Java 记事本 源代码

转自：http://blog.sina.com.cn/s/blog_666c46fb0100kw3v.html

Java记事本源代码，总共有三步。
第一步：建一个新类，名字是kk。kk.java的源代码如下所示：

import javax.swing.*;

import java.awt.*;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.event.*;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.File;

public class kk extends Frame implements ActionListener{
final FontChooser fontChooser1 = new FontChooser(kk.this);
//FontPicker fontChooser1=new FontPicker();
TextArea textarea=new TextArea();
MenuBar menubar=new MenuBar();

Menu filemenu=new Menu("文件");
MenuItem newitem=new MenuItem("新建");
MenuItem openitem=new MenuItem("打开");
MenuItem saveasitem=new MenuItem("保存");
MenuItem exititem=new MenuItem("退出");
Menu editmenu=new Menu("编辑");
MenuItem selectitem=new MenuItem("全选");
MenuItem copyitem=new MenuItem("复制");
MenuItem cutitem=new MenuItem("剪切");
MenuItem pasteitem=new MenuItem("粘贴");

Menu wordmenu=new Menu("字体");
MenuItem qianitem=new MenuItem("设置前景色");
MenuItem beiitem=new MenuItem("设置背景色");
MenuItem ziitem=new MenuItem("字体格式");

Menu aboutmenu=new Menu("关于");
MenuItem info=new MenuItem("关于记事本");

JToolBar toolBar=new JToolBar();
ImageIcon leftButtonIcon=new ImageIcon("new.gif");
ImageIcon middleButtonIcon=new ImageIcon("open.gif");
ImageIcon rightButtonIcon=new ImageIcon("save.gif");
ImageIcon copyButtonIcon=new ImageIcon("copy.gif");
ImageIcon cutButtonIcon=new ImageIcon("cut.gif");
ImageIcon pasteButtonIcon=new ImageIcon("paste.gif");
JButton jb1=new JButton("新建（N）",leftButtonIcon);
JButton jb2=new JButton("打开（O）",middleButtonIcon);
JButton jb3=new JButton("保存（S）",rightButtonIcon);
JButton jb4=new JButton("复制（C）",copyButtonIcon);
JButton jb5=new JButton("剪切（X）",cutButtonIcon);
JButton jb6=new JButton("粘贴（V）",pasteButtonIcon);

String fileName="NoName";
Toolkit toolkit=Toolkit.getDefaultToolkit();
Clipboard clipboard=toolkit.getSystemClipboard();
private FileDialog openFileDialog=new FileDialog(this,"打开文

件",FileDialog.LOAD);
private FileDialog saveAsFileDialog=new FileDialog(this,"保存文

件",FileDialog.SAVE);

public kk(){
setTitle("记事本");
setFont(new Font("Times New Roman",Font.PLAIN,20));
setBackground(Color.white);
setSize(800,600);
setLocation(100,100);

jb1.setToolTipText("新建文件，快捷键Alt+N");
jb2.setToolTipText("打开文件，快捷键Alt+O");
jb3.setToolTipText("保存文件，快捷键Alt+S");
jb4.setToolTipText("复制文件，快捷键Alt+C");
jb5.setToolTipText("剪切文件，快捷键Alt+X");
jb6.setToolTipText("粘贴文件，快捷键Alt+V");
// jb1.setVerticalTextPosition(AbstractButton.CENTER);//水平中间对齐
// jb1.setHorizontalTextPosition(AbstractButton.LEADING);//相当于LEFT

filemenu.add(newitem);
filemenu.add(openitem);
filemenu.addSeparator();
filemenu.add(saveasitem);
filemenu.addSeparator();
filemenu.add(exititem);
// filemenu.setMnemonic('F');

editmenu.add(selectitem);
editmenu.add(copyitem);
editmenu.addSeparator();
editmenu.add(cutitem);
editmenu.add(pasteitem);

wordmenu.add(qianitem);
wordmenu.add(beiitem);
wordmenu.addSeparator();
wordmenu.add(ziitem);

toolBar.add(jb1);
toolBar.add(jb2);
toolBar.add(jb3);
toolBar.add(jb4);
toolBar.add(jb5);
toolBar.add(jb6);

menubar.add(filemenu);
menubar.add(editmenu);
menubar.add(wordmenu);
menubar.add(aboutmenu);
aboutmenu.add(info);
setMenuBar(menubar);

