import  org.jfree.ui.ExtensionFileFilter;

 import  javax.swing.*;

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

 import  java.io.*;


 public   class  choos  extends  JFrame {
    File currentFile;
    JTextArea txt =  new  JTextArea( 10 ,  40 );

     public  choos() {
        txt.setWrapStyleWord(true);
        txt.setLineWrap(true);

        setSize( 500 ,  250 );
        Container c = getContentPane();
        JPanel base =  new  JPanel();
        JPanel p1 =  new  JPanel();
        JPanel p2 =  new  JPanel();
        JButton b1 =  new  JButton("Открыть");
        JButton b2 =  new  JButton("Записать");
        p1.add(b1);
        p1.add(b2);
        base.add(p1);

        JScrollPane scrl =  new  JScrollPane(txt, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        p2.add(scrl);
        base.add(p2);
        c.add(base);

        b1.addActionListener( new  ActionListener() {
             public   void  actionPerformed(ActionEvent e) {
                open();
            }
        });

        WindowListener wndCloser =  new  WindowAdapter() {
             public   void  windowClosing(WindowEvent e) {
                System.exit( 0 );
            }
        };
        addWindowListener(wndCloser);

        setVisible(true);
    }

     public   void  open() {
        JFileChooser fc =  new  JFileChooser();
        fc.setCurrentDirectory( new  File("."));
        ExtFileFilter ff1 =  new  ExtFileFilter("txt", "*.txt — текстовые файлы");
        fc.addChoosableFileFilter(ff1);
        ExtFileFilter ff2 =  new  ExtFileFilter(".doc", "*.doc — документы Word");
        fc.addChoosableFileFilter(ff2);
         if  (fc.showOpenDialog( this ) == JFileChooser.APPROVE_OPTION) {
            currentFile = fc.getSelectedFile();
             try  {
                FileInputStream inF =  new  FileInputStream(currentFile);
                //DataInputStream in = new DataInputStream(inF,"Cp866");
                BufferedReader in =  new  BufferedReader( new  InputStreamReader(inF, "Cp1251"));

                String str = in.readLine();
                in.close();
                txt.append(str + "\n");
            }  catch  (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

     class  ExtFileFilter  extends  javax.swing.filechooser.FileFilter {
        String ext;
        String description;

        ExtFileFilter(String ext, String descr) {
             this .ext = ext;
            description = descr;
        }

         public   boolean  accept(File f) {
             if  (f !=  null ) {
                 if  (f.isDirectory()) {
                     return  true;
                }
                String extension = getExtension(f);
                 if  (extension ==  null )
                     return  (ext.length() ==  0 );
                 return  ext.equals(extension);
            }
             return  false;
        }

         public  String getExtension(File f) {
             if  (f !=  null ) {
                String filename = f.getName();
                 int  i = filename.lastIndexOf('.');
                 if  (i >  0  && i < filename.length() -  1 ) {
                     return  filename.substring(i +  1 ).toLowerCase();
                }
            }
             return   null ;
        }

         public  String getDescription() {
             return  description;
        }
    }

     public   static   void  main(String[] args) {
         new  choos();
    }
    
}

ExtFileFilter ff2 =  new  ExtFileFilter(".doc", "*.doc — документы Word");

ExtFileFilter ff2 =  new  ExtFileFilter("doc", "*.doc — документы Word");

     try  {
        FileInputStream inF =  new  FileInputStream(currentFile);
        //DataInputStream in = new DataInputStream(inF,"Cp866");
        BufferedReader in =  new  BufferedReader( new  InputStreamReader(inF));

        String str = "";
         while  ((str = in.readLine()) !=  null ) {
            txt.append(str + "\n");
        }

        in.close();
    }  catch  (IOException ex) {
        ex.printStackTrace();
    }

Properties