java记事本课程设计源代码-JNotePadUI

java记事本课程 设计 领导形象设计圆作业设计ao工艺污水处理厂设计附属工程施工组织设计清扫机器人结构设计 源代码-JNotePadUI import java.awt.BorderLayout;import java.awt.Container; import java.awt.Font; import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.InputEvent;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import javax.swing.BorderFactory;import javax.swing.JFileChooser;import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JMenu; import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JOptionPane;import javax.swing.JPopupMenu;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.KeyStroke;import javax.swing.ScrollPaneConstants;import javax.swing.SwingConstants;public class JNotePadUI extends JFrame { private JMenuItem menuOpen; private JMenuItem menuSave; private JMenuItem menuSaveAs; private JMenuItem menuClose; private JMenu editMenu; private JMenuItem menuCut; private JMenuItem menuCopy; private JMenuItem menuPaste; private JMenuItem menuAbout; private JTextArea textArea; private JLabel stateBar; private JFileChooser fileChooser; private JPopupMenu popUpMenu; public JNotePadUI() { super("新建文本文件"); setUpUIComponent(); setUpEventListener(); setVisible(true); } private void setUpUIComponent() { setSize(640, 480); // 菜单单 JMenuBar menuBar = new JMenuBar(); // 单单置「文件」菜 JMenu fileMenu = new JMenu("文件"); menuOpen = new JMenuItem("打单"); // 快捷置单单单 menuOpen.setAccelerator( KeyStroke.getKeyStroke( KeyEvent.VK_O, InputEvent.CTRL_MASK)); menuSave = new JMenuItem("保存"); menuSave.setAccelerator( KeyStroke.getKeyStroke( KeyEvent.VK_S, InputEvent.CTRL_MASK)); menuSaveAs = new JMenuItem("另存单"); menuClose = new JMenuItem("单单"); menuClose.setAccelerator( KeyStroke.getKeyStroke( KeyEvent.VK_Q, InputEvent.CTRL_MASK)); fileMenu.add(menuOpen); fileMenu.addSeparator(); // 分隔单 fileMenu.add(menuSave); fileMenu.add(menuSaveAs); fileMenu.addSeparator(); // 分隔单 fileMenu.add(menuClose); // 单单单单单单 置「」菜 JMenu editMenu = new JMenu("单单"); menuCut = new JMenuItem("剪切"); menuCut.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_MASK)); menuCopy = new JMenuItem("单制"); menuCopy.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_MASK)); menuPaste = new JMenuItem("粘单"); menuPaste.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_V, InputEvent.CTRL_MASK)); editMenu.add(menuCut); editMenu.add(menuCopy); editMenu.add(menuPaste); // 单单单单单单 置「于」菜 JMenu aboutMenu = new JMenu("单于"); menuAbout = new JMenuItem("单于JNotePad"); aboutMenu.add(menuAbout); menuBar.add(fileMenu); menuBar.add(editMenu); menuBar.add(aboutMenu); setJMenuBar(menuBar); // 文字区域单单单单 textArea = new JTextArea(); textArea.setFont(new Font("宋体", Font.PLAIN, 16)); textArea.setLineWrap(true); JScrollPane panel = new JScrollPane(textArea, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER); Container contentPane = getContentPane(); contentPane.add(panel, BorderLayout.CENTER); // 状单单 stateBar = new JLabel("未修改"); stateBar.setHorizontalAlignment(SwingConstants.LEFT); stateBar.setBorder( BorderFactory.createEtchedBorder()); contentPane.add(stateBar, BorderLayout.SOUTH); popUpMenu = editMenu.getPopupMenu(); fileChooser = new JFileChooser(); } private void setUpEventListener() { // 按下窗口事件理单单单单单单单 addWindowListener( new WindowAdapter() { public void windowClosing(WindowEvent e) { closeFile(); } } ); // 菜单 - 打单 menuOpen.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { openFile(); } } ); // 菜单 - 保存 menuSave.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { saveFile(); } } ); // 菜单 - 另存单 menuSaveAs.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { saveFileAs(); } } ); // 菜单 - 单单文件 menuClose.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { closeFile(); } } ); // 菜单 - 剪切 menuCut.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { cut(); } } ); // 菜单 - 单制 menuCopy.