此程式是在前面程式的基礎上增加響應事件的完整程式，為了不讓程式太長，我想將快捷鍵(右鍵彈出選單)的事件專門放在一個類裡面，但遇到了一個問題，發現不好將原來類EditorJFrame3裡的popupmenu和text成員變數引數傳遞到專門的事件類中，於是想出了一個解決辦法:重新構造一個類似JTextArea的JTextAreaMenu(繼承JTextArea)類，他比JTextArea類的功能更強大，有複製、黏貼、剪下、自動換行等新的功能。

      這個綜合程式實現了記事本檔案的開啟、儲存、另存為，文字域字型和顏色的設定，滑鼠右鍵實現的複製、貼上、剪下等詳細功能。美中不足的是，開啟的檔案在JTextArea中顯示時，若開啟的是txt檔案沒什麼問題，但若是其他檔案則會顯示亂碼。此問題我暫時還解決不了，忘高人指點！

      源程式：

import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.GraphicsEnvironment; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.InputEvent; import java.awt.event.KeyEvent; import java.io.File; import java.io.FileInputStream; import java.io.FileWriter; import java.io.IOException; import javax.swing.ButtonGroup; import javax.swing.ImageIcon; import javax.swing.JCheckBox; import javax.swing.JCheckBoxMenuItem; import javax.swing.JComboBox; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JOptionPane; import javax.swing.JRadioButton; import javax.swing.JRadioButtonMenuItem; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.JToolBar; import javax.swing.KeyStroke; import myjtextarea.JTextAreaMenu; public class EditorJFrame3 extends JFrame implements ActionListener{ private JComboBox combox_name,combox_size;//字型、字號組合框 private JCheckBox checkb_bold,checkb_italic;//粗體斜體複選框 JCheckBoxMenuItem bold,italic;//粗體、斜體複選選單項 private JRadioButton radiob_color[];//顏色單選按鈕 private JTextArea text; private Color color; private File file; public EditorJFrame3(){ super("文字編輯器");//預設BorderLayout佈局 Dimension dim = getToolkit().getScreenSize(); setBounds(dim.width/4,dim.height/4,dim.width/2,dim.height/2); setDefaultCloseOperation(EXIT_ON_CLOSE); text = new JTextAreaMenu("Welcome 歡迎"); add(new JScrollPane(text)); addmyMenu();//選單欄 addmyJToolbar();//工具欄 setVisible(true); } private void addmyMenu(){//選單欄部分 JMenuBar menubar = new JMenuBar();//選單欄 setJMenuBar(menubar); String menustr[] = {"檔案","編輯","幫助"}; JMenu menu[]=new JMenu[menustr.length];//選單 for(int i=0;i<menustr.length;i++){ menu[i] = new JMenu(menustr[i]); menubar.add(menu[i]); } JMenuItem open = new JMenuItem("開啟",new ImageIcon("images/open.jpg")); open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_MASK));//快捷鍵 menu[0].add(open);//選單項加入到選單"檔案"裡 open.addActionListener(this); JMenuItem save = new JMenuItem("儲存",new ImageIcon("images/open.jpg")); menu[0].add(save); save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK)); save.addActionListener(this); JMenuItem saveas = new JMenuItem("另存為"); saveas.addActionListener(this); menu[0].add(saveas); menu[0].addSeparator();//新增分割線 JMenuItem menuitem_exit = new JMenuItem("退出"); menu[0].add(menuitem_exit); menuitem_exit.addActionListener(this);////////// //註冊事件 JMenu menu_style = new JMenu("字形");//選單 bold = new JCheckBoxMenuItem("粗體"); bold.addActionListener(this); menu_style.add(bold);//複選框選單項加入到選單中 italic = new JCheckBoxMenuItem("斜體"); italic.addActionListener(this); menu_style.add(italic); menu[1].add(menu_style); JMenu menu_color = new JMenu("顏色");//選單 menu[1].add(menu_color); ButtonGroup buttongroup = new ButtonGroup();//按鈕組 String colorstr[]={"紅","綠","藍"}; JRadioButtonMenuItem rbmi_color[]=new JRadioButtonMenuItem[colorstr.length];//單選選單項 for(int i =0;i<colorstr.length;i++){ rbmi_color[i] = new JRadioButtonMenuItem(colorstr[i]); buttongroup.add(rbmi_color[i]);//單選選單項新增到按鈕組中 // menu_color.add(rbmi_color[i]);//單選選單項新增到選單中 } JMenuItem author = new JMenuItem("關於作者"); author.addActionListener(this); menu[2].add(author); } private void addmyJToolbar(){//工具欄部分 JToolBar toolbar=new JToolBar(); //建立工具欄，預設水平方向 add(toolbar,"North"); //工具欄新增到框架內容窗格北部 GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment(); String[] fontsName=ge.getAvailableFontFamilyNames(); //獲得系統字型 combox_name = new JComboBox(fontsName); //組合框顯示系統字型 combox_name.addActionListener(this);////////// //註冊事件 toolbar.add(combox_name);//字型組合框加到工具欄裡 //設定組合框的寬度260和高度30 combox_name.setMaximumSize(new