记事本

 import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import javax.swing.undo.*;

import javax.swing.event.*;

public class NotePad extends JFrame {

 private UndoManager manager;

 private JFileChooser choose;

 private File selectedfile;

 private JTextArea text;

 private java.awt.Container container;

 private JMenuBar menuBar;

 private JTextField status;

 private boolean newPage = false;

 // File菜单

 private JMenu menu;

 private JMenuItem newText;

 private JMenuItem open;

 private JCheckBoxMenuItem readOnly;

 private JMenuItem save;

 private JMenuItem saveAs;

 private JMenuItem exit;

 // Edit菜单

 private JMenu edit;

 private JMenuItem undo;

 private JMenuItem redo;

 private JMenuItem cut;

 private JMenuItem copy;

 private JMenuItem copyAll;

 private JMenuItem paste;

 private JMenuItem delete;

 private JMenuItem deleteAll;

 private JMenuItem selectAll;

 private JMenuItem searchAndReplace;

 // 视图菜单

 private JMenu view;

 private JCheckBoxMenuItem wrap;

 private JCheckBoxMenuItem onTop;

 private JMenuItem zoomIn;

 private JMenuItem zoomOut;

 // 工具菜单

 private JMenu tool;

 private JMenuItem fontSum;

 private JMenuItem setcolor;

 private JMenuItem setFontColor;

 // 帮助菜单

 private JMenu help;

 private JMenuItem about;

 // 右键菜单

 private JPopupMenu pop;

 private JMenuItem popUndo;

 private JMenuItem popRedo;

 private JMenuItem popCut;

 private JMenuItem popCopy;

 private JMenuItem popSelectAll;

 private JMenuItem popCopyAll;

 private JMenuItem popPaste;

 private JMenuItem popDelete;

 private JMenuItem popClear;

 

 public NotePad() {

  super("记事本");

  try{

   UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

  }catch(Exception e){}

  container = getContentPane();

  container.setLayout(new BorderLayout(0,-2));

  manager = new UndoManager();

  text = new JTextArea();

  text.setFont(new Font("宋体",Font.PLAIN,14));

  text.getDocument().addUndoableEditListener(manager);

  text.setTabSize(2);

  text.setSelectedTextColor(Color.WHITE);

  text.setSelectionColor(Color.DARK_GRAY);

  text.setLineWrap(true);

  text.setWrapStyleWord(true);

  text.setCaretColor(Color.RED);

  text.setMargin(new Insets(3, 10, 3, 7));

  text.setDragEnabled(true);

  container.add(new JScrollPane(text,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED));

  menuBar = new JMenuBar();

  // File菜单

  menu = new JMenu("文件(F)");

  menu.setMnemonic('F');

  newText = new JMenuItem("新建(N)");

  newText.setMnemonic('N');

  newText.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    if(selectedfile == null && !text.getText().equals("")  &&

      JOptionPane.showConfirmDialog(container, "是否保存", "是否保存", JOptionPane.YES_NO_OPTION) == JOptionPane.YES_OPTION){

     choose = new JFileChooser();

     int state = choose.showSaveDialog(container);

     if (state == JFileChooser.APPROVE_OPTION) {

      try {

       File file = choose.getSelectedFile();

       FileWriter os = new FileWriter(file);

       os.write(text.getText(), 0, text.getText().length());

       os.flush();

       file.createNewFile();

       os.close();

      } catch (IOException e) {

       JOptionPane.showMessageDialog(container, "保存文件失败","ERROR", JOptionPane.ERROR_MESSAGE);

      }

     }

    }else if(selectedfile != null && 

      JOptionPane.showConfirmDialog(container, "是否保存", "是否保存", JOptionPane.YES_NO_OPTION) == JOptionPane.YES_OPTION){

    try {

      FileWriter os = new FileWriter(selectedfile);

      os.write(text.getText(), 0, text.getText().length());

      os.flush();

      os.close();

    } catch (IOException e) {}

   }

   text.setText("");

   newPage = true; 

   selectedfile = null;

   status.setText("");

   }

  });

 

  open = new JMenuItem("打开(O)");

  open.setMnemonic('O');

  open.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    if(selectedfile!=null && 

