用Java编写记事本

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用Java编写记事本

(一）简介

来自一大学的大一学生，小白上路第一次写博客，还有许多不足，请大家多多指出问题和看法！欢迎交流！代码最后有邮箱联系~

(二）记事本

实现了一些简单基础的功能，代码自认为还比较整洁（狗头），有在网上参考各路大神的代码，如有侵权请联系我删除~

话不多说，直接上代码！！！！！！！！！！！！！！！！！！ 

import Javax.swing.*; import javax.swing.event.MenuEvent; import javax.swing.event.MenuListener; import javax.swing.text.BadLocationException; import javax.swing.text.DefaultHighlighter; import javax.swing.text.Highlighter; import javax.swing.undo.UndoManager; import java.awt.*; import java.awt.event.*; import java.io.*; import java.URI; import java.text.SimpleDateFormat; import java.util.Calendar; public class Mytext extends JFrame implements ActionListener { JTextArea myTextArea; JScrollPane my; JMenuBar myMenuBar; JMenu file, edit, source, help; JMenuItem New, Open, Save, NewWindow, exit, SaveAS; JMenuItem Cut, Copy, Paste, Delete, Time, Brow, Find, Replace, AllSelectd, revoke; JMenuItem autoLine, FontSet; JMenuItem Edition,Author; Highlighter highlighter; UndoManager und; boolean flag = false; int cl = 1; public static void main(String[] args) { new Mytext(); } public Mytext() { myTextArea = new JTextArea(); my = new JScrollPane(myTextArea); myMenuBar = new JMenuBar(); file = new JMenu("文件(F)"); edit = new JMenu("编辑(E)"); source = new JMenu("格式(O)"); help = new JMenu("帮助(H)"); //设置ALT快捷键 file.setMnemonic('F'); edit.setMnemonic('E'); source.setMnemonic('O'); help.setMnemonic('H'); New = new JMenuItem("新建(N)"); New.setActionCommand("create"); New.addActionListener(this); New.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_N,InputEvent.CTRL_MASK)); Open = new JMenuItem("打开(O)"); Open.setActionCommand("open"); Open.addActionListener(this); Open.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_O,InputEvent.CTRL_MASK)); Save = new JMenuItem("保存(S)"); Save.setActionCommand("save"); Save.addActionListener(this); Save.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_S,InputEvent.CTRL_MASK)); NewWindow = new JMenuItem("新窗口(W)"); NewWindow.setActionCommand("new_window"); NewWindow.addActionListener(this); NewWindow.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_W,InputEvent.CTRL_MASK)); SaveAS = new JMenuItem("另存为(A)"); SaveAS.setActionCommand("SaveAs"); SaveAS.addActionListener(this); SaveAS.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_A,InputEvent.CTRL_MASK)); exit = new JMenuItem("退出(X)"); exit.setActionCommand("exit"); exit.addActionListener(this); exit.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_X,InputEvent.CTRL_MASK)); Cut = new JMenuItem("剪切(T)"); Cut.setActionCommand("cut"); Cut.addActionListener(this); Cut.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_T,InputEvent.CTRL_MASK)); Copy = new JMenuItem("复制(C)"); Copy.setActionCommand("copy"); Copy.addActionListener(this); Copy.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_C,InputEvent.CTRL_MASK)); Paste = new JMenuItem("粘贴(P)"); Paste.setActionCommand("paste"); Paste.addActionListener(this); Paste.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_P,InputEvent.CTRL_MASK)); Time = new JMenuItem("时间/日期(D)"); Time.setActionCommand("time"); Time.addActionListener(this); Time.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_D,InputEvent.CTRL_MASK)); Delete = new JMenuItem("删除(L)"); Delete.setActionCommand("delete"); Delete.addActionListener(this); Delete.