置（根據上一行的換行符） }int lineCol = e.getDot() - lastLineBeginPos;//顯示行號和列號caretStatusBar.setText("光標 " + lineRow + " : " + lineCol);} catch (BadLocationException ey) {ey.printStackTrace();}}});

　　通過KeyListener可以監聽按鍵的操作，如果是回車鍵，那么為行號面板增加新的行號！

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

?

　　編輯器全部代碼如下

public class EditorDemo extends JFrame {public static final String MAX_LINE_NUM = "9999";private JTextPane textPane = new JTextPane(); //文本窗格，編輯窗口private JLabel timeStatusBar = new JLabel(); //時間狀態欄private JLabel caretStatusBar = new JLabel(); //光標位置狀態欄private JFileChooser filechooser = new JFileChooser(); //文件選擇器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()){//計算行數++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() { //構造函數super("簡單的文本編輯器"); //調用父類構造函數//初始字體myFont = new MyFont();myFont.setColor(Color.black);myFont.setFont(new Font("宋體", Font.PLAIN, 24));myFont.setSizeIndex(19);myFont.setStyleIndex(0);myFont.setColorIndex(0);Action[] actions = //Action數組,各種操作命令 {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) {//添加新的行號 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;//記錄文本中最后一行的開始的位置 while(matcher.find()){//計算行數++lineRow;lastLineBeginPos = matcher.start();//得到下一行光標所在的位置（根據上一行的換行符） }int lineCol = e.getDot() - lastLineBeginPos;//顯示行號和列號caretStatusBar.setText("光標 " + lineRow + " : " + lineCol);} catch (BadLocationException ey) {ey.printStackTrace();}}});initTextPaneDocument();setJMenuBar(createJMenuBar(actions)); //設置菜單欄add(createJToolBar(actions), BorderLayout.NORTH); //增加工具欄JPanel textBackPanel = new JPanel(new BorderLayout());textBackPanel.add(linePane, BorderLayout.WEST);//增加行號面板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);//初始化光標位置caretStatusBar.setText("光標 1 : 1");//初始化系統時間顯示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); //增加狀態欄 FontMetrics fm = FontDesignMetrics.getMetrics(myFont.getFont());//設置光標的大小 textPane.setFont(myFont.getFont());//設置行數面板的寬度linePane.setPreferredSize(new Dimension(fm.stringWidth(MAX_LINE_NUM), 0));addLineNum();setBounds(200, 100, 800, 500); //設置窗口尺寸setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //關閉窗口時退出程序setVisible(true); //設置窗口可視 }private void addLineNum(){//為textPane添加行號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) { //創建菜單欄JMenuBar menubar = new JMenuBar(); //實例化菜單欄JMenu menuFile = new JMenu("文件"); //實例化菜單JMenu menuEdit = new JMenu("編輯");JMenu menuAbout = new JMenu("幫助");menuFile.add(new JMenuItem(actions[0])); //增加新菜單項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); //增加菜單 menubar.add(menuEdit);menubar.add(menuAbout);return menubar; //返回菜單欄 }private JToolBar createJToolBar(Action[] actions) { //創建工具條JToolBar toolBar = new JToolBar(); //實例化工具條for (int i = 0; i < actions.length; i++) {JButton bt = new JButton(actions[i]); //實例化新的按鈕bt.setRequestFocusEnabled(false); //設置不需要焦點toolBar.add(bt); //增加按鈕到工具欄 }return toolBar; //返回工具欄 }class NewFontStyle extends AbstractAction{public NewFontStyle() {super("字體");}@Overridepublic void actionPerformed(ActionEvent e) {JFontChooser one = new JFontChooser(myFont);MyFont tmpFont = one.showDialog(null, "字體選擇器", textPane.getLocationOnScreen().x, textPane.getLocationOnScreen().y); if(tmpFont == null) return;myFont = tmpFont;//重新設置 textPane的字體，改變光標的大小 textPane.setFont(myFont.getFont());FontMetrics fm = FontDesignMetrics.getMetrics(myFont.getFont());//重新設置數字行數面板的寬度linePane.setPreferredSize(new Dimension(fm.stringWidth(MAX_LINE_NUM), 0));//重新設置行號的字體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()); //清空文檔while(linePane.getComponentCount() > 1)linePane.remove(linePane.getComponent(linePane.getComponentCount()-1));linePane.updateUI();lineNum = 1;initTextPaneDocument();}}class OpenAction extends AbstractAction { //打開文件命令public OpenAction() {super("打開");}public void actionPerformed(ActionEvent e) {int i = filechooser.showOpenDialog(EditorDemo.this); //顯示打開文件對話框if (i == JFileChooser.APPROVE_OPTION) { //點擊對話框中打開選項File f = filechooser.getSelectedFile(); //得到選擇的文件try {InputStream is = new FileInputStream(f); //得到文件輸入流textPane.read(is, "d"); //讀入文件到文本窗格 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(); //輸出出錯信息 }}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); //顯示保存文件對話框if (i == JFileChooser.APPROVE_OPTION) { //點擊對話框中保存按鈕File f = filechooser.getSelectedFile(); //得到選擇的文件try {FileOutputStream out = new FileOutputStream(f); //得到文件輸出流out.write(textPane.getText().getBytes()); //寫出文件 } catch (Exception ex) {ex.printStackTrace(); //輸出出錯信息 }}}}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(); //調用文本窗格的剪切命令 }}class CopyAction extends AbstractAction { //拷貝命令public CopyAction() {super("拷貝");}public void actionPerformed(ActionEvent e) {textPane.copy(); //調用文本窗格的拷貝命令 }}class PasteAction extends AbstractAction { //粘貼命令public PasteAction() {super("粘貼");}public void actionPerformed(ActionEvent e) {textPane.paste(); //調用文本窗格的粘貼命令 }}class AboutAction extends AbstractAction { //關于選項命令public AboutAction() {super("關于");}public void actionPerformed(ActionEvent e) {JOptionPane.showMessageDialog(EditorDemo.this, "簡單的文本編輯器演示"); //顯示軟件信息 }}public static void main(String[] args) {new EditorDemo();} } View Code

?

轉載于:https://www.cnblogs.com/hujunzheng/p/5232125.html

總結

以上是生活随笔為你收集整理的简单文本编辑器的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。