在Java中浏览文件夹的相对路径

Question

I want to modify to browse the folder through the relative path. The code only browse through the absolute path and check only the provided directory is empty or not...plz help....thanks in advance

package fyp;

import java.awt.Color;

public class Frame2 extends JFrame {

private JPanel contentPane;
private JTextField textField;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                Frame2 frame = new Frame2();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });



}

/**
 * Create the frame.
 */
public Frame2() {
    textField = new JTextField();
    textField.setBounds(92, 107, 272, 20);
    setTitle("Plagiarm Detection System\r\n");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 600, 300);
    contentPane = new JPanel();
    contentPane.setBackground(Color.LIGHT_GRAY);
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(null);

    JButton btnBrowse = new JButton("Browse");
    btnBrowse.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                JFileChooser chooser = new JFileChooser();
                chooser.setCurrentDirectory(new java.io.File("."));
                chooser.setDialogTitle("Browse the folder to process");
                chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
                chooser.setAcceptAllFileFilterUsed(true);

               File file=new File("C:/Users/Shahzaib/Desktop/empty");
                //File relative=new File("C:/Users/Shahzaib/Desktop/empty");


               //System.out.println(relative.getName());
               //System.out.println(relative.getPath());


                //File file = new File("directory"); 

                if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) 
                {
                    textField.setText(chooser.getSelectedFile().toString());
                    //System.out.println("getCurrentDirectory(): "+ chooser.getCurrentDirectory());
                    //System.out.println("getSelectedFile() : "+ chooser.getSelectedFile());


                }
                if(file.isDirectory()){

                    if(file.list().length>0){

                        Component frame = null;
                        JOptionPane.showMessageDialog(frame, "Directory is  Not Empty.");

                    }else{

                        Component frame = null;
                        JOptionPane.showMessageDialog(frame, "Directory is Empty.");

                    }


                //else 
                //{
                  // Component frame = null;
                    //JOptionPane.showMessageDialog(frame, "No Selection.");


                }


            }


        });








        getContentPane().add(btnBrowse);
    btnBrowse.setBounds(374, 106, 89, 23);
    contentPane.add(btnBrowse);

    contentPane.add(textField);
    textField.setColumns(10);

    JButton btnProceed = new JButton("Next");
    btnProceed.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            dispose();
            new Frame2().setVisible(true);
        }
    });
    btnProceed.setBounds(485, 227, 89, 23);
    contentPane.add(btnProceed);

    JButton btnBack = new JButton("Cancel");
    btnBack.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            dispose();
            new Frame().setVisible(true);
        }
    });
    btnBack.setBounds(374, 227, 89, 23);
    contentPane.add(btnBack);

    JLabel lblNewLabel = new JLabel("Choose Folder of Assignments");
    lblNewLabel.setFont(new Font("Tahoma", Font.BOLD, 15));
    lblNewLabel.setBounds(180, 11, 235, 50);
    contentPane.add(lblNewLabel);
}

}

Answer 1

When it comes to files usually you at least want to have a try{} and catch{} .

Hints: if you want to find the directory of a file, try file.getParent() or file.getParentFile() . Additionally, you should check to see if the file exists .exists() or isDirectory() .