java简单记事本

⑴ 如何用java程序编写一个记事本

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.undo.CannotRedoException;
import javax.swing.undo.UndoManager;
import java.util.Date;
import java.text.SimpleDateFormat;

public class Notepad extends JFrame {
// 菜单
JMenuBar menub = new JMenuBar();
// 显示纯文本的多行区域
JTextArea text = new JTextArea();
JMenu files = new JMenu("文件(F)");
JMenu edit = new JMenu("编辑(E)");
JMenu formats = new JMenu("格式(O)");
JMenu help = new JMenu("帮助(H)");
JMenuItem newFile = new JMenuItem("新建(N)");
JMenuItem open = new JMenuItem("打开(O)");
JMenuItem save = new JMenuItem("保存(S)");
JMenuItem saveAs = new JMenuItem("另存为(A)");
JMenuItem exit = new JMenuItem("退出(X)");
JMenuItem undo = new JMenuItem("撤销(U)");
JMenuItem cut = new JMenuItem("剪切(T)");
JMenuItem = new JMenuItem("复制(C)");
JMenuItem paste = new JMenuItem("粘贴(P)");
JMenuItem selectAll = new JMenuItem("全选(A)");
JMenuItem timeDate = new JMenuItem("时间/日期(D)");
JCheckBoxMenuItem lineWrap = new JCheckBoxMenuItem("自动换行(M)");
JMenuItem fonts = new JMenuItem("字体");
JMenuItem about = new JMenuItem("关于记事本(A)");
JFrame th = this;
String name;
String openedPath = null;
boolean opened = false;
boolean reworked = false;
UndoManager undoManager = new UndoManager();

// 初始化窗体
public Notepad(String name) {
super(name);
this.name = name;
int x, y;
// 得到用户屏幕大小
Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
x = (size.width - 600) / 2;
y = (size.height - 400) / 2;
setSize(600, 400);
// 让程序界面显示在屏幕中央
setLocation(x, y);
// 将此窗口的最小大小设置为一个常量值。
setMinimumSize(new Dimension(250, 150));
setDefaultCloseOperation(EXIT_ON_CLOSE);
}

// 初始化布局
void init() {
files.setMnemonic('F');
edit.setMnemonic('E');
formats.setMnemonic('O');
help.setMnemonic('H');
newFile.setMnemonic('N');
open.setMnemonic('O');
save.setMnemonic('S');
saveAs.setMnemonic('A');
exit.setMnemonic('X');
undo.setMnemonic('U');
cut.setMnemonic('T');
.setMnemonic('C');
paste.setMnemonic('P');
selectAll.setMnemonic('A');
timeDate.setMnemonic('D');
lineWrap.setMnemonic('M');
about.setMnemonic('A');
// 为控件添加助记符
newFile.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,
InputEvent.CTRL_MASK));
open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,
InputEvent.CTRL_MASK));
save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,
InputEvent.CTRL_MASK));
exit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q,
InputEvent.CTRL_MASK));
cut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,
InputEvent.CTRL_MASK));
.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,
InputEvent.CTRL_MASK));
paste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,
InputEvent.CTRL_MASK));
selectAll.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,
InputEvent.CTRL_MASK));
// 为控件添加快捷键
timeDate.setAccelerator(KeyStroke.getKeyStroke("F5"));

files.add(newFile);
files.add(open);
files.add(save);
files.add(saveAs);
files.addSeparator();
files.add(exit);
edit.add(undo);
edit.addSeparator();
edit.add(cut);
edit.add();
edit.add(paste);
edit.addSeparator();
edit.add(selectAll);
edit.add(timeDate);
formats.add(lineWrap);
formats.add(fonts);
help.add(about);

menub.add(files);
menub.add(edit);
menub.add(formats);
menub.add(help);
setJMenuBar(menub);
getContentPane().add(new JScrollPane(text));

Listen listen = new Listen();
Listen1 listen1 = new Listen1();
// 为控件添加事件侦听器
newFile.addActionListener(listen);
undo.addActionListener(listen);
open.addActionListener(listen);
save.addActionListener(listen);
saveAs.addActionListener(listen);
exit.addActionListener(listen);
cut.addActionListener(listen);
.addActionListener(listen);
paste.addActionListener(listen);
selectAll.addActionListener(listen);
timeDate.addActionListener(listen);
lineWrap.addActionListener(listen);
about.addActionListener(listen);
open.addActionListener(listen1);
save.addActionListener(listen1);
saveAs.addActionListener(listen1);
// 暂时没有实现的功能 :设置字体
//undo功能没有实现
fonts.setEnabled(false);

