Java GUI - ให้จำ directory ของ file ที่ open ไปล่าสุดและชื่อไฟล์ output เป็นชื่อเดิมแต่เพิ่มข้อความต่อท้าย

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;

public class TestLogFile {
    public static void main(String[] args) throws FileNotFoundException, IOException {
        JFrame.setDefaultLookAndFeelDecorated(true);
        JDialog.setDefaultLookAndFeelDecorated(true);
        JFrame frame = new JFrame("Test Program");
        frame.setPreferredSize(new Dimension(400,400));
        frame.setLayout(new FlowLayout());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JButton button = new JButton("Select File");
        button.addActionListener(new ActionListener() 
    {    
        
        public void actionPerformed(ActionEvent ae) {
            {
        JFileChooser fileChooser = new JFileChooser();
        int returnValue = fileChooser.showOpenDialog(null);
                 if (returnValue == JFileChooser.APPROVE_OPTION) 
                    {
                    try     {
                        File selectedFile = fileChooser.getSelectedFile();
                       readFile(selectedFile.getPath());
                                } catch (FileNotFoundException ex) 
                                    {
                                        Logger.getLogger(TestLogFile.class.getName()).log(Level.SEVERE, null, ex);
                                    } catch (IOException ex) 
                                        {
                                            Logger.getLogger(TestLogFile.class.getName()).log(Level.SEVERE, null, ex);
                                        }
                    }
              }           
        }
                
    }); 
    frame.add(button);
    frame.pack();
    frame.setVisible(true); 
    }
    public static void readFile (String path) throws FileNotFoundException, IOException
    {
        BufferedReader br = new BufferedReader(new FileReader(path));
        String line;

        String[] subLine = new String[6];
        String[] StrBR = new String[8];
        
        PrintWriter writer = new PrintWriter("the-file-name.txt", "UTF-8");

        StrBR[6]="";
          while ((line = br.readLine()) != null) 
            {                   
                
            if(line.contains("changed bitrate: "))
                {
                    
                 StrBR=line.split(" ");
                 float y = Float.parseFloat(StrBR[6]);
                 y=y/1000000;
                 StrBR[6] = Float.toString(y);              
                }
           
            if(line.contains("[CurVideoInfo]"))
                    {
                        subLine=line.split(" ");
                        System.out.println(subLine[3]+" "+subLine[4]+" "+ subLine[5]+ " ,"  + StrBR[6] );
                       writer.println(subLine[3]+" "+subLine[4]+" "+subLine[5] + " ,"  + StrBR[6]+"\n" );
                    }                
            }
writer.close();
br.close();   
//System.exit(0);
}
}