如何将jfilechooser中的文件保存到项目文件夹中？

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

public class FileSaveExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("File Save Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JButton saveButton = new JButton("Save File");
        saveButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JFileChooser fileChooser = new JFileChooser();
                int result = fileChooser.showSaveDialog(frame);
                if (result == JFileChooser.APPROVE_OPTION) {
                    File selectedFile = fileChooser.getSelectedFile();
                    String fileName = selectedFile.getName();
                    String filePath = selectedFile.getParent();

                    String targetFolderPath = "项目文件夹的路径"; // 替换为实际的项目文件夹路径
                    String targetFilePath = targetFolderPath + File.separator + fileName;

                    try {
                        FileInputStream fis = new FileInputStream(selectedFile);
                        FileOutputStream fos = new FileOutputStream(targetFilePath);

                        byte[] buffer = new byte[1024];
                        int length;
                        while ((length = fis.read(buffer)) > 0) {
                            fos.write(buffer, 0, length);
                        }

                        fos.close();
                        fis.close();

                        JOptionPane.showMessageDialog(frame, "文件保存成功！");
                    } catch (IOException ex) {
                        ex.printStackTrace();
                        JOptionPane.showMessageDialog(frame, "文件保存失败！");
                    }
                }
            }
        });

        frame.getContentPane().add(saveButton);
        frame.pack();
        frame.setVisible(true);
    }
}