      JOptionPane.showConfirmDialog(container, "是否保存", "是否保存", JOptionPane.YES_NO_OPTION) == JOptionPane.YES_NO_OPTION){

     try{

      FileWriter os = new FileWriter(selectedfile);

      os.write(text.getText(), 0, text.getText().length());

      os.flush();

      os.close();

      newPage = false;

     }catch(IOException e){}

    }else if(selectedfile==null && !text.getText().equals("") &&

      JOptionPane.showConfirmDialog(container, "是否保存", "是否保存", JOptionPane.YES_NO_OPTION) == JOptionPane.YES_NO_OPTION){

     choose = new JFileChooser();

     int state = choose.showSaveDialog(container);

     if (state == JFileChooser.APPROVE_OPTION) {

      try {

       File file = choose.getSelectedFile();

       FileWriter os = new FileWriter(file);

       os.write(text.getText(), 0, text.getText().length());

       os.flush();

       file.createNewFile();

       os.close();

       newPage = false;

      } catch (IOException e) {

       JOptionPane.showMessageDialog(container, "保存文件失败",

         "ERROR", JOptionPane.ERROR_MESSAGE);

      }

     }

    }

    choose = new JFileChooser();

    choose.setFileFilter(new filter());

    int state = choose.showOpenDialog(container);

    if (state == JFileChooser.APPROVE_OPTION) {

     status.setText(choose.getSelectedFile().toString());

     try {

      selectedfile = choose.getSelectedFile();

      FileReader isr = new FileReader(selectedfile);

      text.read(isr, "");

      isr.close();

      newPage = false;

     } catch (IOException e) {

      JOptionPane.showMessageDialog(container, "打开文件失败",

        "ERROR", JOptionPane.ERROR_MESSAGE);

     }

    }

 

   }

  });

 

  readOnly = new JCheckBoxMenuItem("只读模式(R)");

  readOnly.setMnemonic('R');

  readOnly.addChangeListener(new ChangeListener() {

   public void stateChanged(ChangeEvent event) {

    if(readOnly.isSelected()){

     text.setEditable(false);

     cut.setEnabled(false);

     paste.setEnabled(false);

     delete.setEnabled(false);

     deleteAll.setEnabled(false);

     redo.setEnabled(false);

     undo.setEnabled(false);

     searchAndReplace.setEnabled(false);

     

     popClear.setEnabled(false);

     popCut.setEnabled(false);

     popDelete.setEnabled(false);

     popPaste.setEnabled(false);

     popRedo.setEnabled(false);

     popUndo.setEnabled(false);

    }

    else{

     text.setEditable(true);

     cut.setEnabled(true);

     paste.setEnabled(true);

     delete.setEnabled(true);

     deleteAll.setEnabled(true);

     redo.setEnabled(true);

     undo.setEnabled(true);

     searchAndReplace.setEnabled(true);

     

     popClear.setEnabled(true);

     popCut.setEnabled(true);

     popDelete.setEnabled(true);

     popPaste.setEnabled(true);

     popRedo.setEnabled(true);

     popUndo.setEnabled(true);

    }

   }

  });

 

  save = new JMenuItem("保存(S)");

  save.setMnemonic('S');

  save.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    if (newPage == true || selectedfile == null) {

     choose = new JFileChooser();

     int state = choose.showSaveDialog(container);

     if (state == JFileChooser.APPROVE_OPTION) {

      try {

       File file = choose.getSelectedFile();

       FileWriter os = new FileWriter(file);

       os.write(text.getText(), 0, text.getText().length());

       os.flush();

       file.createNewFile();

       os.close();

       newPage = false;

      } catch (IOException e) {

       JOptionPane.showMessageDialog(container, "保存文件失败","ERROR", JOptionPane.ERROR_MESSAGE);

      }

     }

    } else if(newPage == false && selectedfile != null){

     try {

      FileWriter os = new FileWriter(selectedfile);

      os.write(text.getText(), 0, text.getText().length());

      os.flush();

      os.close();

     } catch (IOException e) {

      JOptionPane.showMessageDialog(container, "保存文件失败","ERROR", JOptionPane.ERROR_MESSAGE);

     }

    }

   }

  });

 

  saveAs = new JMenuItem("另存为(A)");

  saveAs.setMnemonic('A');

  saveAs.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    choose = new JFileChooser();

    int state = choose.showSaveDialog(container);

    if (state == JFileChooser.APPROVE_OPTION) {

     try {

      File file = choose.getSelectedFile();

