Question

求用java语言编写一个记事本程序、

Answer 1

import javax.swing.*;
import javax.swing.undo.*;
import javax.swing.text.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.*;
import java.awt.datatransfer.*;
import java.awt.print.*;
import java.io.*;

public class Jishiben extends JFrame implements ActionListener {
JPopupMenu pm ;
JTextArea ta;
boolean isNewFile=true; //是否新文件(未保存过的)
File currentFile; //当前文件名
String oldValue; //存放编辑区原来的内容,用于比较文本是否有改动
//protected UndoManager undo = new UndoManager();
//protected UndoableEditListener undoHandler = new UndoHandler();
JToolBar tbar = new JToolBar();
JCheckBoxMenuItem mt19;
public Jishiben()
{
super("记事本");
//Container ct=getContentPane();
//以下三句是设置编辑区域及滚动条
ta = new JTextArea();
JScrollPane sp = new JScrollPane(ta);
add(sp);
JMenuBar mb = new JMenuBar();
//设置文件菜单
JMenu mu1 = new JMenu("文件(F)",true);
mu1.setMnemonic('F');//设置快捷键按下ALT+F激活打开菜单

JMenuItem mt1 = new JMenuItem("新建(N)",'N');
mt1.setMnemonic('N');
//mt1.addActionListener(new new1());

JMenuItem mt2 = new JMenuItem("打开(O)...",'O');
mt2.setMnemonic('O');
mt2.addActionListener(this);

JMenuItem mt3 = new JMenuItem("保存(S)",'S');
//mt3.addActionListener(new save());
mu1.add(mt3);

JMenuItem mt4 = new JMenuItem("另存为(A)...");
JMenuItem mt5 = new JMenuItem("页面设置(A)...");
JMenuItem mt6 = new JMenuItem("打印(P)...");

JMenuItem mt7 = new JMenuItem("退出(X)",'X');
//组合键的设置
mt1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,InputEvent.CTRL_MASK)); //新建
mt2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK)); //打开
mt3.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK)); //保存
mt6.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P,InputEvent.CTRL_MASK)); //打印

this.setJMenuBar(mb);
mb.add(mu1);
mu1.add(mt1);
mu1.add(mt2);
mu1.add(mt3);
mu1.add(mt4);
mu1.addSeparator();
mu1.add(mt5);
mu1.add(mt6);
mu1.addSeparator();
mu1.add(mt7);

//设置编辑菜单
JMenu mu2 = new JMenu("编辑(E)",true);
mu2.setMnemonic('E');
JMenuItem mt8 = new JMenuItem("辙稍(U)",'U');
JMenuItem mt9 = new JMenuItem("剪切(T)",'T');
JMenuItem mt10 = new JMenuItem("复制(C)",'C');
JMenuItem mt11 = new JMenuItem("粘贴(P)",'P');
JMenuItem mt12 = new JMenuItem("删除(L)",'L');
JMenuItem mt13 = new JMenuItem("查找(F)",'F');
JMenuItem mt14 = new JMenuItem("查找下一个(N)",'N');
JMenuItem mt15 = new JMenuItem("替换(R)...",'R');
JMenuItem mt16 = new JMenuItem("转到(G)...",'G');
JMenuItem mt17 = new JMenuItem("全选(A)",'A');
JMenuItem mt18 = new JMenuItem("时间/日期(D)",'D');
//组合键的设置
mt8.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Z,InputEvent.CTRL_MASK)); //辙稍
mt9.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK)); //剪切
mt10.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK));//复制
mt11.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK));//粘贴
mt12.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE,0));//删除
mt13.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F,InputEvent.CTRL_MASK));//查找
mt14.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F3,0));//查找下一个
mt15.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_H,InputEvent.CTRL_MASK));//替换
mt16.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_G,InputEvent.CTRL_MASK));//转到
mt17.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,InputEvent.CTRL_MASK));//全选
mt18.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F5,0));//时间/日期

mb.add(mu2);
mu2.add(mt8);
mu2.addSeparator();//分隔线
mu2.add(mt9);
mu2.add(mt10);
mu2.add(mt11);
mu2.add(mt12);
mu2.addSeparator();
mu2.add(mt13);
mu2.add(mt14);
mu2.add(mt15);
mu2.add(mt16);
mu2.addSeparator();
mu2.add(mt17);
mu2.add(mt18);

//设置格式菜单
JMenu mu3 = new JMenu("格式(O)",true);
mu3.setMnemonic('O');
mt19 = new JCheckBoxMenuItem("自动换行(W)");
mt19.setMnemonic('W');
JMenuItem mt20 = new JMenuItem("字体(F)...",'F');
JMenuItem mtys = new JMenuItem("颜色");

mb.add(mu3);
mu3.add(mt19);
mu3.add(mt20);
mu3.add(mtys);

//设置查看菜单
JMenu mu4 = new JMenu("查看(V)",true);
mu4.setMnemonic('V');
JCheckBoxMenuItem mt21 = new JCheckBoxMenuItem("状态栏(S)");
mt21.setMnemonic('S');
mb.add(mu4);
mu4.add(mt21);

