Création d'un éditeur de texte simple en Java

Question

Comment créer un éditeur de texte comme le Bloc-notes? avec des fonctions comme "Nouveau fichier", "Ouvrir fichier", "Enregistrer le fichier", "mise en forme du texte" en utilisant les éléments graphiques de Java.

Answer 1

Mon projet complet construit dans Eclipse, voici le lien vers Github:

https://github.com/devanshu-netwuk/DevPad-Java-Based-Text-Editor

Answer 2

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

public class Texteditor extends JFrame implements ActionListener 
{ 
      MenuBar mbar; 
      Menu file,edit,format,font,font1,font2; 
      MenuItem item1,item2,item3,item4; 
      MenuItem item5,item6,item7,item8,item9,item10; 
      MenuItem fname1,fname2,fname3,fname4; 
      MenuItem fstyle1,fstyle2,fstyle3,fstyle4; 
      MenuItem fsize1,fsize2,fsize3,fsize4; 

JPanel mainpanel; 
TextArea text; 

Font f; 
String months[]={ 
"Jan","Feb","Mar","Apr", 
"May","Jun","Jul","Aug", 
"Sep","Oct","Nov","Dec"}; 

GregorianCalendar gcalendar; 


String command=" "; 
String str=" "; 

String str1=" ",str2=" ",str3=" "; 
String str4=" "; 

String str6=" "; 
String str7=" ",str8=" ",str9=" "; 

int len1; 

int i=0; 
int pos1; 
int len; 

public Texteditor(String str) 
{ 

super(str); 

mainpanel=new JPanel(); 
mainpanel=(JPanel)getContentPane(); 
mainpanel.setLayout(new FlowLayout()); 


mbar=new MenuBar(); 
setMenuBar(mbar); 

file=new Menu("File"); 
edit=new Menu("Edit"); 
format=new Menu("Format"); 
font=new Menu("Font"); 
font1=new Menu("Font Style"); 
font2=new Menu("Size"); 

file.add(item1=new MenuItem("New...")); 
file.add(item2=new MenuItem("Open")); 
file.add(item3=new MenuItem("Save As...")); 
file.add(item4=new MenuItem("Exit")); 
mbar.add(file); 


edit.add(item5=new MenuItem("Cut (Ctrl+X)")); 
edit.add(item6=new MenuItem("Copy (Ctrl+C)")); 
edit.add(item7=new MenuItem("Paste (Ctrl+V)")); 
edit.add(item8=new MenuItem("Delete")); 
edit.add(item10=new MenuItem("Select All (Ctrl+A)")); 
edit.add(item9=new MenuItem("Time/Date")); 
mbar.add(edit); 

format.add(font); 
format.add(font1); 
format.add(font2); 

font.add(fname1=new MenuItem("Courier")); 
font.add(fname2=new MenuItem("Sans Serif")); 
font.add(fname3=new MenuItem("Monospaced")); 
font.add(fname4=new MenuItem("Symbol")); 

font1.add(fstyle1=new MenuItem("Regular")); 
font1.add(fstyle2=new MenuItem("Bold")); 
font1.add(fstyle3=new MenuItem("Italic")); 
font1.add(fstyle4=new MenuItem("Bold Italic")); 

font2.add(fsize1=new MenuItem("12")); 
font2.add(fsize2=new MenuItem("14")); 
font2.add(fsize3=new MenuItem("18")); 
font2.add(fsize4=new MenuItem("20")); 

mbar.add(format); 



item1.addActionListener(this); 
item2.addActionListener(this); 
item3.addActionListener(this); 
item4.addActionListener(this); 
item5.addActionListener(this); 
item6.addActionListener(this); 
item7.addActionListener(this); 
item8.addActionListener(this); 
item9.addActionListener(this); 
item10.addActionListener(this); 
fname1.addActionListener(this); 
fname2.addActionListener(this); 
fname3.addActionListener(this); 
fname4.addActionListener(this); 
fstyle1.addActionListener(this); 
fstyle2.addActionListener(this); 
fstyle3.addActionListener(this); 
fstyle4.addActionListener(this); 
fsize1.addActionListener(this); 
fsize2.addActionListener(this); 
fsize3.addActionListener(this); 
fsize4.addActionListener(this); 


text=new TextArea(26,60); 
mainpanel.add(text); 

f=new Font("Monotype Corsiva",Font.PLAIN,15); 
text.setFont(f); 
} 




public void actionPerformed(ActionEvent ae) 
{ 


command=(String)ae.getActionCommand(); 

if(command.equals("New...")) 
{ 
dispose(); 
Texteditor note1 = new Texteditor("Untitled-Notepad"); 
note1.setSize(500,500); 
note1.setVisible(true); 
} 

try 
{ 

if(command.equals("Open")) 
{ 

str4=" "; 
FileDialog dialog=new FileDialog(this,"Open"); 
dialog.setVisible(true); 

str1=dialog.getDirectory(); 
str2=dialog.getFile(); 
str3=str1+str2; 
File f=new File(str3); 
FileInputStream fobj=new FileInputStream(f); 
len=(int)f.length(); 
for(int j=0;j<len;j++) 
{ 
char str5=(char)fobj.read(); 
str4=str4 + str5; 

} 

text.setText(str4); 

} 
} 
catch(IOException e) 
{} 


try 
{ 

if(command.equals("Save As...")) 
{ 
FileDialog dialog1=new FileDialog(this,"Save As",FileDialog.SAVE); 
dialog1.setVisible(true); 

str7=dialog1.getDirectory(); 
str8=dialog1.getFile(); 
str9=str7+str8; 


str6=text.getText(); 
len1=str6.length(); 
byte buf[]=str6.getBytes(); 