      FileWriter os = new FileWriter(file);

      os.write(text.getText(), 0, text.getText().length());

      os.flush();

      file.createNewFile();

      os.close();

      newPage = false;

     } catch (IOException e) {

      JOptionPane.showMessageDialog(container, "保存文件失败","ERROR", JOptionPane.ERROR_MESSAGE);

     }

    }

   }

  });

 

  exit = new JMenuItem("退出(Q)");

  exit.setMnemonic('Q');

  exit.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    System.exit(0);

   }

  });

 

  menu.add(newText);

  menu.add(open);

  menu.add(readOnly);

  menu.add(save);

  menu.add(saveAs);

  menu.add(exit);

 

  // Edit菜单

  edit = new JMenu("编辑(E)");

  edit.setMnemonic('E');

 

  undo = new JMenuItem("撤销(U)");

  undo.setMnemonic('U');

  undo.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    if (manager.canUndo())

     manager.undo();

   }

  });

 

  redo = new JMenuItem("重做(Y)");

  redo.setMnemonic('Y');

  redo.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    if (manager.canRedo())

     manager.redo();

   }

  });

 

  cut = new JMenuItem("剪切(X)");

  cut.setMnemonic('X');

  cut.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.cut();

   }

  });

 

  copy = new JMenuItem("复制(C)");

  copy.setMnemonic('C');

  copy.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.copy();

   }

  });

 

  copyAll = new JMenuItem("复制所有(Z)");

  copyAll.setMnemonic('Z');

  copyAll.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.selectAll();

    text.copy();

   }

  });

 

  paste = new JMenuItem("粘贴(V)");

  paste.setMnemonic('V');

  paste.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.paste();

   }

  });

 

  delete = new JMenuItem("删除(D)");

  delete.setMnemonic('D');

  delete.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.replaceRange("", text.getSelectionStart(), text

      .getSelectionEnd());

   }

  });

 

  deleteAll = new JMenuItem("删除所有(W)");

  deleteAll.setMnemonic('W');

  deleteAll.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.replaceRange("", 0, text.getText().length());

   }

  });

 

  selectAll = new JMenuItem("选择所有(B)");

  selectAll.setMnemonic('B');

  selectAll.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.selectAll();

   }

  });

 

  searchAndReplace = new JMenuItem("查找与替换(M)");

  searchAndReplace.setMnemonic('M');

  searchAndReplace.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    new Search();

   }

  });

 

  edit.add(undo);

  edit.add(redo);

  edit.addSeparator();

  edit.add(selectAll);

  edit.add(cut);

  edit.add(copy);

  edit.add(copyAll);

  edit.add(paste);

  edit.add(delete);

  edit.add(deleteAll);

  edit.addSeparator();

  edit.add(searchAndReplace);

 

  // 视图菜单

  view = new JMenu("视图(V)");

  view.setMnemonic('V');

 

  wrap = new JCheckBoxMenuItem("自动换行(J)");

  wrap.setSelected(true);

  wrap.setMnemonic('J');

  wrap.addChangeListener(new ChangeListener() {

   public void stateChanged(ChangeEvent event) {

    text.setLineWrap(wrap.isSelected());

   }

  });

  

  onTop = new JCheckBoxMenuItem("保持窗口在最上");

  onTop.addChangeListener(

    new ChangeListener(){

     public void stateChanged(ChangeEvent event){

      keepOnTop(onTop.isSelected());

     }

    }

    );

  

  

  zoomIn = new JMenuItem("放大页面(I)");

  zoomIn.setMnemonic('I');

  zoomIn.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    String fontName = text.getFont().getFontName();

    int fontSize = text.getFont().getSize();

    int style = text.getFont().getStyle();

    if (fontSize < 70)

     text.setFont(new Font(fontName, style, fontSize + 2));

   }

  });

 

  zoomOut = new JMenuItem("缩小页面(O)");

  zoomOut.setMnemonic('O');

  zoomOut.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    String fontName = text.getFont().getFontName();

    int fontSize = text.getFont().getSize();

    int style = text.getFont().getStyle();

    if (fontSize > 9)

     text.setFont(new Font(fontName, style, fontSize - 1));

   }

  });

 

  view.add(wrap);

  view.addSeparator();

  view.add(onTop);

  view.addSeparator();

  view.add(zoomIn);

  view.add(zoomOut);

 

