Java编程之图形化写字板

问题描述：请使用Java编程语言实现图形化的写字板，能够完成写字寄存和擦除的功能。

程序源码：

import java.awt.*;
import java.awt.event.*;
import java.awt.datatransfer.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;public class JNotePadUI extends JPanel
{// 变量定义JTextArea jta = new JTextArea("", 24, 40);JScrollPane jsp = new JScrollPane(jta);// 菜单条JMenuBar jmb = new JMenuBar();JMenu file = new JMenu("文件(F)", true);JMenu edit = new JMenu("编辑(E)", true);JMenu help = new JMenu("帮助(H)", true);// 工具条JToolBar toolBar = new JToolBar();// 菜单内容JMenuItem jmi;// 实例化剪切板Clipboard clipbd = getToolkit().getSystemClipboard();String text = "";// 构造函数public JNotePadUI() {class newL implements ActionListener {public void actionPerformed(ActionEvent e) {jta.setDocument(new PlainDocument());}}// 打开功能class openL implements ActionListener {public void actionPerformed(ActionEvent e) {JFileChooser fc = new JFileChooser();int returnVal = fc.showDialog(JNotePadUI.this, "打开");if (returnVal == JFileChooser.APPROVE_OPTION) {String file = fc.getSelectedFile().getPath();if (file == null) {return;}// 读取文件try {Reader in = new FileReader(file);char[] buff = new char[4096];int nch;while ((nch = in.read(buff, 0, buff.length)) != -1) {jta.setDocument(new PlainDocument());jta.append(new String(buff, 0, nch));}} catch (IOException io) {System.err.println("IOException: " + io.getMessage());}} else {return;}}}// 保存文件class saveL implements ActionListener {public void actionPerformed(ActionEvent e) {JFileChooser fc = new JFileChooser();int returnVal = fc.showSaveDialog(JNotePadUI.this);if (returnVal == JFileChooser.APPROVE_OPTION) {String savefile = fc.getSelectedFile().getPath();if (savefile == null) {return;} else {String docToSave = jta.getText();if (docToSave != null) {FileOutputStream fstrm = null;BufferedOutputStream ostrm = null;try {fstrm = new FileOutputStream(savefile);ostrm = new BufferedOutputStream(fstrm);byte[] bytes = null;try {bytes = docToSave.getBytes();} catch (Exception e1) {e1.printStackTrace();}ostrm.write(bytes);} catch (IOException io) {System.err.println("IOException: "+ io.getMessage());} finally {try {ostrm.flush();fstrm.close();ostrm.close();} catch (IOException ioe) {System.err.println("IOException: "+ ioe.getMessage());}}}}} else {return;}}}// 退出class exitL implements ActionListener {public void actionPerformed(ActionEvent e) {System.exit(0);}}// 复制class copyL implements ActionListener {public void actionPerformed(ActionEvent e) {String selection = jta.getSelectedText();StringSelection clipString = new StringSelection(selection);clipbd.setContents(clipString, clipString);}}// 剪切class cutL implements ActionListener {public void actionPerformed(ActionEvent e) {String selection = jta.getSelectedText();StringSelection clipString = new StringSelection(selection);clipbd.setContents(clipString, clipString);jta.replaceRange("", jta.getSelectionStart(), jta.getSelectionEnd());}}// 粘贴class pasteL implements ActionListener {public void actionPerformed(ActionEvent e) {Transferable clipData = clipbd.getContents(JNotePadUI.this);try {String clipString = (String) clipData.getTransferData(DataFlavor.stringFlavor);jta.replaceRange(clipString, jta.getSelectionStart(), jta.getSelectionEnd());} catch (Exception ex){}}}// 删除class deleteL implements ActionListener {public void actionPerformed(ActionEvent e) {jta.replaceRange("", jta.getSelectionStart(), jta.getSelectionEnd());}}//帮助class help_h implements ActionListener{public void actionPerformed(ActionEvent e){JOptionPane.showMessageDialog(jta,"写字板支持拖入文本读取\n" + "由于对编码不熟悉做得\n不是很好 \n ", "帮助主题", JOptionPane.INFORMATION_MESSAGE);}}//关于class help_a implements ActionListener{public void actionPerformed(ActionEvent e){JOptionPane.showMessageDialog(jta,"有不懂的地方联系\n" + "   " + "     JAVA图形界面练习\n", "关于记事本", JOptionPane.INFORMATION_MESSAGE);}}// 事件监听class jtaL implements ActionListener {public void actionPerformed(ActionEvent e) {}}// 快捷键设置file.add(jmi = new JMenuItem("新建N", 'N'));jmi.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, InputEvent.CTRL_MASK));jmi.addActionListener(new newL());file.add(jmi = new JMenuItem("打开O", 'O'));jmi.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_MASK));jmi.addActionListener(new openL());file.add(jmi = new JMenuItem("保存S", 'S'));jmi.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK));jmi.addActionListener(new saveL());file.addSeparator();file.add(jmi = new JMenuItem("退出E", 'E'));jmi.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E, InputEvent.CTRL_MASK));jmi.addActionListener(new exitL());edit.add(jmi = new JMenuItem("复制C", 'C'));jmi.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_MASK));jmi.addActionListener(new copyL());edit.add(jmi = new JMenuItem("剪切X", 'X'));jmi.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_MASK));jmi.addActionListener(new cutL());edit.add(jmi = new JMenuItem("粘帖V",'V'));jmi.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, InputEvent.CTRL_MASK));jmi.addActionListener(new pasteL());edit.add(jmi = new JMenuItem("删除D", 'D'));jmi.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_D, InputEvent.CTRL_MASK));jmi.addActionListener(new deleteL());edit.addSeparator();help.add(jmi = new JMenuItem("帮助(H)", 'H'));jmi.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_H, InputEvent.CTRL_MASK));jmi.addActionListener(new help_h());help.add(jmi = new JMenuItem("关于(A)", 'A'));jmi.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, InputEvent.CTRL_MASK));jmi.addActionListener(new help_a());help.addSeparator();setLayout(new BorderLayout());file.setMnemonic('F');edit.setMnemonic('E');help.setMnemonic('H');jmb.add(file);jmb.add(edit);jmb.add(help);toolBar.setFloatable(true);add(jmb, BorderLayout.NORTH);add(toolBar, BorderLayout.CENTER);add(jsp, BorderLayout.SOUTH);jta.getCaret().setVisible(true);jta.setCaretPosition(0);}// 关闭窗口protected static final class appCloseL extends WindowAdapter {public void windowClosing(WindowEvent e) {System.exit(0);}}// 主函数，程序入口public static void main(String args[]) {JFrame f = new JFrame();JNotePadUI applet = new JNotePadUI();f.setTitle("写字板");f.setBackground(Color.lightGray);f.getContentPane().add(applet, BorderLayout.CENTER);f.addWindowListener(new appCloseL());f.setSize(800, 500);f.setLocation(500,170);f.setVisible(true);f.pack();f.setResizable(false);}
}

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