// setMenuBar(menubar);
setLayout(new BorderLayout());
add(textarea,BorderLayout.CENTER);
add(toolBar,BorderLayout.NORTH);
addWindowListener(new WindowAdapter(){public void windowClosing

(WindowEvent e){System.exit(0);}});
newitem.addActionListener(this);
openitem.addActionListener(this);
saveasitem.addActionListener(this);
exititem.addActionListener(this);
selectitem.addActionListener(this);
copyitem.addActionListener(this);
cutitem.addActionListener(this);
pasteitem.addActionListener(this);
info.addActionListener(this);

jb1.addActionListener(this);
jb2.addActionListener(this);
jb3.addActionListener(this);
jb4.addActionListener(this);
jb5.addActionListener(this);
jb6.addActionListener(this);
jb1.setMnemonic(KeyEvent.VK_N);
jb2.setMnemonic(KeyEvent.VK_O);
jb3.setMnemonic(KeyEvent.VK_S);
jb4.setMnemonic(KeyEvent.VK_C);
jb5.setMnemonic(KeyEvent.VK_X);
jb6.setMnemonic(KeyEvent.VK_V);

qianitem.addActionListener(this);
beiitem.addActionListener(this);
ziitem.addActionListener(this);

}
public void actionPerformed(ActionEvent e){
Object eventSource=e.getSource();
if(eventSource==newitem){
   textarea.setText("");
}else if(eventSource==openitem){
   openFileDialog.show();
   fileName=openFileDialog.getDirectory()+openFileDialog.getFile();
   if(fileName!=null)
    readFile(fileName);
}
else if(eventSource==saveasitem){

saveAsFileDialog.show();
fileName=saveAsFileDialog.getDirectory()+saveAsFileDialog.getFile();
if(fileName!=null)
   writeFile(fileName);
}
else if(eventSource==selectitem){
textarea.selectAll();
}
else if(eventSource==copyitem){
   String text = textarea.getSelectedText();
       StringSelection selection= new StringSelection(text);
      
       clipboard.setContents(selection,null);
   }
else if(eventSource==cutitem){
String text=textarea.getSelectedText();
StringSelection selection=new StringSelection(text);
clipboard.setContents(selection, null);
textarea.replaceRange("",textarea.getSelectionStart

(),textarea.getSelectionEnd());
}else if(eventSource==pasteitem){
Transferable contents=clipboard.getContents(this);
if(contents==null)
   return;
   String text;
   text="";
   try{text=(String) contents.getTransferData

(DataFlavor.stringFlavor);}catch (Exception exception){
   }textarea.replaceRange(text, textarea.getSelectionStart

(),textarea.getSelectionEnd() );
}else if(eventSource==exititem)

{
//   System.exit(0);

   Object[] options = { "是","否", "取消" };
     int s = JOptionPane.showOptionDialog(null, "按“否”后，直接退出记

事本，文档将会消失，无法恢复。" +
        "\n按“是”后，进行保存文档操作。保存完毕后，自动退出记事本，程

序结束运行。\n按”取消“后，返回记事本继续编辑。", "警告！请注意保存文

档！",
       JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE, null,
       options, options[0]);
     if (s == JOptionPane.YES_OPTION)
     {
      saveAsFileDialog.show();
     fileName=saveAsFileDialog.getDirectory()+saveAsFileDialog.getFile

();
     if(fileName!=null){
      writeFile(fileName);
     }
     System.exit(0);
     }
     else if (s == JOptionPane.NO_OPTION)
     {
     System.exit(0);
      }
}

// {
////   System.exit(0);
//
//   Object[] options = { "确定", "取消" };
//     int s = JOptionPane.showOptionDialog(null, "按“确定”后，退出记