  // 工具菜单

  tool = new JMenu("工具(T)");

  tool.setMnemonic('T');

  fontSum = new JMenuItem("字数统计(L)");

  fontSum.setMnemonic('L');

  fontSum.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    String all = text.getText();

    int space = 0;// 空格

    int letter = 0;// 英文字母

    int digit = 0;// 数字

    int enter = 0;// 换行

    int other = 0;// 其它

    int otherLetter = 0;

    for (int i = 0; i < all.length(); i++) {

     char ch = all.charAt(i);

     if (Character.isDigit(ch))

      digit++;

     else if (Character.isLowerCase(ch)

       || Character.isUpperCase(ch))

      letter++;

     else if (Character.isLetter(ch))

      otherLetter++;

     else if (Character.isSpaceChar(ch))

      space++;

     else if (ch == 10)

      enter++;

     else

      other++;

    }

    JOptionPane.showMessageDialog(container, "字符个数：/n/n数字：" + digit

      + "/n英文字母：" + letter + "/n其它字母:" + otherLetter

      + "/n空格：" + space + "/n换行：" + enter + "/n其它：" + other,

      "字符统计", JOptionPane.INFORMATION_MESSAGE);

   }

  });

  setFontColor = new JMenuItem("设置字体颜色");

  setFontColor.addActionListener(

    new ActionListener(){

     public void actionPerformed(ActionEvent event){

      Color color = JColorChooser.showDialog(container, "字体色选择", Color.BLACK);

      text.setForeground(color);

     }

    }

    );

  

  setcolor = new JMenuItem("设置背景色(G)");

  setcolor.setMnemonic('G');

  setcolor.addActionListener(

    new ActionListener(){

     public void actionPerformed(ActionEvent event){

      Color color = JColorChooser.showDialog(container, "背景色选择", Color.WHITE);

      text.setBackground(color);

     }

    }

    );

  

  tool.add(fontSum);

  //tool.add(setfont);

  tool.add(setFontColor);

  tool.add(setcolor);

 

  // 帮助菜单

  help = new JMenu("帮助(H)");

  help.setMnemonic('H');

  about = new JMenuItem("关于(P)");

  about.setMnemonic('P');

  about.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    JOptionPane.showMessageDialog(container, "Java记事本", "关于",

      JOptionPane.INFORMATION_MESSAGE);

   }

  });

 

  help.add(about);

 

  menuBar.add(menu);

  menuBar.add(edit);

  menuBar.add(view);

  menuBar.add(tool);

  menuBar.add(help);

 

  // popupMenu

  pop = new JPopupMenu();

  popUndo = new JMenuItem("撤销");

  popUndo.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    if (manager.canUndo())

     manager.undo();

   }

  });

  popRedo = new JMenuItem("重做");

  popRedo.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    if (manager.canRedo())

     manager.redo();

   }

  });

  popCut = new JMenuItem("剪切");

  popCut.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.cut();

   }

  });

  popCopy = new JMenuItem("复制");

  popCopy.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.copy();

   }

  });

  popSelectAll = new JMenuItem("全部选择");

  popSelectAll.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.selectAll();

   }

  });

  popCopyAll = new JMenuItem("全部复制");

  popCopyAll.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.selectAll();

    text.copy();

   }

  });

  popPaste = new JMenuItem("粘贴");

  popPaste.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.paste();

   }

  });

  popDelete = new JMenuItem("删除");

  popDelete.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.replaceRange("", text.getSelectionStart(), text

      .getSelectionEnd());

   }

  });

  popClear = new JMenuItem("清空");

  popClear.addActionListener(new ActionListener() {

   public void actionPerformed(ActionEvent event) {

    text.setText("");

   }

  });

 

  pop.add(popUndo);

  pop.add(popRedo);

  pop.addSeparator();

  pop.add(popCut);

  pop.add(popCopy);

  pop.add(popPaste);

  pop.add(popCopyAll);

  pop.add(popSelectAll);

  pop.add(popDelete);

  pop.add(popClear);

 

  text.add(pop);

  text.addMouseListener(new MouseAdapter() {

   public void mouseReleased(MouseEvent event) {

    if (event.isPopupTrigger()) {

     pop.setVisible(true);

     pop.show(text, event.getX(), event.getY());

    }

   }

  });

 

  status = new JTextField();

  status.setEditable(false);

  container.add(status, BorderLayout.SOUTH);

  setSize(730, 660);