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_L,InputEvent.CTRL_MASK)); Brow = new JMenuItem("使用百度搜索(E)"); Brow.setActionCommand("brow"); Brow.addActionListener(this); Brow.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_E,InputEvent.CTRL_MASK)); Find = new JMenuItem("查找(F)"); Find.setActionCommand("find"); Find.addActionListener(this); Find.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_F,InputEvent.CTRL_MASK)); Replace = new JMenuItem("替换(R)"); Replace.setActionCommand("replace"); Replace.addActionListener(this); Replace.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_R,InputEvent.CTRL_MASK)); AllSelectd = new JMenuItem("全选(Q)"); AllSelectd.setActionCommand("all_selected"); AllSelectd.addActionListener(this); AllSelectd.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_Q,InputEvent.CTRL_MASK)); revoke = new JMenuItem("撤销(Z)"); revoke.setActionCommand("revoke"); revoke.setAccelerator(KeyStroke.getKeyStroke((char)KeyEvent.VK_Z,InputEvent.CTRL_MASK)); autoLine = new JCheckBoxMenuItem("自动换行(W)"); autoLine.setActionCommand("autoLine"); autoLine.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_W,InputEvent.CTRL_MASK)); FontSet = new JMenuItem("字体(I)"); FontSet.setActionCommand("FontSet"); FontSet.addActionListener(this); FontSet.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.VK_I,InputEvent.CTRL_MASK)); Edition = new JMenuItem("版本"); Edition.setActionCommand("Edition"); Edition.addActionListener(this); Author = new JMenuItem("作者"); Author.setActionCommand("Author"); Author.addActionListener(this); myMenuBar.add(file); myMenuBar.add(edit); myMenuBar.add(source); myMenuBar.add(help); file.add(New); file.addSeparator(); file.add(Open); file.addSeparator(); file.add(Save); file.addSeparator(); file.add(NewWindow); file.addSeparator(); file.add(SaveAS); file.addSeparator(); file.add(exit); edit.add(Cut); edit.addSeparator(); edit.add(Copy); edit.addSeparator(); edit.add(Paste); edit.addSeparator(); edit.add(Delete); edit.addSeparator(); edit.add(Time); edit.addSeparator(); edit.add(Brow); edit.addSeparator(); edit.add(AllSelectd); edit.addSeparator(); edit.add(Find); edit.addSeparator(); edit.add(Replace); edit.addSeparator(); edit.add(revoke); source.add(autoLine); source.addSeparator(); source.add(FontSet); help.add(Edition); help.addSeparator(); help.add(Author); this.add(my); this.setTitle("记事本"); this.setIconImage(new ImageIcon("C:\\\\Users\\\\13513\\\\Pictures\\\\1707319142.jpeg").getImage()); this.setJMenuBar(myMenuBar); this.setSize(500, 500); this.setLocation(100, 200); this.setResizable(true); this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); this.setVisible(true); // 设置自动换行 autoLine.addActionListener(e -> { cl++; flag = cl % 2 == 0; myTextArea.setLineWrap(flag); }); und = new UndoManager();// 实现撤销功能 myTextArea.getDocument().addUndoableEditListener(und); revoke.addActionListener(e -> { if (und.canUndo()) und.undo(); }); setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); //置窗口是否可以关闭 edit.addMenuListener(new MenuListener() {//当选择编辑时判断可用性 @Override public void menuSelected(MenuEvent e) { checkMenuItemEnabled(); } @Override public void menuDeselected(MenuEvent e) { checkMenuItemEnabled(); } @Override public void menuCanceled(MenuEvent e) { checkMenuItemEnabled(); } }); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e){ checkFileIsSave(); } }); } //设置菜单项的可用性：剪切，复制，删除功能 public void checkMenuItemEnabled() { String selectText=myTextArea.getSelectedText(); if(selectText==null) { Cut.setEnabled(false); Copy.setEnabled(false); Delete.setEnabled(false); } else { Cut.setEnabled(true); Copy.setEnabled(true); Delete.setEnabled(true); } } public void checkFileIsSave(){ if(myTextArea.getText().equals("") || myTextArea==null){ this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); } else{ int exitChoose=JOptionPane.showConfirmDialog(this,"您的文件是否保存？","退出提示",JOptionPane.YES_NO_OPTION); if(exitChoose==JOptionPane.YES_OPTION) { saveFile(); this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); } else if(exitChoose==JOptionPane.NO_OPTION){ this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); } } }//关闭窗口时调用方法结束 public void saveFile() {//保存文件方法 JFileChooser jFileChooser = new JFileChooser(); jFileChooser.setDialogTitle("记事本"); jFileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);//设置模式为只可以选择 jFileChooser.showOpenDialog(null);//默认值 jFileChooser.setVisible(true); String abs = jFileChooser.getSelectedFile().getAbsolutePath(); FileWriter fw = null; BufferedWriter bw = null; File file = new File(abs); try { fw = new FileWriter(file); bw = new BufferedWriter(fw); String[] s = myTextArea.getText().split("\\n"); for (String value : s) { bw.write(value + "\\n"); bw.flush(); } } catch (Exception e) { e.printStackTrace(); } finally { try { assert bw != null; bw.close(); fw.close(); } catch (IOException e) { e.printStackTrace(); } } } public String readFile() throws IOException {//读取文件方法 FileReader fileReader = null; BufferedReader bufferedReader = null; JFileChooser jFileChooser = new JFileChooser(); jFileChooser.setDialogTitle("记事本"); jFileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);//设置模式为只可以选择 jFileChooser.showOpenDialog(null);//默认值 jFileChooser.setVisible(true); String abs = jFileChooser.getSelectedFile().getAbsolutePath(); try { fileReader = new FileReader(abs); bufferedReader = new BufferedReader(fileReader); String now; String all = ""; while ((now = bufferedReader.readLine()) != null) { all += now + "\\n"; return all; } } catch (Exception e) { e.printStackTrace(); } finally { try { assert bufferedReader != null; bufferedReader.close(); fileReader.close(); } catch (IOException e) { e.printStackTrace(); } } return null; } @Override // 所有监听事件 public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equals("create")) { // 新建 if (myTextArea.getText() == null || "".equals(myTextArea.getText())) { return; } else { int num = JOptionPane.showConfirmDialog(null, "你确定保存吗?", "记事本", JOptionPane.YES_NO_CANCEL_OPTION); if (num == 0) { saveFile(); this.dispose(); new Mytext(); } else if (num == 1) { this.dispose(); new Mytext(); } } } if (e.getActionCommand().equals("save")) {//保存 saveFile(); } if (e.getActionCommand().equals("open")) {//打开 if(myTextArea.getText() == null || "".equals(myTextArea.getText())) { try { myTextArea.append(readFile()); } catch (IOException ex) { ex.printStackTrace(); } }else { int num = JOptionPane.showConfirmDialog(null, "你是否要保存?", "保存提示", JOptionPane.YES_NO_CANCEL_OPTION); if (num == 0) { saveFile(); myTextArea.replaceRange("", 0, myTextArea.getText().length()); try { myTextArea.append(readFile()); } catch (IOException