事本，文档将会消失，无法恢复。" +
//        "\n按“取消”后，进行保存文档操作。\n保存完毕后，自动退出记事

本，程序结束运行。", "警告！请注意保存文档！",
//       JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE, null,
//       options, options[0]);
//     if (s == JOptionPane.YES_OPTION)
//     {
//      System.exit(0);
//     }
//     else if (s == JOptionPane.NO_OPTION)
//     {
//      saveAsFileDialog.show();
//     fileName=saveAsFileDialog.getDirectory()

+saveAsFileDialog.getFile();
//     if(fileName!=null){
//      writeFile(fileName);
//     }
//     System.exit(0);
//      }
// }
else if(eventSource==info){

//   Icon help_icon = new ImageIcon("doit.jpg");
//     String help = "DOIT(R)记事本\n版本1.0 (内部版本号

2008.xp_sp2_dave.080423-10)\n版权"
//       + "所有 （C） 2008-2008 DOIT。\n最终解释权归本人所有，"
//       + "授权给：\n\nBuild By Davezhang\nQQ:442803117

\nBolg:http://hi.baidu.com.442803117"
//       + "\nEmail:[e-mail]";
//     JOptionPane.showConfirmDialog(null, help, "帮助",
//       JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE,
//       help_icon);

   Icon help_icon = new ImageIcon("doit.jpg");
     String help = "感谢您的使用！\n本记事本程序暂无帮助，您可以参考

WindowsXP的记事本帮助程序！\n"
       + "欢迎和作者联系交流！\n"
       + "Build By HaoPenghua\nQQ:1013795885\nBolg:http://hi.baidu.com/

郝鹏华"
       + "\nEmail:[e-mail]";
     JOptionPane.showConfirmDialog(null, help, "关于记事本",
       JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE,
       help_icon);

//   JOptionPane.showMessageDialog(null,"本软件是一个小的记事本，欢迎大

家使用！" );//显示信息对话框
}
else if(eventSource==qianitem){
   Color color=JColorChooser.showDialog(this,"前景

色",textarea.getForeground());
   if(color!=null){
    textarea.setForeground(color);
   }
}
else if(eventSource==beiitem){
   Color color=JColorChooser.showDialog(this,"背景

色",textarea.getBackground());
   if(color!=null){
    textarea.setBackground(color);
   }
}
else if(eventSource==ziitem){

   fontChooser1.setVisible(true);
         // If we got a real font choice, then update our go button
         if (fontChooser1.getNewFont() != null) {
         textarea.setFont(fontChooser1.getNewFont());
         textarea.setForeground(fontChooser1.getNewColor());
         }  

// fontChooser1=new FontPicker();
   fontChooser1.show();
//   fontChooser1.setSelectedFont(textarea.getFont());
//   if(fontChooser1.showDialog()){
//    Font font=fontChooser1.setSelectedFont(font);
//    textarea.setFont(font);
//   }
//   this.repaint();
//   textarea.repaint();
}
else if(eventSource==jb1){
   textarea.setText("");
}
else if(eventSource==jb2){
   openFileDialog.show();
   fileName=openFileDialog.getDirectory()+openFileDialog.getFile();
   if(fileName!=null)
    readFile(fileName);
}
else if(eventSource==jb3){
   saveAsFileDialog.show();
   fileName=saveAsFileDialog.getDirectory()+saveAsFileDialog.getFile();
   if(fileName!=null)
    writeFile(fileName);
}
else if(eventSource==jb4){
   String text = textarea.getSelectedText();
       StringSelection selection= new StringSelection(text);
      
       clipboard.setContents(selection,null);
}
else if(eventSource==jb5){
   String text=textarea.getSelectedText();
   StringSelection selection=new StringSelection(text);
   clipboard.setContents(selection, null);
   textarea.replaceRange("",textarea.getSelectionStart

