求一个用Java编写的文本编辑器代码

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class MyTextEditor extends JFrame implements ActionListener,ItemListener,MouseListener
{
private File file;
private JTextArea textarea;
private JRadioButtonMenuItem rbmi_red,rbmi_blue,rbmi_green;
private JMenuItem menuitem_copy,menuitem_cut,menuitem_paste,menuitem_seek;
private JMenuItem menuitem_song,menuitem_fang,menuitem_kai;//字体变量
private JMenuItem menuitem_normal,menuitem_bold,menuitem_italic;//字形变量
private JMenuItem menuitem_20,menuitem_30,menuitem_40;//字号变量
private JMenuItem menuitem_exit,menuitem_infor;
private JPopupMenu popupmenu;
private JMenuItem menuitem_red,menuitem_green,menuitem_blue;
private JDialog dialog,dialog1;
private JButton button_seek;
private JTextField textfield_seek;
private JLabel label_seek,label_infor;
String seek;

public MyTextEditor()
{
super("文本编辑器");
this.setSize(400,300);
this.setLocation(360,300);
this.setDefaultCloseOperation(HIDE_ON_CLOSE);

Container ss=this.getContentPane();
this.textarea = new JTextArea();
JScrollPane dd=new JScrollPane(textarea);
ss.add(dd);
textarea.addMouseListener(this);
this.addMenu();
this.setVisible(true);
this.Dialog();
this.Dialog1();

this.file = null;
}

public MyTextEditor(String filename)
{
this();
if (filename!=null)
{
this.file = new File(filename);
this.setTitle(filename);
this.textarea.setText(this.readFromFile());
}
}

public MyTextEditor(File file)
{
this();
if (file!=null)
{
this.file = file;
this.setTitle(this.file.getName());
this.textarea.setText(this.readFromFile());
}
}

public void Dialog() //建立对话框的方法
{
dialog=new JDialog(this,"查找",true);
dialog.setLayout(new FlowLayout());
dialog.setSize(200,90);

label_seek=new JLabel("查找内容");
dialog.add(label_seek);

textfield_seek=new JTextField(10);
dialog.add(textfield_seek);

button_seek=new JButton("查找");
dialog.add(button_seek);
button_seek.addActionListener(this);

}
public void Dialog1()
{

dialog1=new JDialog(this,"专利",true);
dialog1.setLayout(new FlowLayout());
dialog1.setSize(200,100);

label_infor=new JLabel("刘同虎制作");
dialog1.add(label_infor);
}

public void addMenu()
{
JMenuBar menubar = new JMenuBar();
this.setJMenuBar(menubar);

JMenu menu_file = new JMenu("文件"); //文件菜单
menubar.add(menu_file);
JMenuItem menuitem_open = new JMenuItem("打开");
menu_file.add(menuitem_open);
menuitem_open.addActionListener(this);

JMenuItem menuitem_save = new JMenuItem("保存");
menu_file.add(menuitem_save);
menuitem_save.addActionListener(this);

JMenuItem menuitem_saveas = new JMenuItem("另存为");
menu_file.add(menuitem_saveas);
menuitem_saveas.addActionListener(this);

menuitem_exit=new JMenuItem("退出" );
menu_file.add(menuitem_exit);
menuitem_exit.addActionListener(this);

menuitem_infor=new JMenuItem("信息");
menu_file.add(menuitem_infor);
menuitem_infor.addActionListener(this);

JMenu menu_editor=new JMenu("编辑");//编辑菜单
menubar.add(menu_editor);

menuitem_seek=new JMenuItem("查找");
menu_editor.add(menuitem_seek);
menuitem_seek.addActionListener(this);

menuitem_copy=new JMenuItem("复制");
menuitem_copy.addActionListener(this);
menu_editor.add(menuitem_copy);

menuitem_cut=new JMenuItem("剪切");
menu_editor.add(menuitem_cut);
menuitem_cut.addActionListener(this);

menuitem_paste=new JMenuItem("粘贴");
menu_editor.add(menuitem_paste);
menuitem_paste.addActionListener(this);

JMenuItem menu_color=new JMenu("颜色");//颜色菜单
menu_editor.add(menu_color);