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { copy(); } } ); // 菜单 - 粘单 menuPaste.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { paste(); } } ); // 菜单 - 单于 menuAbout.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { // 单单单单示框 JOptionPane.showOptionDialog(null, null, "程序名称:\n JNotePad \n" + "程序单单:\n \n" + "单介:\n 一个的文字器单单单单单单单单\n", JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE, null, null, null); } } ); // 单单单单单单区事件 textArea.addKeyListener( new KeyAdapter() { public void keyTyped(KeyEvent e) { processTextArea(); } } ); // 单单单单单区鼠事件 textArea.addMouseListener( new MouseAdapter() { public void mouseReleased(MouseEvent e) { if(e.getButton() == MouseEvent.BUTTON3) popUpMenu.show(editMenu, e.getX(), e.getY()); } public void mouseClicked(MouseEvent e) { if(e.getButton() == MouseEvent.BUTTON1) popUpMenu.setVisible(false); } } ); } private void openFile() { if(isCurrentFileSaved()) { // 文件是否保存状单单单单单 open(); // 打单 } else { // 单单单单示框 int option = JOptionPane.showConfirmDialog( null, "文件已修改,是否保存,", "保存文件,", JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE, null); switch(option) { // 确文件保存单单单单单 case JOptionPane.YES_OPTION: saveFile(); // 保存文件 break; // 放弃文件保存 case JOptionPane.NO_OPTION: open(); break; } } } private boolean isCurrentFileSaved() { if(stateBar.getText().equals("未修改")) { return false; } else { return true; } } private void open() { // fileChooser 是 JFileChooser 的例单单 // 单单单单单单单示文件取的框 int option = fileChooser.showDialog(null, null); // 使用者按下确单单 if(option == JFileChooser.APPROVE_OPTION) { try { // 单单单单单单启取的文件 BufferedReader buf = new BufferedReader( new FileReader( fileChooser.getSelectedFile())); // 单单单定文件 setTitle(fileChooser.getSelectedFile().toString()); // 清除前一次文件 textArea.setText(""); // 单单单定状 stateBar.setText("未修改"); // 取得系相依的行字符单单单单单单单单 String lineSeparator = System.getProperty("line.separator"); // 单单单单取文件并附加至文字区 String text; while((text = buf.readLine()) != null) { textArea.append(text); textArea.append(lineSeparator); } buf.close(); } catch(IOException e) { JOptionPane.showMessageDialog(null, e.toString(), "单单启文件失", JOptionPane.ERROR_MESSAGE); } } } private void saveFile() { // 从取得文件名称单单单单单单单单单 File file = new File(getTitle()); // 若指定的文件不存在 if(!file.exists()) { // 单单行另存 saveFileAs(); } else { try { // 单启指定的文件 BufferedWriter buf = new BufferedWriter( new FileWriter(file)); // 将文字区的文字写入文件单单单单单单单单单单 buf.write(textArea.getText()); buf.close(); // 单单单单单单单定状未修改 stateBar.setText("未修改"); } catch(IOException e) { JOptionPane.showMessageDialog(null, e.toString(), "写入文件失", JOptionPane.ERROR_MESSAGE);单 } } } private void saveFileAs() { // 单单单单示文件框 int option = fileChooser.showSaveDialog(null); // 如果确取文件单单单单单 if(option == JFileChooser.APPROVE_OPTION) { // 取得的文件单单单单单 File file = fileChooser.getSelectedFile(); // 在上定文件名称单单单单单单单单单单 setTitle(file.toString()); try { // 建立文件 file.createNewFile(); // 单行文件保存 saveFile(); } catch(IOException e) { JOptionPane.showMessageDialog(null, e.toString(), "无法建立新文件", JOptionPane.ERROR_MESSAGE); } } } private void closeFile() { // 是否已保存文件 if(isCurrentFileSaved()) { // 单单单单单单单单单单放窗口源,而后程序 dispose(); } else { int option = JOptionPane.showConfirmDialog( null, "文件已修改,是否保存,", "保存文件,", JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE, null); switch(option) { case JOptionPane.YES_OPTION: saveFile(); break; case JOptionPane.NO_OPTION: dispose(); } } } private void cut() { textArea.cut(); stateBar.setText("已修改"); popUpMenu.setVisible(false); } private void copy() { textArea.copy(); popUpMenu.setVisible(false); } private void paste() { textArea.paste(); stateBar.setText("已修改"); popUpMenu.setVisible(false); } private void processTextArea() { stateBar.setText("已修改"); } public static void main(String[] args) { new JNotePadUI(); } }