(),textarea.getSelectionEnd());
}
else if(eventSource==jb6){
   Transferable contents=clipboard.getContents(this);
   if(contents==null)
    return;
    String text;
    text="";
    try{text=(String) contents.getTransferData

(DataFlavor.stringFlavor);}catch (Exception exception){
    }textarea.replaceRange(text, textarea.getSelectionStart

(),textarea.getSelectionEnd() );
}
}
public void readFile(String fileName){
   try{
  
    File file=new File(fileName);
    FileReader readIn=new FileReader(file);
    int size=(int) file.length();
    int charsRead=0;
    char[] content=new char[size];
    while(readIn.ready())
     charsRead+=readIn.read(content,charsRead,size-charsRead);
    readIn.close();
    textarea.setText(new String(content,0,charsRead));
   }catch (IOException e){
    System.out.println("Error Opening file");
   }

}
public void writeFile(String fileName){
   try{
    File file=new File(fileName);
    FileWriter writeOut=new FileWriter(file);
    writeOut.write(textarea.getText());
    writeOut.close();
   }catch (IOException e){
    System.out.println("Error writing file");
   }
}
public static void main(String[] args){
   kk frame=new kk();
   frame.show();
}
}
第二步：再建一个新类，名字是FontPicker。FontPicker.java和kk.java必须在

同一目录下，FontPicker.java的源代码如下所示：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JColorChooser;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.text.AttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;

public class FontPicker extends JFrame {

Color c;

public FontPicker() {
    super("JColorChooser Test Frame");
    setSize(200, 100);
    final JButton go = new JButton("Show FontChooser");
    go.addActionListener(new ActionListener() {
      final FontChooser chooser = new FontChooser(FontPicker.this);

      boolean first = true;

      public void actionPerformed(ActionEvent e) {
        chooser.setVisible(true);
        // If we got a real font choice, then update our go button
        if (chooser.getNewFont() != null) {
          go.setFont(chooser.getNewFont());
          go.setForeground(chooser.getNewColor());
        }
      }
    });
    getContentPane().add(go);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
}

public static void main(String args[]) {
    FontPicker fp = new FontPicker();
    fp.setVisible(true);
}
}

//FontChooser.java
//A font chooser that allows users to pick a font by name, size, style,

and
//color. The color selection is provided by a JColorChooser pane. This
//dialog builds an AttributeSet suitable for use with JTextPane.
//

class FontChooser extends JDialog implements ActionListener {

JColorChooser colorChooser;

JComboBox fontName;

JCheckBox fontBold, fontItalic;

JTextField fontSize;

JLabel previewLabel;

SimpleAttributeSet attributes;

Font newFont;

Color newColor;

public FontChooser(Frame parent) {
    super(parent, "字体格式", true);
    setSize(450, 450);
    attributes = new SimpleAttributeSet();

    // Make sure that any way the user cancels the window does the

right
    // thing
//    addWindowListener(new WindowAdapter() {
//      public void windowClosing(WindowEvent e) {
//        closeAndCancel();
//      }
//    });

    // Start the long process of setting up our interface
    Container c = getContentPane();

    JPanel fontPanel = new JPanel();
    fontName = new JComboBox(new String[] { "TimesRoman", "Helvetica",
        "Courier" });
    fontName.setSelectedIndex(1);
    fontName.addActionListener(this);
    fontSize = new JTextField("12", 4);
    fontSize.setHorizontalAlignment(SwingConstants.RIGHT);
    fontSize.addActionListener(this);
    fontBold = new JCheckBox("Bold");
    fontBold.setSelected(true);
    fontBold.addActionListener(this);
    fontItalic = new JCheckBox("Italic");
    fontItalic.addActionListener(this);

    fontPanel.add(fontName);
    fontPanel.add(new JLabel(" Size: "));
    fontPanel.add(fontSize);
    fontPanel.add(fontBold);
    fontPanel.add(fontItalic);

    c.add(fontPanel, BorderLayout.NORTH);