ex) { ex.printStackTrace(); } } else if (num == 1) { myTextArea.replaceRange("", 0, myTextArea.getText().length()); try { myTextArea.append(readFile()); } catch (IOException ex) { ex.printStackTrace(); } } } } if (e.getActionCommand().equals("exit")) {//退出 this.dispose(); } if (e.getActionCommand().equals("new_window")) {//新窗口 new Mytext(); } if (e.getActionCommand().equals("SaveAs")) {//另存为 saveFile(); } if (e.getActionCommand().equals("copy")) {//复制 myTextArea.copy(); } if (e.getActionCommand().equals("paste")) {//粘贴 myTextArea.paste(); } if (e.getActionCommand().equals("cut")) {//剪切 myTextArea.copy(); myTextArea.cut(); } if (e.getActionCommand().equals("all_selected")) {//全选 myTextArea.selectAll(); } if (e.getActionCommand().equals("FontSet")) {//设置字体 JDialog jDialog = new JDialog(this,"字体",false); JPanel jp = new JPanel(); JPanel jp2 = new JPanel(); JPanel jp3 = new JPanel(); jDialog.setLayout(new BorderLayout()); //字体面板和标签 JLabel label1 = new JLabel("字体："); GraphicsEnvironment eee = GraphicsEnvironment.getLocalGraphicsEnvironment(); String[] ziti = eee.getAvailableFontFamilyNames(); JComboBox<Object> cmb1 = new JComboBox<>(ziti); jp.add(label1); jp.add(cmb1); //字体面板和标签 JLabel label2 = new JLabel("字体大小："); String[] nm = {"8","9","10","11","12","14","16","18", "20", "24", "26","28","36","48","72"}; JComboBox<Object> cmb2 = new JComboBox<>(nm); jp2.add(label2); jp2.add(cmb2); JLabel label3 = new JLabel("字形"); String[] zixing = {"常规","粗体","倾斜","倾斜 粗体"}; JComboBox<Object> cmb3 = new JComboBox<>(zixing); jp2.add(label3); jp2.add(cmb3); //面板加入窗口 jDialog.add(jp, BorderLayout.NORTH); jDialog.add(jp2, BorderLayout.CENTER); // 按钮设置 JButton jButton = new JButton("确定"); JButton exit_jButton = new JButton("取消"); jButton.setSize(50, 20); jButton.setSize(50, 20); jp3.add(jButton); jp3.add(exit_jButton); jDialog.add(jp3, BorderLayout.SOUTH); jDialog.setBounds(400, 400, 300, 150); jDialog.setVisible(true); jDialog.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); // 按钮监听 jButton.addActionListener(e1 -> { int s1 = cmb1.getSelectedIndex();//返回字体和大小的索引 int s2 = cmb2.getSelectedIndex(); int s3 = cmb3.getSelectedIndex(); jDialog.add(jp, BorderLayout.WEST); jDialog.add(jp2, BorderLayout.EAST); String name = ziti[s1]; String num = nm[s2]; int x = Integer.parseInt(String.valueOf(num));//把num转化为int型 if(s3 == 0){ myTextArea.setFont(new Font(name, Font.PLAIN, x)); //设置文本域 }else if(s3 == 1){ myTextArea.setFont(new Font(name, Font.BOLD, x)); //设置文本域 }else if(s3 == 2){ myTextArea.setFont(new Font(name, Font.ITALIC, x)); //设置文本域 }else if(s3 == 3){ myTextArea.setFont(new Font(name, Font.BOLD+ Font.ITALIC, x)); //设置文本域 } }); exit_jButton.addActionListener(e16 -> jDialog.dispose()); } if (e.getActionCommand().equals("delete")) { myTextArea.replaceRange("", myTextArea.getSelectionStart(), myTextArea.getSelectionEnd()); } if (e.getActionCommand().equals("time")) { Calendar calendar = Calendar.getInstance(); SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm yyyy/MM/dd"); myTextArea.append(dateFormat.format(calendar.getTime())); } if (e.getActionCommand().equals("brow")) { String str = myTextArea.getSelectedText(); String web; if (str == null) { web = "www.baidu/?"; }else { web = "www.baidu/s?wd=" + str; } try { URI uri = new URI(web); Desktop.getDesktop().browse(uri); } catch(Exception ee){ ee.printStackTrace(); } } if (e.getActionCommand().equals("replace")) { JDialog replaceDialog=new JDialog(this,"替换",false);//false时允许其他窗口同时处于激活状态(即无模式) Container con=replaceDialog.getContentPane();//返回此对话框的contentPane对象 con.setLayout(new FlowLayout(FlowLayout.CENTER)); JLabel findContentLabel=new JLabel("查找内容"); JLabel replaceLabel=new JLabel("替换为"); JTextField findText=new JTextField(15); JTextField replaceText=new JTextField(15); JButton findNextButton=new JButton("查找下一个"); JButton replaceButton=new JButton("替换"); JButton replaceAllButton=new JButton("全部替换"); JButton cancel=new JButton("取消"); JCheckBox matchCheckBox=new JCheckBox("区分大小写"); JCheckBox circleButton = new JCheckBox("循环",true); JPanel panel1=new JPanel(); JPanel panel2=new JPanel(); JPanel panel3=new JPanel(); JPanel panel4=new JPanel(); panel4.setLayout(new GridLayout(2,1)); panel1.add(findContentLabel); panel1.add(findText); panel1.add(findNextButton); panel4.add(replaceButton); panel4.add(replaceAllButton); panel2.add(replaceLabel); panel2.add(replaceText); panel2.add(panel4); panel3.add(matchCheckBox); panel3.add(circleButton); panel3.add(cancel); con.add(panel1); con.add(panel2); con.add(panel3); replaceDialog.setSize(420,220); replaceDialog.setResizable(false);//不可调整大小 replaceDialog.setLocation(230,280); replaceDialog.setVisible(true); DefaultHighlighter.DefaultHighlightPainter p = new DefaultHighlighter.DefaultHighlightPainter(Color.blue); highlighter = myTextArea.getHighlighter(); replaceDialog.addComponentListener(new ComponentAdapter() { @Override public void componentHidden(ComponentEvent e) { highlighter.removeAllHighlights(); } }); cancel.addActionListener(e12 -> { highlighter.removeAllHighlights(); replaceDialog.dispose(); }); findNextButton.addActionListener(e3 -> { highlighter.removeAllHighlights(); int k; String str1,str2,str3,str4,strA,strB; str1=myTextArea.getText(); str2=findText.getText(); str3=str1.toUpperCase(); str4=str2.toUpperCase(); if(matchCheckBox.isSelected()){ strA=str1; strB=str2; }else{ strA=str3; strB=str4; }//都转成大写 if (circleButton.isSelected()) { // 循环按钮实现 if (myTextArea.getSelectedText() == null) k=strA.indexOf(strB,myTextArea.getCaretPosition()+1); else{ k=strA.indexOf(strB, myTextArea.getCaretPosition()-findText.getText().length()+1); } if(k==-1 &&(strA.contains(strB))) { k = strA.indexOf(strB); } if(k>-1){ myTextArea.setCaretPosition(k); try {//高光 highlighter.addHighlight(k, k+strB.length(), p); } catch (BadLocationException ex) { ex.printStackTrace(); } myTextArea.select(k,k+strB.length()); }else{ JOptionPane.showMessageDialog(null,"找不到查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE); } }else { //否则向下循环 if (myTextArea.getSelectedText() == null) k = strA.indexOf(strB, myTextArea.getCaretPosition() + 1); else k = strA.indexOf(strB, myTextArea.getCaretPosition() - findText.getText().length() + 1); if (k > -1) { myTextArea.setCaretPosition(k); try {//高光 highlighter.addHighlight(k, k+strB.length(), p); } catch (BadLocationException ex) { ex.printStackTrace(); } myTextArea.select(k, k + strB.length()); } else { JOptionPane.showMessageDialog(null, "找不到查找的内容！", "代替", JOptionPane.INFORMATION_MESSAGE); } } }); replaceButton.addActionListener(e99 -> { highlighter.removeAllHighlights(); int m = myTextArea.getSelectionStart(); if(replaceText.getText().length()==0 && myTextArea.getSelectedText() != null) myTextArea.replaceSelection(""); if(replaceText.getText().length()>0 && myTextArea.getSelectedText() !