ButtonGroup buttongroup=new ButtonGroup();
rbmi_red=new JRadioButtonMenuItem("红",true);
buttongroup.add(rbmi_red);
menu_color.add(rbmi_red);
rbmi_red.addItemListener(this);

rbmi_blue=new JRadioButtonMenuItem("蓝",true);
buttongroup.add(rbmi_blue);
menu_color.add(rbmi_blue);
rbmi_blue.addItemListener(this);

rbmi_green=new JRadioButtonMenuItem("绿",true);
buttongroup.add(rbmi_green);
menu_color.add(rbmi_green);
rbmi_green.addItemListener(this);

JMenu menu_font=new JMenu("设置字体");//设置字体菜单
menubar.add(menu_font);

menuitem_song=new JMenuItem("宋体");
menu_font.add(menuitem_song);
menuitem_song.addActionListener(this);

menuitem_fang=new JMenuItem("仿宋");
menu_font.add(menuitem_fang);
menuitem_fang.addActionListener(this);

menuitem_kai=new JMenuItem("楷体");
menu_font.add(menuitem_kai);
menuitem_kai.addActionListener(this);

JMenu menu_style=new JMenu("设置字形");//设置字形菜单
menubar.add(menu_style);

menuitem_bold=new JMenuItem("粗体");
menu_style.add(menuitem_bold);
menuitem_bold.addActionListener(this);

menuitem_italic=new JMenuItem("斜体");
menu_style.add(menuitem_italic);
menuitem_italic.addActionListener(this);

JMenu menu_size=new JMenu("设置字号"); //设置字号菜单
menubar.add(menu_size);

menuitem_20=new JMenuItem("20");
menu_size.add(menuitem_20);
menuitem_20.addActionListener(this);

menuitem_30=new JMenuItem("30");
menu_size.add(menuitem_30);
menuitem_30.addActionListener(this);

menuitem_40=new JMenuItem("40");
menu_size.add(menuitem_40);
menuitem_40.addActionListener(this);

popupmenu=new JPopupMenu(); //快捷菜单
JMenuItem menuitem_red=new JMenuItem("红色");
popupmenu.add(menuitem_red);
menuitem_red.addActionListener(this);

JMenuItem menuitem_green=new JMenuItem("绿色");
popupmenu.add(menuitem_green);
menuitem_green.addActionListener(this);

menuitem_blue=new JMenuItem("蓝色");
popupmenu.add(menuitem_blue);
menuitem_blue.addActionListener(this);

textarea.add(popupmenu); //向文本区内添加快捷菜单

}

public void writeToFile(String lines) //写文件
{
try
{
FileWriter fout = new FileWriter(this.file);
fout.write(lines+"\r\n");
fout.close();
}
catch (IOException ioex)
{
return;
}
}

public String readFromFile() //读文件
{
try
{
FileReader fin = new FileReader(this.file);
BufferedReader bin = new BufferedReader(fin);
String aline="", lines="";
do
{
aline = bin.readLine();
if (aline!=null)
lines += aline + "\r\n";
} while (aline!=null);

bin.close();
fin.close();
return lines;
}
catch (IOException ioex)
{
return null;
}
}本回答被提问者采纳

import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class Notepad /*implements ActionListener , MouseListener , MouseMotionListener , WindowListener , ItemListener , KeyListener, TextListener */
{
//成员变量
private Frame mainFrame;//主框架
private MenuBar mb ; //菜单条
private Menu mFile , mEdit , mFormat , mHelp ; //菜单：文件，编辑，格式，帮助
private MenuItem miNew , miOpen , miSave , miSaveAs , miExit ;//文件菜单项：新建，打开，保存，另存为，退出
private MenuItem miCut , miCopy , miPaste , miDelete ;//编辑菜单项：剪切，复制，粘贴，删除
private MenuItem miFont , miLowtoCapital, miCapitaltoLow ,miEncrypt , miDisencrypt;//格式菜单项：字体
private MenuItem miAboutNotepad;//帮助菜单项：关于记事本

private TextArea ta;//文本区

private String tempString;//临时字符串,用于存储需要复制粘贴的字符串

private boolean textValueChanged = false;

private int id_font ;//字体

String fileName = "";//上次保存后的文件名和地址

//构造函数
public Notepad(){

//框架
mainFrame = new Frame ("Notepad v0.99 by Launching");
mb = new MenuBar ();
ta = new TextArea (30 ,60);
ta.setFont( new Font ( "Times New Rome" , Font.PLAIN , 15));
ta.setBackground(new Color(0 , 250 , 200));