    // Set up the color chooser panel and attach a change listener so

that
    // color
    // updates get reflected in our preview label.
    colorChooser = new JColorChooser(Color.black);
    colorChooser.getSelectionModel().addChangeListener(
        new ChangeListener() {
          public void stateChanged(ChangeEvent e) {
            updatePreviewColor();
          }
        });
    c.add(colorChooser, BorderLayout.CENTER);

    JPanel previewPanel = new JPanel(new BorderLayout());
    previewLabel = new JLabel("Here's a sample of this font.");
    previewLabel.setForeground(colorChooser.getColor());
    previewPanel.add(previewLabel, BorderLayout.CENTER);

    // Add in the Ok and Cancel buttons for our dialog box
    JButton okButton = new JButton("Ok");
    okButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        closeAndSave();
      }
    });
    JButton cancelButton = new JButton("Cancel");
    cancelButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        closeAndCancel();
      }
    });

    JPanel controlPanel = new JPanel();
    controlPanel.add(okButton);
    controlPanel.add(cancelButton);
    previewPanel.add(controlPanel, BorderLayout.SOUTH);

    // Give the preview label room to grow.
    previewPanel.setMinimumSize(new Dimension(100, 100));
    previewPanel.setPreferredSize(new Dimension(100, 100));

    c.add(previewPanel, BorderLayout.SOUTH);
}

// Ok, something in the font changed, so figure that out and make a
// new font for the preview label
public void actionPerformed(ActionEvent ae) {
    // Check the name of the font
    if (!StyleConstants.getFontFamily(attributes).equals(
        fontName.getSelectedItem())) {
      StyleConstants.setFontFamily(attributes, (String) fontName
          .getSelectedItem());
    }
    // Check the font size (no error checking yet)
    if (StyleConstants.getFontSize(attributes) != Integer.parseInt

(fontSize
        .getText())) {
      StyleConstants.setFontSize(attributes, Integer.parseInt(fontSize
          .getText()));
    }
    // Check to see if the font should be bold
    if (StyleConstants.isBold(attributes) != fontBold.isSelected()) {
      StyleConstants.setBold(attributes, fontBold.isSelected());
    }
    // Check to see if the font should be italic
    if (StyleConstants.isItalic(attributes) != fontItalic.isSelected())

{
      StyleConstants.setItalic(attributes, fontItalic.isSelected());
    }
    // and update our preview label
    updatePreviewFont();
}

// Get the appropriate font from our attributes object and update
// the preview label
protected void updatePreviewFont() {
    String name = StyleConstants.getFontFamily(attributes);
    boolean bold = StyleConstants.isBold(attributes);
    boolean ital = StyleConstants.isItalic(attributes);
    int size = StyleConstants.getFontSize(attributes);

    //Bold and italic don't work properly in beta 4.
    Font f = new Font(name, (bold ? Font.BOLD : 0)
        + (ital ? Font.ITALIC : 0), size);
    previewLabel.setFont(f);
}

// Get the appropriate color from our chooser and update previewLabel
protected void updatePreviewColor() {
    previewLabel.setForeground(colorChooser.getColor());
    // Manually force the label to repaint
    previewLabel.repaint();
}

public Font getNewFont() {
    return newFont;
}

public Color getNewColor() {
    return newColor;
}

public AttributeSet getAttributes() {
    return attributes;
}

public void closeAndSave() {
    // Save font & color information
    newFont = previewLabel.getFont();
    newColor = previewLabel.getForeground();

    // Close the window
    setVisible(false);
}

public void closeAndCancel() {
    // Erase any font information and then close the window
    newFont = null;
    newColor = null;
    setVisible(false);
}

public Font setSelectedFont(Font font) {
JTextArea textarea=null;
// TODO 自动生成方法存根
return textarea.getFont();
}
}
第三步：本项目需要用到7张图片，这7张图片就在下面，从上到下分别为copy.gif、cut.gif、new.gif、

open.gif、paste.gif、save.gif、doit.jpg，这7张图片必须要和kk.class和

FontPicker.class放在同一目录下。最后编译运行成功。

 

 

 

 

 

附图：“项目运行成功后的情况”的图示：