=null) { myTextArea.replaceSelection(replaceText.getText()); } myTextArea.setCaretPosition(m); }); replaceAllButton.addActionListener(e14 -> { highlighter.removeAllHighlights(); if (matchCheckBox.isSelected()) { if(replaceText.getText().length()>0) { String a = myTextArea.getText().replace(findText.getText(), replaceText.getText()); int txtAreaLength = myTextArea.getText().length(); myTextArea.replaceRange(a, 0, txtAreaLength); }else{ String a = myTextArea.getText().replace(findText.getText(),""); int txtAreaLength = myTextArea.getText().length(); myTextArea.replaceRange(a, 0, txtAreaLength); } } else { String str1, str2, str3, str4; str1 = myTextArea.getText(); str2 = findText.getText(); str3 = str1.toUpperCase(); str4 = str2.toUpperCase(); String str = str3; //第一种方法 int frontLength = 0; while (str.contains(str4)) { int index = str.indexOf(str4); myTextArea.replaceRange(replaceText.getText(),index+frontLength,index+frontLength+replaceText.getText().length()); frontLength += (index + str4.length()); str = str.substring(index + str4.length()); } } }); } if(e.getActionCommand().equals("find")){ JDialog findDialog=new JDialog(this,"查找",false);//false时允许其他窗口同时处于激活状态(即无模式) Container con=findDialog.getContentPane();//返回此对话框的contentPane对象 con.setLayout(new FlowLayout(FlowLayout.LEFT)); JLabel findContentLabel=new JLabel("查找内容："); JTextField findText=new JTextField(15); JButton findNextButton=new JButton("查找下一个"); JCheckBox matchCheckBox=new JCheckBox("区分大小写"); JCheckBox circleButton=new JCheckBox("循环"); ButtonGroup bGroup=new ButtonGroup(); JRadioButton upButton=new JRadioButton("向上",true); JRadioButton downButton=new JRadioButton("向下"); downButton.setSelected(true); bGroup.add(upButton); bGroup.add(downButton); JButton cancel=new JButton("取消"); JPanel panel1=new JPanel(); JPanel panel2=new JPanel(); JPanel panel3=new JPanel(); JPanel directionPanel=new JPanel(); directionPanel.setBorder(BorderFactory.createTitledBorder("方 向")); directionPanel.add(upButton); directionPanel.add(downButton); panel1.setLayout(new GridLayout(2,1)); panel1.add(findNextButton); panel1.add(cancel); panel2.add(findContentLabel); panel2.add(findText); panel2.add(panel1); panel3.add(matchCheckBox); panel3.add(circleButton); panel3.add(directionPanel); con.add(panel2); con.add(panel3); findDialog.setSize(410,180); findDialog.setResizable(false);//不可调整大小 findDialog.setLocation(230,280); findDialog.setVisible(true); DefaultHighlighter.DefaultHighlightPainter p = new DefaultHighlighter.DefaultHighlightPainter(Color.blue); highlighter = myTextArea.getHighlighter(); findDialog.addComponentListener(new ComponentAdapter() { @Override public void componentHidden(ComponentEvent e) { highlighter.removeAllHighlights(); } }); //取消按钮事件处理 cancel.addActionListener(e12 -> { highlighter.removeAllHighlights(); findDialog.dispose(); }); findNextButton.addActionListener(e13 -> { highlighter.removeAllHighlights(); String str1,str2,str3,str4,strA,strB; str1=myTextArea.getText(); str2=findText.getText(); str3=str1.toUpperCase(); str4=str2.toUpperCase(); if(matchCheckBox.isSelected()){ strA=str1; strB=str2; }else{ strA=str3; strB=str4; } if(upButton.isSelected()){ //向上开始 int