}
class Listen implements ActionListener {
// 实现用于一般操作的事件侦听器
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source == newFile) {
text.setText("");
// 设置标题
th.setTitle(name);
openedPath = null;
opened = false;
} else if (source == exit)
setVisible(false);
else if (source == undo)
try {
//此功能没有实现 撤销要用栈？
// undo.setEnabled(undoManager.canUndo());
undoManager.undo();
} catch (CannotRedoException cre) {
cre.printStackTrace();
}
else if (source == selectAll)
text.selectAll();
else if (source == cut)
text.cut();
else if (source == )
text.();
else if (source == paste)
text.paste();
else if (source == lineWrap)
// 设置文本区的换行策略(获取文本区的换行策略)
text.setLineWrap(!text.getLineWrap());
else if (source == about) {
String message = "--------\n版本：1.0\n作者：时超" +
"\n撤销功能要用堆栈存贮操作" +
"\n还有字体格式"+
"\n暂时没有实现" +
"\n\n感谢您的使用";
JOptionPane.showMessageDialog(th, message, "关于",
JOptionPane.PLAIN_MESSAGE);
} else if (source == timeDate) {
Date nowTime = new Date();
SimpleDateFormat times = new SimpleDateFormat(
"HH:mm yyyy-MM-dd");
text.insert(times.format(nowTime), text.getCaretPosition());
}
}
}
class Listen1 implements ActionListener {
// 实现用于对文件进行操作的事件侦听器
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
// 打开文件事件
if (source == open) {
// 显示对话窗口 以便选择文件
FileDialog openFile = new FileDialog(th, "打开文件",
FileDialog.LOAD);
openFile.setVisible(true);
// 获取文件路径
String filePath = openFile.getDirectory() + openFile.getFile();
try {
FileInputStream fis = new FileInputStream(filePath);
byte[] content = new byte[fis.available()];
fis.read(content);
text.setText(new String(content));
// 设置 TextComponent 的文本插入符的位置
text.setCaretPosition(0);
if (openFile.getFile() != null) {
th.setTitle(openFile.getFile() + name);
openedPath = filePath;
opened = true;
}
fis.close();
} catch (Exception ex) {
ex.printStackTrace();
}
opened = true;
}
// 保存及另存为事件
else if (source == save || source == saveAs) {
String savePath = openedPath;
if (savePath == null || source == saveAs) {
// 如果 mode 的值为 LOAD，那么文件对话框将查找要读取的文件，所显示的文件是当前目录中的文件
// 如果 mode 的值为 SAVE，则文件对话框将查找要写入文件的位置。
FileDialog saveFile = new FileDialog(th, "保存文件",
FileDialog.SAVE);
saveFile.setVisible(true);
savePath = saveFile.getDirectory() + saveFile.getFile();
}
try {
FileOutputStream fos = new FileOutputStream(savePath);
fos.write(text.getText().getBytes());
fos.close();
} catch (Exception ex) {
ex.printStackTrace();
}
if (source == save)
openedPath = savePath;
}
}
}
public static void main(String[] args) {
try {
// 使用当前线程的上下文类加载器加载给定类名称所指定的 LookAndFeel
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
System.err.println("Couldn't use the system look and feel:" + e);
}
String name = ("--记事本 版本1.0--");
Notepad note = new Notepad(name);
note.init();
note.setVisible(true);
}
}

⑵ 用JAVA编个简单的记事本程序

import java.awt.event.*;
import java.awt.*;
import java.io.*;
import java.util.Calendar;
import java.util.Date;
import javax.swing.*;

class Editor extends Frame implements ActionListener,ItemListener
{
// Date date=new Date();
int n1;String str="";int k=0;String st1,st2;
JTextArea ta=new JTextArea(50,50);
Dialog dialog,dialog1;
Choice ce1,ce2,ce3;
Button btn1,btn2,btn3;Panel p1=new Panel();
Panel p2=new Panel();Panel p3=new Panel();Panel p4=new Panel();
public Editor (String s)
{
super ("记事本编辑板");
ImageIcon YouImg = new ImageIcon("iconimage.jpg");
setIconImage(YouImg.getImage());

addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
dispose();
System.exit(0);
}

});
setBounds(50,35,700,500);