Dimension(260,30)); String sizestr[]={"20","30","40","50","60","70"}; combox_size = new JComboBox(sizestr); //陣列加到字號組合框 //組合框預設不可編輯 combox_size.setEditable(true); //設定組合框可編輯 combox_size.addActionListener(this);////////// //註冊事件 combox_size.setMaximumSize(new Dimension(180,30)); toolbar.add(combox_size);//字型組合框加到工具欄裡 checkb_bold = new JCheckBox("粗體"); //字形複選框 toolbar.add(checkb_bold); checkb_bold.addActionListener(this);////////// //註冊事件 checkb_italic = new JCheckBox("斜體"); toolbar.add(checkb_italic); checkb_italic.addActionListener(this);////////// //註冊事件 String colorstr[]={"紅","綠","藍"}; ButtonGroup bgroup_color = new ButtonGroup(); //按鈕組 radiob_color = new JRadioButton[colorstr.length];//顏色單選按鈕陣列 for (int i=0; i<radiob_color.length; i++) { radiob_color[i]=new JRadioButton(colorstr[i]); //顏色單選按鈕 radiob_color[i].addActionListener(this);///////////每個單選項均要註冊事件 bgroup_color.add(radiob_color[i]); //單選按鈕新增到按鈕組 toolbar.add(radiob_color[i]); ////////單選按鈕新增到工具欄 } //radiob_color[0].setSelected(true); //設定單選按鈕的選中狀態 } public static void main(String[] args) { new EditorJFrame3(); } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() instanceof JMenuItem) //單擊選單項 { if(e.getActionCommand()=="開啟"){ open(); return; } if(e.getActionCommand()=="儲存"){ save(); return; } if(e.getActionCommand() == "另存為"){ saveas(); return; } if (e.getActionCommand()=="退出") if (JOptionPane.showConfirmDialog(this, "終止當前程式執行？")==0) System.exit(0); //單擊確認對話方塊中的“是”按鈕，結束程式執行 if(e.getActionCommand() == "關於作者"){ AboutAuthor aboutAuthor = new AboutAuthor(); aboutAuthor.setSize(375, 200); aboutAuthor.setLocation(340, 220); aboutAuthor.setVisible(true); } } if (e.getSource() instanceof JRadioButton) //選擇一個顏色單選框 { if (e.getSource()==radiob_color[0]) color = new Color(255,0,0); if (e.getSource()==radiob_color[1]) color = new Color(0,255,0); if (e.getSource()==radiob_color[2]) color = new Color(0,0,255); text.setForeground(color); //設定文字區顏色 } if (e.getSource() instanceof JComboBox || e.getSource() instanceof JCheckBox || e.getSource() == bold || e.getSource()==italic) { //組合框、複選框 int size=0; try { String fontname = (String)combox_name.getSelectedItem();//獲得字型名 size = Integer.parseInt((String)combox_size.getSelectedItem());//獲得字號 if (size<4 || size>120) //字號超出指定範圍時，丟擲異常物件 throw new Exception("SizeException"); Font font = text.getFont(); //獲得文字區的當前字型物件 int style = font.getStyle(); //獲得字形 if (e.getSource()==checkb_bold || e.getSource() == bold) //粗體 style = style ^ 1; //整數的位運算，異或^ if (e.getSource()==checkb_italic || e.getSource()==italic) //斜體 style = style ^ 2; text.setFont(new Font(fontname, style, size)); //設定文字區字型樣式、字號大小 } catch(NumberFormatException nfe) { JOptionPane.showMessageDialog(this, "/""+(String)combox_size.getSelectedItem()+"/" 不能轉換成整數，請重新輸入!"); } catch(Exception ex) { if (ex.getMessage()=="SizeException") //捕獲自己丟擲的異常物件 JOptionPane.showMessageDialog(this, size+" 字號不合適，請重新輸入!"); } finally{} } if (e.getSource()==combox_size) //單擊字號組合框 { //將新輸入的字號新增到組合框的下拉列表中，先要查詢，不新增重複值 String size = (String)combox_size.getSelectedItem();//獲得當前輸入資料 int i=0, n=combox_size.getItemCount(); //n獲得組合框的選項數 while (i<n && size.compareTo((String)combox_size.getItemAt(i))>=0) { //size與組合框的選項比較 if (size.compareTo((String)combox_size.getItemAt(i))==0) return ; //相同，不插入 i++; } combox_size.insertItemAt(size, i); //將size插入在組合框的第i項 } } private void open()//開啟檔案 { JFileChooser fc=new JFileChooser();//檔案選擇對話方塊 fc.showOpenDialog(this); file=fc.getSelectedFile();//選擇的檔案 try{ FileInputStream in=new FileInputStream(file);//檔案位元組輸入流 byte[] b=new byte[in.available()]; in.read(b); //text.setLineWrap(true);text已有該性質 text.setText(new String(b)); in.close(); } catch(Exception e){} } private void save(){ FileWriter out ; try { if(file == null){ file = new File("新建檔案.txt"); } out = new FileWriter(file); out.write(text.getText()); out.close(); } catch (IOException