//菜单条
mFile = new Menu ( "File");
mEdit = new Menu ( "Edit");
mFormat = new Menu ("Format");
mHelp = new Menu ("Help");

//"文件"
miNew = new MenuItem ("New");
miOpen = new MenuItem ("Open");
miSave = new MenuItem ("Save");
miSaveAs = new MenuItem ("Save as");
miExit = new MenuItem ("Exit");

//"编辑"
miCut = new MenuItem ("Cut");
miCopy = new MenuItem ("Copy");
miPaste = new MenuItem ("Paste");
miDelete = new MenuItem ("Delete");

//"格式"
miFont = new MenuItem ("Font");
miLowtoCapital = new MenuItem("Low to Capital");
miCapitaltoLow = new MenuItem("Capital to Low");
miEncrypt = new MenuItem("Encrypt");
miDisencrypt = new MenuItem("Disencrypt");

//"帮助"
miAboutNotepad = new MenuItem ("About Notepad");

//添加文件菜单项
mFile.add(miNew);
mFile.add(miOpen);
mFile.add(miSave);
mFile.add(miSaveAs);
mFile.add(miExit);

//添加编辑菜单项
mEdit.add(miCut);
mEdit.add(miCopy);
mEdit.add(miPaste);
mEdit.add(miDelete);

//添加格式菜单项
mFormat.add(miFont);
mFormat.add(miLowtoCapital);
mFormat.add(miCapitaltoLow);
mFormat.add(miEncrypt);
mFormat.add(miDisencrypt);

//添加帮助菜单项
mHelp.add(miAboutNotepad);

//菜单条添加菜单
mb.add(mFile);
mb.add(mEdit);
mb.add(mFormat);
mb.add(mHelp);

//框架添加菜单条
mainFrame.setMenuBar( mb );

//初始字符串赋为空
tempString = "";

//添加文本区
mainFrame.add(ta, BorderLayout.CENTER);

mainFrame.setSize(800 , 500);
mainFrame.setLocation( 100 ,100);// 起始位置
mainFrame.setResizable(true);//不可更改大小
mainFrame.setVisible(true);
//mainFrame.pack();

//////////////////////////////////////////////////////////////////////////////////
////////////////////////////////增加监视器////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////

//主框架
mainFrame.addWindowListener(new WindowAdapter (){ //关闭窗口
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});

//文本区
ta.addKeyListener( new KeyAdapter(){
public void KeyTyped(KeyEvent e){
textValueChanged = true ; //键盘按键按下即导致文本修改
}
});

////////////////"文件"菜单：//////////////////////

//新建
miNew.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){

ta.replaceRange("", 0 , ta.getText().length()) ;//清空文本区的内容

fileName = "";//文件名清空
}
});

//打开
miOpen.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e) {

FileDialog d=new FileDialog(mainFrame , "open file" , FileDialog.LOAD );//打开文件对话框

d.addWindowListener( new WindowAdapter(){ //关闭文件对话框窗口
public void windowClosing(WindowEvent ee){
System.exit(0);
}
});
d.setVisible(true);

File f = new File( d.getDirectory()+d.getFile() ); //建立新文件

fileName = d.getDirectory()+d.getFile();//得到文件名

char ch[] = new char [(int)f.length()];///用此文件的长度建立一个字符数组

try//异常处理
{
//读出数据，并存入字符数组ch中
BufferedReader bw = new BufferedReader( new FileReader(f) );
bw.read(ch);
bw.close();
}
catch( FileNotFoundException fe ){
System.out.println("file not found");
System.exit(0);
}
catch( IOException ie){
System.out.println("IO error");
System.exit(0);
}

String s =new String (ch);

ta.setText(s);//设置文本区为所打开文件的内容
}
});

//保存
miSave.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e) {

if( fileName.equals("") ){ //如果文件没有被保存过,即文件名为空

FileDialog d=new FileDialog(mainFrame , "save file" , FileDialog.SAVE );//保存文件对话框

d.addWindowListener( new WindowAdapter(){ //关闭文件对话框窗口
public void windowClosing(WindowEvent ee){
System.exit(0);
}
});
d.setVisible(true);