MenuBar mb=new MenuBar();
setMenuBar(mb);
Menu file=new Menu("文件(F)");Menu edit=new Menu("编辑(E)");Menu help=new Menu("帮助(H)");
Menu pattern=new Menu("格式(P)");Menu time=new Menu("时间(T)");
MenuItem exit=new MenuItem("退出",new MenuShortcut(KeyEvent.VK_Q));
MenuItem tdate=new MenuItem("日期/时间",new MenuShortcut(KeyEvent.VK_D));
MenuItem renew=new MenuItem("新建", new MenuShortcut(KeyEvent.VK_N));
MenuItem save=new MenuItem("保存", new MenuShortcut(KeyEvent.VK_S));
MenuItem open=new MenuItem("打开",new MenuShortcut(KeyEvent.VK_O));
MenuItem =new MenuItem("复制",new MenuShortcut(KeyEvent.VK_C));
MenuItem paste=new MenuItem("粘贴",new MenuShortcut(KeyEvent.VK_V));
MenuItem cut=new MenuItem("剪切",new MenuShortcut(KeyEvent.VK_X));
MenuItem helptopic=new MenuItem("主题",new MenuShortcut(KeyEvent.VK_T));
helptopic.addActionListener(this);
dialog=new Dialog(this, "字体设置");dialog.setSize(300,300);
dialog1=new Dialog(this, "帮助主题");dialog1.setBounds(250,100,300,400);
dialog.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
dialog.setVisible(false);}
});
dialog1.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
dialog1.setVisible(false);}
});
//dialog.setBackground(Color.WHITE);
dialog.setLayout(null);dialog.setBounds(170,150,450,300);
Label L1=new Label("字体(F)");Label L2=new Label("字形(Y)");
Label L3=new Label("大小(S)");TextArea ta1=new TextArea(5,5);
ta1=new TextArea("至于记事本的主题嘛，因为本人的水平有限, 所有不能为大家作过多的指导，望大家见谅！"); //在这里我想加一个文本框用来放帮助信息。

ce1=new Choice();ce2=new Choice();
ce3=new Choice();
btn1=new Button("确定");btn2=new Button("取消");btn1.addActionListener(this);btn2.addActionListener(this);
btn3=new Button("颜色");
btn3.addActionListener(this);

ce1.add("华文行楷");ce1.add("华文中宋");ce1.add("华文新魏");ce1.add("华文细黑");ce1.add("宋体");ce1.add("方正姚体");
ce1.add("幼圆");ce1.add("隶书");ce1.add("楷体-GB2312");ce1.add("华文行楷");ce1.add("华文彩云");ce1.add("仿宋-GB2312");
ce2.add("粗体");ce2.add("斜体");ce2.add("常规");
for(int n1=0;n1<=100;n1++)
{ce3.add(""+n1);}
dialog.add(p1);p1.setBounds(5,30,440,35);p1.setLayout( null);//p1.setBackground(Color.red);
dialog.add(p2);p2.setBounds(5,65,440,27);dialog.add(p3);p3.setBounds(5,90,440,40);//p4.setBounds(5,120,440,138);
p1.setLayout( null);
p1.add(L1);L1.setBounds(5,15,50,25);p1.add(L2);L2.setBounds(150,15,50,25);
p1.add(L3);L3.setBounds(250,15,50,25);p2.setLayout( null);//p2.setBackground(Color.yellow);
p2.add(ce1);ce1.setBounds(5,0,130,25);p2.add(ce2);ce2.setBounds(160,0,90,25);p2.add(ce3);ce3.setBounds(260,0,75,25);
p2.add(btn1);btn1.setBounds(360,0,75,25);
p3.setLayout( null);p3.add(btn2);btn2.setBounds(360,10,75,25);p3.add(btn3);btn3.setBounds(160,10,75,25);
dialog.add(p4);p4.setBackground(Color.yellow);p4.setBounds(5,120,440,138);
dialog1.add(ta1);
//设置字体的下拉情况
MenuItem Font=new MenuItem("字体");//给字体加监听器
Font.addActionListener(this);
MenuItem Replace=new MenuItem("替换"); MenuItem Seek=new MenuItem("查找");
//首要添加组件的情况
mb.add(file);mb.add(edit);mb.add(pattern);mb.add(time);mb.add(help);
file.add(renew);file.addSeparator();file.add(open);time.add(tdate);
file.addSeparator(); file.add(exit);file.addSeparator();file.add(save);
edit.add(); edit.addSeparator();edit.add(paste);edit.addSeparator();edit.add(cut);
pattern.add(Font); pattern.add(Replace);
pattern.add(Seek);help.add(helptopic);
//给必要的组件加上监听器
renew.addActionListener( this);tdate.addActionListener(this);
open.addActionListener(this); save.addActionListener(this);exit.addActionListener(this);
cut.addActionListener(this);.addActionListener(this);paste.addActionListener(this);
ce1.addItemListener(this);ce2.addItemListener(this);ce3.addItemListener(this);
//添加必要的组件
add(ta,"Center");ta.setBackground(new Color(249,255,234));
setSize(700,500);
setVisible(true);
this.validate() ;