//设置帮助菜单
JMenu mu5 = new JMenu("帮助(H)",true);
mu5.setMnemonic('H');
JMenuItem mt22 = new JMenuItem("帮助文档(H)",'H');
JMenuItem mt23 = new JMenuItem("关于记事本(A)",'A');
mt22.addActionListener(this);
mt23.addActionListener(this);

mb.add(mu5);
mu5.add(mt22);
mu5.addSeparator();
mu5.add(mt23);

setVisible(true);
//显示记事本的位置
setBounds(400,200,500,400);

//设置右键菜单
pm = new JPopupMenu();
JMenuItem undo = new JMenuItem("辙销(U)",'U');
JMenuItem cut = new JMenuItem("剪切(T)");
cut.setMnemonic('T');
JMenuItem copy = new JMenuItem("复制(C)",'C');
JMenuItem paste = new JMenuItem("粘贴(P)",'P');
JMenuItem Delete = new JMenuItem("删除(D)",'D');
JMenuItem All = new JMenuItem("全选(A)",'A');
//undo.setEnabled(false);//撤消选项初始设为不可用
ta.add(pm);
ta.addMouseListener(new MouseAdapter(){
public void mouseReleased(MouseEvent e)
{

if(e.isPopupTrigger())
{
pm.show(ta,e.getX(),e.getY());
}
}
public void mousePressed(MouseEvent e)
{
mouseReleased(e);
}

});
pm.add(undo);
pm.addSeparator();
pm.add(cut);
pm.add(copy);
pm.add(paste);
pm.add(Delete);
pm.addSeparator();
pm.add(All);
undo.addActionListener(this);
cut.addActionListener(this);
copy.addActionListener(this);
paste.addActionListener(this);
Delete.addActionListener(this);
All.addActionListener(this);

//系统剪贴板
Toolkit tk = Toolkit.getDefaultToolkit();
Clipboard clipBoard = tk.getSystemClipboard();
}
public static void main(String[] args)
{
new Jishiben();
}
public void actionPerformed(ActionEvent e)
{
if(e.getActionCommand().equals("辙销"))
{

}
if(e.getActionCommand()=="剪切(T)")
{
ta.cut();
}
if(e.getActionCommand().equals("复制(C)"))
{
ta.copy();
}
if(e.getActionCommand().equals("粘贴(P)"))
{
ta.paste();
}
if(e.getSource().equals("自动换行(W)"))
{
if(mt19.getState())
{
ta.setLineWrap(true);
ta.setWrapStyleWord(true);
}
else
{
ta.setLineWrap(false);
ta.setWrapStyleWord(false);
}

}

}

}

Answer 2

import java.awt.*;
import java.awt.event.*;
import java.io.FileReader;
import java.io.FileWriter;
import javax.swing.JFileChooser; import java.awt.*;
import java.awt.event.*;
import java.io.FileReader;
import java.io.FileWriter;
import javax.swing.JFileChooser;
public class TextEditor extends Frame implements ActionListener{
MenuBar mainmenubar=new MenuBar();
Menu file;
MenuItem nw;
MenuItem op;
MenuItem cl;
MenuItem sf;
MenuItem ex;
TextArea tx;
public TextEditor(String title){
super(title);
CloseHandler handler= new CloseHandler();
this.addWindowListener(handler);
setSize(400,400);
setLocationRelativeTo(null);
menuinit();
tx=new TextArea();
this.add(tx);
setVisible(true);
}
void menuinit(){
mainmenubar =new MenuBar();
file=new Menu("File");
nw=new MenuItem("Great");
op=new MenuItem("Open");
cl=new MenuItem("Close");
sf=new MenuItem("save");
ex=new MenuItem("Exit");
file.add(nw);
file.add(op);
file.add(cl);
file.add(sf);
file.add(ex);
mainmenubar.add(file);
setMenuBar(mainmenubar);
nw.addActionListener(this);
op.addActionListener(this);
cl.addActionListener(this);
sf.addActionListener(this);
ex.addActionListener(this);
}
public void actionPerformed(ActionEvent e){
Object ob=e.getSource();
JFileChooser f =new JFileChooser();
if((ob==nw)||(ob==ex)){
tx.setText("write word in here");
}else if(ob==op){
f.showOpenDialog(this);
try{
StringBuffer s=new StringBuffer();
FileReader in=new FileReader(f.getSelectedFile());
while(true){
int b=in.read();
if(b==-1)
break;
s.append((char)b);
}
String myString=s.toString();
char[] mychar=myString.toCharArray();
String unkeyFile =FileEncry(mychar);
tx.setText(unkeyFile.toString());
in.close();
}catch(Exception ee){
}
}else if(ob==sf){
f.showSaveDialog(this);
try{
FileWriter out =new FileWriter(f.getSelectedFile());
String mystr=tx.getText();
char[] strchar=mystr.toCharArray();
String keyFile =FileEncry(strchar);
out.write(keyFile);
out.close();
}catch (Exception ee){
}
}else if(ob==ex)
System.exit(0);
}
public static void main(String[] args){
new TextEditor("Simple TextEdit");
}
public String FileEncry(char[] encry){
StringBuffer str=new StringBuffer();
char[] encry1 =new char[encry.length];
for(int i=0; i<encry.length;i++){
encry1[i]=(char) (encry[i]^'F');
str.append(encry1[i]);
}
return str.toString();
}
}
class CloseHandler extends WindowAdapter{
public void windowClosing(WindowEvent e){
System.exit(0);
}
}