e) { // TODO: handle exception } } private void saveas() //檔案另存 { JFileChooser fc=new JFileChooser(); fc.showSaveDialog(this); File file=fc.getSelectedFile(); try{ FileWriter out=new FileWriter(file); out.write(text.getText()); out.close(); }catch(Exception e){} } } package myjtextarea; import java.awt.datatransfer.Clipboard; import java.awt.datatransfer.DataFlavor; import java.awt.datatransfer.Transferable; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.InputEvent; import java.awt.event.KeyEvent; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import javax.swing.JMenuItem; import javax.swing.JPopupMenu; import javax.swing.JTextArea; import javax.swing.KeyStroke; public class JTextAreaMenu extends JTextArea implements MouseListener , ActionListener{ private JPopupMenu popupmenu = null;//快捷選單 JMenuItem popmenuitem[]; public JTextAreaMenu(){ createComponents(); } public JTextAreaMenu(String str){ super(str); createComponents(); } private void createComponents(){ setLineWrap(true); //////自動換行 popupmenu = new JPopupMenu(); String menuitemstr[]={"複製","貼上","剪下"}; popmenuitem = new JMenuItem[menuitemstr.length]; for (int i=0; i<popmenuitem.length; i++) { popmenuitem[i] = new JMenuItem(menuitemstr[i]); //選單項 popupmenu.add(popmenuitem[i]); /////快捷選單項加入彈出選單 popmenuitem[i].addActionListener(this); } popmenuitem[0].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_MASK));//設定快捷鍵Ctrl+X popmenuitem[1].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_MASK));//設定快捷鍵Ctrl+C popmenuitem[2].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, InputEvent.CTRL_MASK));//設定快捷鍵Ctrl+V add(popupmenu); //彈出選單加到文字域元件中 this.addMouseListener(this); } @Override public void mouseClicked(MouseEvent e) { } @Override public void mouseEntered(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mouseExited(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mousePressed(MouseEvent e) { if (e.getButton() == MouseEvent.BUTTON3) { //單擊的是滑鼠右鍵 popmenuitem[0].setEnabled(isCanCopy()); //複製啟用與否 popmenuitem[1].setEnabled(isClipboardString()); //黏貼 popmenuitem[2].setEnabled(isCanCopy()); //剪下 popupmenu.show(this, e.getX(), e.getY()); //在滑鼠單擊處顯示快捷選單 } } @Override public void mouseReleased(MouseEvent e) { // TODO Auto-generated method stub } /** * 剪下板中是否有文字資料可供貼上 * * @return true為有文字資料 */ public boolean isClipboardString() { boolean b = false; Clipboard clipboard = this.getToolkit().getSystemClipboard(); Transferable content = clipboard.getContents(this); try { if (content.getTransferData(DataFlavor.stringFlavor) instanceof String) { b = true; } } catch (Exception e) { } return b; } /** * 文字元件中是否具備複製的條件 * * @return true為具備 */ public boolean isCanCopy() { boolean b = false; int start = this.getSelectionStart(); //返回選定文字的起始位置 int end = this.getSelectionEnd(); //返回選定文字的結束位置 if (start != end) b = true; //文字不為空返回true return b; } @Override public void actionPerformed(ActionEvent e) { String str = e.getActionCommand(); if (str.equals(popmenuitem[0].getText())) { // 複製 this.copy(); } else if (str.equals("貼上")) { // 貼上 this.paste(); } else if (str.equals(popmenuitem[2].getText())) { // 剪下 this.cut(); } } } import java.awt.BorderLayout; import java.awt.Color; import java.awt.Font; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class AboutAuthor extends JFrame{ private JLabel author; private JLabel pop,bottom; private JPanel jpanel; public AboutAuthor() { jpanel = new JPanel(); jpanel.setBackground(Color.blue);//背景色 author = new JLabel("作 者 ：餘 永 利"); author.setForeground(Color.white);//前景色 author.setFont(new Font("黑體", Font.PLAIN, 22));//設定字型 pop = new JLabel(new ImageIcon("images/copyright.gif")); bottom = new JLabel("學校：湖北工業大學"); bottom.setForeground(Color.white); bottom.setFont(new Font("黑體", Font.PLAIN, 22));//設定字型 jpanel.add(pop); jpanel.add(author); jpanel.add(bottom); setResizable(false);//禁止最大化 setTitle("關於作者"); add(jpanel); } }