}

public void itemStateChanged(ItemEvent e) {
if (ce2.getSelectedItem().equals("粗体"))
{ k=1;st1=ce1.getSelectedItem();st2=ce3.getSelectedItem();}
if (ce2.getSelectedItem().equals("斜体"))
{ k=2;st1=ce1.getSelectedItem();st2=ce3.getSelectedItem();}
if (ce2.getSelectedItem().equals("常规"))
{ k=3;st1=ce1.getSelectedItem();st2=ce3.getSelectedItem();}
}

public void actionPerformed(ActionEvent e)
{
if(e.getActionCommand().equals("新建"))
{System.out.println("new ");
ta.setText("");}
if(e.getActionCommand().equals("退出"))
{ System.exit(0);}
try
{
if(e.getActionCommand().equals("打开"))
openText();
if(e.getActionCommand().equals("保存"))
saveText();
}catch(IOException e1){}
if(e.getActionCommand().equals("复制"))
{ str=ta.getSelectedText();}
if(e.getActionCommand().equals("粘贴"))
{ ta.insert(str,ta.getCaretPosition());}
if(e.getActionCommand().equals("剪切"))
{str=ta.getSelectedText();ta.replaceRange("",ta.getSelectionStart(),ta.getSelectionEnd());

}
if(e.getActionCommand().equals("字体"))
{dialog.setVisible(true);}
if(e.getActionCommand().equals("主题"))
{dialog1.setVisible(true);}
if(e.getActionCommand().equals("颜色"))
{
Color clr=JColorChooser.showDialog(this,"颜色对话框",null);
ta.setForeground(clr);
}

if(e.getSource()==btn2)
dialog.setVisible(false);
if(e.getSource()==btn1)
{
if(k==1)
{ ta.setFont(new Font(st1,Font.BOLD,Integer.parseInt(st2)));}
if(k==2)
{ ta.setFont(new Font(st1,Font.ITALIC,Integer.parseInt(st2)));}
if(k==3)
{ ta.setFont(new Font(st1,Font.PLAIN,Integer.parseInt(st2)));}
dialog.setVisible(false);
}

//if (e.getActionCommand().equals("日期/时间"))
//ta.setText(ta.getText()+""+date);
if(e.getActionCommand().equals("日期/时间"))
{
Calendar c1 =Calendar.getInstance();
int y = c1.get(Calendar.YEAR);
int m = c1.get(Calendar.MONTH);
int d = c1.get(Calendar.DATE);
int h = c1.get(Calendar.HOUR);
int m1 = c1.get(Calendar.MINUTE);
int m2 = m+1;
ta.setText(ta.getText()+""+(y+"年"+m2+"月"+d+"日"+h+":"+m1));
}

}

public void openText() throws IOException
{
FileDialog fd=new FileDialog(this,"打开文件对话框",FileDialog.LOAD);
fd.setVisible(true);FileInputStream fis=new FileInputStream(fd.getDirectory()+fd.getFile());
ta.setText("");
int n=0;
while((n=fis.read())!=-1)
ta.append(""+(char)n);
fis.close();
}
public void saveText() throws IOException
{
FileDialog fd=new FileDialog(this,"打开文件对话框",FileDialog.SAVE);
fd.setVisible(true);
FileOutputStream out=new FileOutputStream(fd.getDirectory()+fd.getFile()+".txt");
String str=ta.getText();

String str1=ta.getText();
for(int n=0;n<str.length();n++)
out.write((byte)str.charAt(n));
out.close();
}

public static void main(String[] args)
{
Editor f=new Editor(" 记事本程序");
//添加时间代码
Date date=new Date();
System.out.print(date);
/*Calendar now=Calendar.getInstance();
int year=now.get(Calendar.YEAR);
int month=now.get(Calendar.MONTH)+1;
int day=now.get(Calendar.DATE);
System.out.print(year+"年"+month+"月"+day+"日");

int week=now.get(Calendar.DAY_OF_WEEK);
String str="日一二三四五六";//星期1-7
int i=2*(week-1);
System.out.println("星期"+str.substring(i,i+2));//对应中文的下标*/

}

class dialog extends Dialog
{

public dialog()
{
super(dialog, "字体设置");

class Mycanvas extends Canvas
{
Toolkit tk;
Image img;
Mycanvas()
{
setSize(440,138);
tk=getToolkit();
img=tk.getImage("photo.jpg");
}
public void paint(Graphics g)
{
g.drawImage(img,5,120,440,138,this);
}
}
}
}
}