File f1=new File(str9); 
FileOutputStream fobj1=new FileOutputStream(f1); 
for(int k=0;k<len1;k++) 
{ 
fobj1.write(buf[k]); 
} 
fobj1.close(); 
} 

this.setTitle(str8); 

} 
catch(IOException e){} 



if(command.equals("Exit")) 
{ 
System.exit(0); 
} 

if(command.equals("Cut")) 
{ 
str=text.getSelectedText(); 
i=text.getText().indexOf(str); 
text.replaceRange(" ",i,i+str.length()); 
} 

if(command.equals("Copy")) 
{ 
str=text.getSelectedText(); 
} 

if(command.equals("Paste")) 
{ 
pos1=text.getCaretPosition(); 
text.insert(str,pos1); 
} 
if(command.equals("Delete")) 
{ 
String msg=text.getSelectedText(); 
i=text.getText().indexOf(msg); 
text.replaceRange(" ",i,i+msg.length()); 
} 
if(command.equals("Time/Date")) 
{ 
gcalendar=new GregorianCalendar(); 
String h=String.valueOf(gcalendar.get(Calendar.HOUR)); 
String m=String.valueOf(gcalendar.get(Calendar.MINUTE)); 
String s=String.valueOf(gcalendar.get(Calendar.SECOND)); 
String date=String.valueOf(gcalendar.get(Calendar.DATE)); 
String mon=months[gcalendar.get(Calendar.MONTH)]; 
String year=String.valueOf(gcalendar.get(Calendar.YEAR)); 
String hms="Time"+" - "+h+":"+m+":"+s+" Date"+" - "+date+" "+mon+" "+year; 
int loc=text.getCaretPosition(); 
text.insert(hms,loc); 
} 
if(command.equals("Courier")) 
{ 

String fontName=f.getName(); 
String fontFamily=f.getFamily(); 
int fontSize=f.getSize(); 
int fontStyle=f.getStyle(); 

f=new Font("Courier",fontStyle,fontSize); 
text.setFont(f); 
} 
if(command.equals("Sans Serif")) 
{ 
String fontName=f.getName(); 
String fontFamily=f.getFamily(); 
int fontSize=f.getSize(); 
int fontStyle=f.getStyle(); 

f=new Font("Sans Serif",fontStyle,fontSize); 
text.setFont(f); 
} 
if(command.equals("Monospaced")) 
{ 
String fontName=f.getName(); 
String fontFamily=f.getFamily(); 
int fontSize=f.getSize(); 
int fontStyle=f.getStyle(); 

f=new Font("Monospaced",fontStyle,fontSize); 
text.setFont(f); 
} 

if(command.equals("Symbol")) 
{ 
String fontName=f.getName(); 
String fontFamily=f.getFamily(); 
int fontSize=f.getSize(); 
int fontStyle=f.getStyle(); 

f=new Font("Symbol",fontStyle,fontSize); 
text.setFont(f); 
System.out.println(f.getFamily()); 
} 
if(command.equals("Regular")) 
{ 
String fontName=f.getName(); 
String fontFamily=f.getFamily(); 
int fontSize=f.getSize(); 
int fontStyle=f.getStyle(); 

f=new Font(fontName,Font.PLAIN,fontSize); 
text.setFont(f); 
} 
if(command.equals("Bold")) 
{ 
String fontName=f.getName(); 
String fontFamily=f.getFamily(); 
int fontSize=f.getSize(); 
int fontStyle=f.getStyle(); 

f=new Font(fontName,Font.BOLD,fontSize); 
text.setFont(f); 
} 
if(command.equals("Italic")) 
{ 
String fontName=f.getName(); 
String fontFamily=f.getFamily(); 
int fontSize=f.getSize(); 
int fontStyle=f.getStyle(); 

f=new Font(fontName,Font.ITALIC,fontSize); 
text.setFont(f); 
} 
if(command.equals("Bold Italic")) 
{ 
String fontName=f.getName(); 
String fontFamily=f.getFamily(); 
int fontSize=f.getSize(); 
int fontStyle=f.getStyle(); 

f=new Font(fontName,Font.BOLD|Font.ITALIC,fontSize); 
text.setFont(f); 
} 

if(command.equals("12")) 
{ 
String fontName=f.getName(); 
String fontFamily=f.getFamily(); 
int fontSize=f.getSize(); 
int fontStyle=f.getStyle(); 

f=new Font(fontName,fontStyle,12); 
text.setFont(f); 
} 

if(command.equals("14")) 
{ 
String fontName=f.getName(); 
String fontFamily=f.getFamily(); 
int fontSize=f.getSize(); 
int fontStyle=f.getStyle(); 

f=new Font(fontName,fontStyle,14); 
text.setFont(f); 
} 
if(command.equals("18")) 
{ 
String fontName=f.getName(); 
String fontFamily=f.getFamily(); 
int fontSize=f.getSize(); 
int fontStyle=f.getStyle(); 

f=new Font(fontName,fontStyle,18); 
text.setFont(f); 
} 
if(command.equals("20")) 
{ 
String fontName=f.getName(); 
String fontFamily=f.getFamily(); 
int fontSize=f.getSize(); 
int fontStyle=f.getStyle(); 

f=new Font(fontName,fontStyle,20); 
text.setFont(f); 
} 
if(command.equals("Select All")) 
{ 
String strText=text.getText(); 
int strLen=strText.length(); 
text.select(0,strLen); 
} 


} 

public static void main(String args[]) 
{ 
Texteditor note = new Texteditor("Untitled-Notepad"); 
note.setSize(500,500); 
note.setVisible(true); 
} 
}