String s = ta.getText();//得到所输入的文本内容

try//异常处理
{
File f = new File( d.getDirectory()+d.getFile());//新建文件

fileName = d.getDirectory()+d.getFile();//得到文件名

BufferedWriter bw = new BufferedWriter( new FileWriter (f));//输入到文件中
bw.write(s , 0 , s.length());
bw.close();

}
catch(FileNotFoundException fe_){
System.out.println("file not found");
System.exit(0);
}
catch( IOException ie_)
{
System.out.println(" IO error");
System.exit(0);
}

}

else //如果文件已经保存过
{
String s = ta.getText();//得到所输入的文本内容

try//异常处理
{
File f = new File( fileName );//新建文件

BufferedWriter bw = new BufferedWriter( new FileWriter (f));//输入到文件中
bw.write(s , 0 , s.length());
bw.close();

}
catch(FileNotFoundException fe_){
System.out.println("file not found");
System.exit(0);
}
catch( IOException ie_)
{
System.out.println(" IO error");
System.exit(0);
}

}

}
});

//另存为
miSaveAs.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e) {
FileDialog d=new FileDialog(mainFrame , "save file" , FileDialog.SAVE );//保存文件对话框

d.addWindowListener( new WindowAdapter(){ //关闭文件对话框窗口
public void windowClosing(WindowEvent ee){
System.exit(0);
}
});
d.setVisible(true);

String s = ta.getText();//得到所输入的文本内容

try//异常处理
{
File f = new File( d.getDirectory()+d.getFile());//新建文件

BufferedWriter bw = new BufferedWriter( new FileWriter (f));//输入到文件中
bw.write(s , 0 , s.length());
bw.close();

}
catch(FileNotFoundException fe_){
System.out.println("file not found");
System.exit(0);
}
catch( IOException ie_)
{
System.out.println(" IO error");
System.exit(0);
}
}
});

//退出
miExit.addActionListener( new ActionListener(){ ///退出程序
public void actionPerformed(ActionEvent e){
System.exit(0);
}
});

////////////////"编辑"菜单：////////////////////

//剪切
miCut.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){
tempString = ta.getSelectedText(); ///得到要复制的内容,暂存在tempString中
StringBuffer tmp = new StringBuffer ( ta.getText());//临时存储文本
int start = ta.getSelectionStart(); //得到要删除的字符串的起始位置
int len = ta.getSelectedText().length(); //得到要删除的字符串的长度
tmp.delete( start , start+len); ///删除所选中的字符串
ta.setText(tmp.toString());//用新文本设置原文本
}
});

//复制
miCopy.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){
tempString = ta.getSelectedText(); ///得到要复制的内容,暂存在tempString中
}
});

//粘贴
miPaste.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){
StringBuffer tmp = new StringBuffer ( ta.getText());//临时存储文本
int start = ta.getSelectionStart(); //得到要粘贴的位置
tmp.insert(start , tempString);//查入要粘贴的内容
ta.setText(tmp.toString());//用新文本设置原文本
}
});

//删除
miDelete.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){
StringBuffer tmp = new StringBuffer ( ta.getText());//临时存储文本
int start = ta.getSelectionStart(); //得到要删除的字符串的起始位置
int len = ta.getSelectedText().length(); //得到要删除的字符串的长度
tmp.delete( start , start+len); ///删除所选中的字符串
ta.setText(tmp.toString());//用新文本设置原文本
}
});

////////////////"格式"菜单：////////////////////

//字体
miFont.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){
final Dialog d = new Dialog ( mainFrame , "Font");//新建对话框
d.setLocation( 250 ,250);// 起始位置

d.setLayout( new BorderLayout());//表格布局

//////////////////////////上部分面板
Label l_font = new Label ("font");//font标签
Panel p_1 = new Panel();
p_1.add(l_font);
p_1.setVisible(true);

//////////////////////////中部分面板
List font_list = new List (6 , false);//字体列表

//添加字体项目
font_list.add("Plain");///普通字体
font_list.add("Bold"); ///粗体
font_list.add("Italic");//斜体

font_list.addItemListener( new MyItemListener_font() ); //字体增加监视器

Panel p_2 = new Panel();
p_2.add(font_list);
p_2.setVisible(true);