  // pack();

  container.add(menuBar, BorderLayout.NORTH);

  Dimension frameSize = getSize();

  Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

  setLocation((screenSize.width - frameSize.width) / 2,

    (screenSize.height - frameSize.height) / 2);

  setVisible(true);

  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  

 }

 

 

 public static void main(String args[]) {

  new NotePad();

 }

 

 private void keepOnTop(boolean b){

  setAlwaysOnTop(b);

 }

 

 private class Search extends JFrame {

 

  private JTabbedPane tab;

  private Container cont;

  // 查找

  private JPanel searPanel;

  private JTextField searField;

  private JButton searButton;

 

  // 替换

  private JPanel replPanel;

  private JPanel buttonPanel;

  private JTextField replField;

  private JButton replButton;

  private JLabel label;

  private JTextField replSear;

 

  public Search() {

   super("查找与替换");

   cont = getContentPane();

   tab = new JTabbedPane(JTabbedPane.TOP);

 

   // 查找

   searPanel = new JPanel(new FlowLayout());

   searField = new JTextField(15);

   searButton = new JButton("查找下一处");

   searPanel.add(searField);

   searPanel.add(searButton);

   searButton.addActionListener(new ActionListener() {

    public void actionPerformed(ActionEvent event) {

     String searText = searField.getText().trim();

     if (searText.equals("")) {

      JOptionPane.showMessageDialog(cont, "查找串为空", "提示信息",JOptionPane.INFORMATION_MESSAGE);

     } else {

      String allText = text.getText();

      int start = allText.indexOf(searText, text.getSelectionEnd());

      if (start == -1)

       JOptionPane.showMessageDialog(container,"已到达文件末尾，没有找到/n" + searText, "提示信息",JOptionPane.INFORMATION_MESSAGE);

      else

       text.select(start, start + searText.length());

     }

    }

   });

 

   // 替换

   replPanel = new JPanel(new GridLayout(3, 1));

   buttonPanel = new JPanel(new FlowLayout());

   label = new JLabel("替换为");

   replField = new JTextField(15);

   replSear = new JTextField(15);

   replButton = new JButton("替换下一处");

   replButton.addActionListener(new ActionListener() {

    public void actionPerformed(ActionEvent event) {

     String searText = replSear.getText();

     if (searText.equals("")) {

      JOptionPane.showMessageDialog(cont, "要替换的串为空", "提示信息", JOptionPane.INFORMATION_MESSAGE);

     } else {

      String allText = text.getText();

      int start = allText.indexOf(searText, text.getSelectionEnd());

      if (start == -1)

       JOptionPane.showMessageDialog(container, "替换完毕","提示信息", JOptionPane.INFORMATION_MESSAGE);

      else

       text.replaceRange(replField.getText(), start, start + searText.length());

     }

    }

   });

   replPanel.add(replSear);

   replPanel.add(label);

   replPanel.add(replField);

   buttonPanel.add(replButton);

   JPanel panel = new JPanel(new FlowLayout());

   panel.add(replPanel);

   panel.add(buttonPanel);

 

   tab.addTab("查找", searPanel);

   tab.addTab("替换", panel);

   tab.setVisible(true);

   cont.add(tab);

   pack();

   Point paraLoca = container.getLocationOnScreen();

   setLocation(paraLoca.y + getSize().width, paraLoca.x

     + getSize().height);

   setVisible(true);

   setResizable(false);

   addWindowListener(new WindowAdapter() {

    public void windowClosing() {

     dispose();

    }

   });

  }

 }

 

 private class filter extends javax.swing.filechooser.FileFilter {

  public boolean accept(File file){

   String name = file.getName().toLowerCase();

   if(name.endsWith(".txt") || name.endsWith(".cmd") ||file.isDirectory() ||

     name.endsWith(".sql") || name.endsWith(".properties") || name.endsWith(".java") ||

     name.endsWith(".cpp") || name.endsWith(".c") || name.endsWith(".css") ||

     name.endsWith(".js") || name.endsWith(".xml") || name.endsWith(".html") || 

     name.endsWith(".log"))

    return true;

   else

    return false;

  }

  public String getDescription(){

   return ".txt | .cmd | .sql |.properties | .java | .cpp | .c | .css | .js | .xml | .html |.log";

  }

 }

}