k; if(myTextArea.getSelectedText()==null) k=strA.lastIndexOf(strB,myTextArea.getCaretPosition()); else k=strA.lastIndexOf(strB, myTextArea.getCaretPosition()-findText.getText().length()-1); if(k>-1){ myTextArea.setCaretPosition(k); try {//高光 highlighter.addHighlight(k, k+strB.length(), p); myTextArea.select(k,k+strB.length()); } catch (BadLocationException ex) { ex.printStackTrace(); } }else if(circleButton.isSelected()&& k==-1 &&(strA.contains(strB))){ k = strA.lastIndexOf(strB); if(k>-1){ myTextArea.setCaretPosition(k); // myTextArea.select(k,k+strB.length()); try {//高光 highlighter.addHighlight(k, k+strB.length(), p); myTextArea.select(k,k+strB.length()); } catch (BadLocationException ex) { ex.printStackTrace(); } }else{ myTextArea.setCaretPosition(0); String s = findText.getText(); String ss = "找不到" + s; JOptionPane.showMessageDialog(null,ss,"查找",JOptionPane.INFORMATION_MESSAGE); } } else{ myTextArea.setCaretPosition(0); String s = findText.getText(); String ss = "找不到" + s; JOptionPane.showMessageDialog(null,ss,"查找",JOptionPane.INFORMATION_MESSAGE); } } else if(downButton.isSelected()) { int k; if (myTextArea.getSelectedText() == null) { k = strA.indexOf(strB, myTextArea.getCaretPosition()); }else k = strA.indexOf(strB, myTextArea.getCaretPosition() - findText.getText().length() + 1); if (k > -1) { myTextArea.setCaretPosition(k); try {//高光 highlighter.addHighlight(k, k + strB.length(), p); myTextArea.select(k,k+strB.length()); } catch (BadLocationException ex) { ex.printStackTrace(); } }else if (circleButton.isSelected() && k == -1 && (strA.contains(strB))) { k = strA.indexOf(strB); if (k > -1) { myTextArea.setCaretPosition(k); // myTextArea.select(k,k+strB.length()); try {//高光 highlighter.addHighlight(k, k + strB.length(), p); myTextArea.select(k,k+strB.length()); } catch (BadLocationException ex) { ex.printStackTrace(); } } else { String s = findText.getText(); String ss = "找不到" + s; JOptionPane.showMessageDialog(null, ss, "查找", JOptionPane.INFORMATION_MESSAGE); } } else{ String s = findText.getText(); String ss = "找不到" + s; myTextArea.setCaretPosition(myTextArea.getText().length()); JOptionPane.showMessageDialog(null, ss, "查找", JOptionPane.INFORMATION_MESSAGE); } System.out.println(" "); } /* 可以不用管这部分 */ // }else if (circleButton.isSelected()) {// 选择循环 // if (myTextArea.getSelectedText() == null) // k=strA.indexOf(strB,myTextArea.getCaretPosition()+1); // else{ // k=strA.indexOf(strB, myTextArea.getCaretPosition()-findText.getText().length()+1); // } // if(k==-1 &&(strA.contains(strB))) { // k = strA.indexOf(strB); // } // if(k>-1){ // // myTextArea.setCaretPosition(k); // myTextArea.select(k,k+strB.length()); // try {//高光 // highlighter.addHighlight(k, k+strB.length(), p); // } catch (BadLocationException ex) { // ex.printStackTrace(); // } // }else{ // JOptionPane.showMessageDialog(null,"找不到查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE); // } // } }); } if(e.getActionCommand().equals("Edition")){ JOptionPane.showMessageDialog(null,"版本1.0\\n"+ "有问题和建议可以联系我o","版本3.0" ,JOptionPane.PLAIN_MESSAGE); } if(e.getActionCommand().equals("Author")){ JOptionPane.showMessageDialog(null, """ 积分安 联系邮箱： 2021132070@stu.cuit.edu""","作者",JOptionPane.PLAIN_MESSAGE); } } }

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更新2022.12.1

二代版本很早写出来但是一直没发布

有人问我要源码才想起来更新哈哈哈哈哈哈sorry，现在为记事本第二代，基本功能都实现了。

本文标签： 记事本java