private StringBuilder readFile(String nomFichier)
    {
        StringBuilder str=new StringBuilder();
        try
        {   BufferedReader br = new BufferedReader(new InputStreamReader(new 
      java.io.FileInputStream(nomFichier), "utf8"));
              String ligne = null;
              
              while ((ligne = br.readLine()) != null)
              {
                  str.append(ligne);
              }
        }catch(Exception err)
        {
            //JOptionPane.showMessageDialog(null,err);
        }
        return str;
    }
    