java文本编辑器源码

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

public class TxtEditor extends JFrame implements ActionListener{

String file_name;
String file_dir;
String tempString;
//上次保存后的文件名和地址
String fileName = "";
JPanel x=new JPanel();
JTextArea wen=new JTextArea(20,50);

JMenuItem ziti=new JMenuItem("字体");
JMenuItem a=new JMenuItem("普通");
//定义菜单项
JMenuItem xin=new JMenuItem("新建");
JMenuItem open=new JMenuItem("打开");
JMenuItem save=new JMenuItem("保存 ");
JMenuItem lsave=new JMenuItem("另存为");
JMenuItem tui=new JMenuItem("退出");

JMenuItem cut=new JMenuItem("剪切 ");
JMenuItem copy=new JMenuItem("复制");
JMenuItem cast=new JMenuItem("粘贴");
JMenuItem delete=new JMenuItem("删除 ");

JMenuItem b=new JMenuItem("粗体");
JMenuItem c=new JMenuItem("斜体");
TxtEditor(){
super ("文本编辑器 By 强凯 V1.0");
//小小对话框
setBounds(250,100,700,450);
setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e) {
int option= JOptionPane.showConfirmDialog(
TxtEditor.this, "你真的想退出吗... ", "系统和你对话 ",JOptionPane.YES_NO_OPTION);

if(option==JOptionPane.YES_OPTION)
if(e.getWindow() == TxtEditor.this)
{
System.exit(0);
}
else
{
return;

}
}
});
//热键设置
xin.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,ActionEvent.CTRL_MASK));
open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,ActionEvent.CTRL_MASK));
save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,ActionEvent.CTRL_MASK));
cut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,ActionEvent.CTRL_MASK));
copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,ActionEvent.CTRL_MASK));
cast.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,ActionEvent.CTRL_MASK));

//定义面板
// x.add(
add(new JScrollPane (wen));//);//滚动条
wen.setFont(new Font("楷体" , Font.PLAIN ,20));
// wen.setBackground(Color.blue);
// add(x);

//菜单栏的创建
JMenuBar cai=new JMenuBar();
this.setJMenuBar(cai);
cai.setOpaque(true);
JMenu jian=new JMenu("文件");
jian.add(xin);
jian.add(open);
jian.add(save);
jian.add(lsave);
jian.addSeparator( );
jian.add(tui);
cai.add(jian);

JMenu bian= new JMenu("编辑 ");
bian.add(cut);
bian.add(copy);
bian.add(cast);
bian.add(delete);
cai.add(bian);


JMenu geshi = new JMenu ("格式");
JMenu optionsMenu=new J

Menu("字体");
geshi.add(optionsMenu);
optionsMenu.add(a);
optionsMenu.add(b);
optionsMenu.add(c);
cai.add(geshi);


//增加监听器
xin.addActionListener(this);
open.addActionListener(this);
save.addActionListener(this);
lsave.addActionListener(this);
tui.addActionListener(this);
cut.addActionListener(this);
copy.addActionListener(this);
cast.addActionListener(this);
delete.addActionListener(this);
ziti.addActionListener(this);
a.addActionListener(this);
b.addActionListener(this);
c.addActionListener(this);

// 文本框锁定
//this.setResizable(false);
}


//重写方法
public void actionPerformed(ActionEvent e){

String actionCommand=e.getActionCommand();
if(e.getSource()instanceof JMenu);
{
if(e.getSource()==xin){
newfile();
}

else if(e.getSource()==open){
openfile();
}
else if(e.getSource()==save){
savefile();
}
else if(e.getSource()==lsave){
lsavefile();
}
else if(e.getSource()==cut){
cutfile();
}
else if(e.getSource()==copy){
copyfile();
}
else if(e.getSource()==cast){
castfile();
}
else if(e.getSource()==delete){
deletefile();
}
else if(e.getSource()==a){
afile();
}
else if(e.getSource()==b){
bfile();
}
else if(e.getSource()==c){
cfile();
}
else if("退出".equals(actionCommand))
System.exit(0);

}

}
// 方法定义
public void newfile(){

savefile();
wen.setText(null);
fileName = "";

}
//打开
public void openfile(){
String fileName = null;
FileDialog df = new FileDialog(this,"打开文件",FileDialog.LOAD);
df.setVisible(true);
//建立新文件
File f = new File( df.getDirectory()+df.getFile() );
//得到文件名
fileName = df.getDirectory()+df.getFile();
//用此文件的长度建立一个字符数组 （特别标注）
char ch[] = new char [(int)f.length()];
//异常处理
try
{
//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);
wen.setText(s);
}

//

保存
public void savefile(){
if( fileName.equals("") ){
FileDialog df = new FileDialog(this,"保存文件",FileDialog.SAVE);
df.addWindowListener( new WindowAdapter(){
public void windowClosing(WindowEvent ee){
System.exit(0);
}
});
df.setVisible(true);
String s = wen.getText();

try
{
File f = new File( df.getDirectory()+df.getFile());
fileName = df.getDirectory()+df.getFile();
BufferedWriter bw = new BufferedWriter( new FileWriter (f));
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);
}
}
//如果文件已经保存过
else
{
String s = wen.getText();

try
{
File f = new File( fileName );

BufferedWriter bw = new BufferedWriter( new FileWriter (f));
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
public void lsavefile(){
FileDialog df = new FileDialog(this,"另存为",FileDialog.SAVE);
df.addWindowListener( new WindowAdapter(){
public void windowClosing(WindowEvent ee){
System.exit(0);
}
});
df.setVisible(true);
String s = wen.getText();
try
{
File f = new File( df.getDirectory()+df.getFile());
BufferedWriter bw = new BufferedWriter( new FileWriter (f));
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);
}
}

//剪切
public void cutfile(){

tempString = wen.getSelectedText();
StringBuffer tmp = new StringBuffer ( wen.getText());
int start = wen.getSelectionStart();
int len = wen.getSelectedText().length();
tmp.delete( start , start+len);
wen.setText(tmp.toString());
}

//复制
public void copyfile(){
tempString = wen.getSelectedText();
}

//粘贴
public void castfile(){
StringBuffer tmp = new StringBuffer ( wen.getText());
//得到要粘贴的位置
int start = wen.getSelectionStart();
tmp.insert(start , tempString);
//用新文本设置原文本
wen.setText(tmp.toString());
}

//删除
public void deletefile(){
StringBuffer tmp = new StringBuffer ( wen.getText());
int start = wen.getSelectionStart();
int len = wen.getSelectedText().length();
tmp.delete( start , start+len);
wen.setText(tmp.toString());
}
//字体
public void afile(){
wen.setFont(new Font("楷体", Font.PLAIN ,wen.getFont().getSize()) );//普通文字
}

public void bfile(){
wen.setFont(new Font("楷体" , Font.BOLD ,wen.getFont().getSize()) );//粗体文字

}
public void cfile(){
wen.setFont(new Font("楷体" , Font.ITALIC ,wen.getFont().getSize()) );//斜体文字
}

public static void main(String[] args) {
TxtEditor w=new TxtEditor();
w.pack();
w.setVisible(true);


}