java版Notepad

java版Notepad

经常有人找这个，发一个增加点访问量

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";
  }
 }
}