java记事本

package beok; import java.awt.BorderLayout; import java.awt.Dimension; import javax.swing.JFrame; import javax.swing.JPanel; import java.awt.*; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.JMenuBar; import javax.swing.JMenu; import javax.swing.JMenuItem; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import javax.swing.JFileChooser; import java.awt.event.InputEvent; import javax.swing.KeyStroke; import javax.swing.event.DocumentListener; import javax.swing.event.DocumentEvent; //快捷键的包 /** * <p>Title: </p> * * <p>Description: </p> * * <p>Copyright: Copyright (c) 2007</p> * * <p>Company: </p> * * @author Somany.King * @version 1.0 */ public class MainFrame extends JFrame { JPanel contentPane; JScrollPane jScrollPane = new JScrollPane(); JTextArea txtArea = new JTextArea(); JMenuBar mnuBar = new JMenuBar(); JMenu mnuFile = new JMenu(); JMenu mnuEdit = new JMenu(); JMenu mnuFormat = new JMenu(); JMenu mnuSearch = new JMenu(); JMenu mnuHelp = new JMenu(); public static boolean statement = false; //功能锁定标志位 /*FILE菜单的子菜单*/ JMenuItem mnuOpen = new JMenuItem(); JMenuItem mnuNew = new JMenuItem(); JMenuItem mnuSave = new JMenuItem(); JMenuItem mnuSaveAs = new JMenuItem(); JMenuItem mnuPrint = new JMenuItem(); JMenuItem mnuExit = new JMenuItem(); /*EDIT菜单的子菜单*/ JMenuItem mnuCopy = new JMenuItem(); JMenuItem mnuPaste = new JMenuItem(); JMenuItem mnuCut = new JMenuItem(); /*Format菜单的子菜单*/ JMenuItem mnuBgcolor = new JMenuItem(); JMenuItem mnuFont = new JMenuItem(); /*Search菜单的子菜单*/ JMenuItem mnuSearchIt = new JMenuItem(); /*Help菜单的子菜单*/ JMenuItem mnuAbout = new JMenuItem(); BorderLayout borderLayout1 = new BorderLayout(); File file =null; //临时存放文件对象 boolean textChanged=false; //用来判断原来的文本是否被改变 的标志 public MainFrame() { try { setDefaultCloseOperation(EXIT_ON_CLOSE); jbInit(); } catch (Exception exception) { exception.printStackTrace(); } } /** * Component initialization. * * @throws java.lang.Exception */ private void jbInit() throws Exception { contentPane = (JPanel) getContentPane(); contentPane.setLayout(borderLayout1); this.setJMenuBar(mnuBar); setSize(new Dimension(543, 434)); setTitle("Frame Title"); this.mnuSearch.setVisible(this.statement); //隐藏mnuSearch和mnuFont菜单 this.mnuFont.setVisible(this.statement); txtArea.setText(""); mnuFile.setText("FILE"); //对各菜单起名字 mnuEdit.setText("EDIT"); mnuFormat.setText("FORMAT"); mnuSearch.setText("SEARCH"); mnuHelp.setText("HELP"); FileListener mnuFileListen = new FileListener(this); //产生一个只监听FILE菜单的对象 EditListener mnuEditListen = new EditListener(this); //产生一个只监听EDIT菜单的对象 FormatListener mnuFormatListen = new FormatListener(this);//监听Format菜单的对像 SearchListener mnuSearchListen = new SearchListener(this);//监听Search菜单的对像 HelpListener mnuAboutMe = new HelpListener(this); mnuNew.setText("NEW"); mnuOpen.setText("OPEN"); mnuSave.setText("SAVE"); mnuSaveAs.setText("SAVE AS"); mnuPrint.setText("PRINT"); mnuExit.setText("EXIT"); /*对FILE菜单的各子菜单进行监听*/ mnuOpen.addActionListener(mnuFileListen); //让OPEN菜单被监听 mnuSave.addActionListener(mnuFileListen); //让SAVE菜单被监听 mnuSaveAs.addActionListener(mnuFileListen); //让SAVE AS 菜单被监听 mnuPrint.addActionListener(mnuFileListen); //让PRINT菜单被监听 mnuExit.addActionListener(mnuFileListen); //让EXIT菜单被监听 mnuNew.addActionListener(mnuFileListen); //让NEW菜单被监听 /*命名*/ mnuCopy.setText("COPY"); mnuPaste.setText("PASTE"); mnuCut.setText("CUT"); /*菜单EDIT各子菜单的快捷键*/ mnuCut.setAccelerator(KeyStroke.getKeyStroke('X',InputEvent.CTRL_MASK)); mnuCopy.setAccelerator(KeyStroke.getKeyStroke('C',InputEvent.CTRL_MASK)); mnuPaste.setAccelerator(KeyStroke.getKeyStroke('V',InputEvent.CTRL_MASK)); /*对EDIT菜单的各子菜单进行监听*/ mnuCopy.addActionListener(mnuEditListen); mnuPaste.addActionListener(mnuEditListen); mnuCut.addActionListener(mnuEditListen); /*对Format菜单的各子菜单进行监听*/ mnuBgcolor.addActionListener(mnuFormatListen); mnuFont.addActionListener(mnuFormatListen); mnuBgcolor.setText("BGCOLOR"); mnuFont.setText("FONT"); /*mnuSearch菜单的子菜单命名*/ mnuSearchIt.setText("SEARCH"); /*让其被监听*/ mnuSearchIt.addActionListener(mnuSearchListen); /*对Help菜单的监听*/ mnuAbout.setText("ABOUT-ME"); mnuAbout.addActionListener(mnuAboutMe); /*对文本进行监听-------注意：DocumentListener是一个抽像类，使用前必须将其具体化 这里在addDoucmentListener的小括号里 生成一个对象的同时并定义了他的各种方法（即对他的方法具体化）*/ this.txtArea.getDocument().addDocumentListener(new DocumentListener() { public void insertUpdate(DocumentEvent e) { //如果查入 即为文本被修改 textChanged = true; } public void removeUpdate(DocumentEvent e) { //如果删除 即为文本被修改 textChanged = true; } public void changedUpdate(DocumentEvent e) { //不大理解 } }); mnuBar.add(mnuFile); //各菜单添加子菜单 mnuBar.add(mnuEdit); mnuBar.add(mnuFormat); mnuBar.add(mnuSearch); mnuBar.add(mnuHelp); mnuFile.add(mnuNew); mnuFile.add(mnuOpen); mnuFile.add(mnuSave); mnuFile.add(mnuSaveAs); mnuFile.addSeparator(); mnuFile.add(mnuPrint); mnuFile.add(mnuExit); contentPane.add(jScrollPane,java.awt.BorderLayout.CENTER); jScrollPane.getViewport().add(txtArea); mnuEdit.add(mnuCopy); mnuEdit.add(mnuPaste); mnuEdit.add(mnuCut); mnuFormat.add(mnuBgcolor); mnuFormat.add(mnuFont); mnuSearch.add(mnuSearchIt); mnuHelp.add(mnuAbout); } }