//////////////////////////下部分面板
Button ok = new Button ("OK");
ok.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){
d.dispose();
}
});
ok.setSize( new Dimension (20 , 5) );

Panel p_3 = new Panel();//下部分面板
p_3.add(ok);
p_3.setVisible(true);

//添加三个面板
d.add(p_1 , BorderLayout.NORTH);
d.add(p_2 , BorderLayout.CENTER);
d.add(p_3 , BorderLayout.SOUTH);
d.pack();

d.addWindowListener( new WindowAdapter(){ //关闭对话框窗口
public void windowClosing(WindowEvent ee){
d.dispose();
}
});

d.setVisible(true);
}
});

//小写字母转大写
miLowtoCapital.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){
String s = ta.getText();//得到所输入的文本内容
StringBuffer temp = new StringBuffer("");
for(int i = 0 ; i<s.length() ; i++){
if((int)s.charAt(i)>=97 && (int)s.charAt(i)<=122 ){
temp.append((char)((int)s.charAt(i)-32));
}
else
temp.append(s.charAt(i));
}
s = new String(temp);
ta.setText(s);
}
});

//大写字母转小写
miCapitaltoLow.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){
String s = ta.getText();//得到所输入的文本内容
StringBuffer temp = new StringBuffer("");
for(int i = 0 ; i<s.length() ; i++){
if((int)s.charAt(i)>=65 && (int)s.charAt(i)<=90 ){
temp.append((char)((int)s.charAt(i)+32));
}
else
temp.append(s.charAt(i));
}
s = new String(temp);
ta.setText(s);
}
});

//加密
miEncrypt.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){
String s = ta.getText();//得到所输入的文本内容
StringBuffer temp = new StringBuffer("");
for(int i = 0 ; i<s.length() ; i++){
if(s.charAt(i)>=40 && s.charAt(i)<=125){
if(i%2==0){
temp.append((char)(s.charAt(i) + 1 ));
}
else
temp.append((char)(s.charAt(i) - 1 ));
}
else
temp.append(s.charAt(i));

}
s = new String(temp);
ta.setText(s);
}
});

//解密
miDisencrypt.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){
String s = ta.getText();//得到所输入的文本内容
StringBuffer temp = new StringBuffer("");
for(int i = 0 ; i<s.length() ; i++){
if(s.charAt(i)>=40 && s.charAt(i)<=125){
if(i%2==0){
temp.append((char)(s.charAt(i) - 1 ));
}
else
temp.append((char)(s.charAt(i) + 1 ));
}
else
temp.append(s.charAt(i));
}
s = new String(temp);
ta.setText(s);
}
});

////////////////"帮助"菜单：////////////////////

//关于记事本
miAboutNotepad.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){
final Dialog d = new Dialog ( mainFrame , "AboutNotepad");//新建对话框
TextArea t = new TextArea("\nwelcome to use Notepad " + "\n\n" + "Copyright@Launching " + "\n\n" + "free software" + "\n\n" + "v0.99");//添加标签
t.setSize( new Dimension ( 5 , 5));
t.setEditable(false);
d.setResizable(false);//不可调整大小
d.add(t);
d.pack();

d.addWindowListener( new WindowAdapter(){ //关闭对话框窗口
public void windowClosing(WindowEvent ee){
d.dispose();
}
});
d.setLocation( 100 ,250);// 起始位置
d.setVisible(true);
}
});

}

class MyItemListener_font implements ItemListener { //字体监听器
public void itemStateChanged(ItemEvent e) {
id_font = ((java.awt.List)e.getSource()).getSelectedIndex();
switch( id_font){
case 0:{
ta.setFont(new Font("Times New Roman", Font.PLAIN ,ta.getFont().getSize()) );//普通文字
break;
}
case 1:{
ta.setFont(new Font("Times New Roman" , Font.BOLD ,ta.getFont().getSize()) );//粗体文字
break;
}
case 2:{
ta.setFont(new Font("Times New Roman" , Font.ITALIC ,ta.getFont().getSize()) );//斜体文字
break;
}
}
}
}

/////////////////////////////////////////主函数///////////////////////////////////////////////////
public static void main(String arg[]){
Notepad test = new Notepad(); ///创建记事本
}
//////////////////////////////////////////////////////////////////////////////////////////////////
}