无法使用Java中的JFileChooser保存文件

Question

Iam a java beginner. I have written a simple program to write some contents to a file using showSaveDialoge() in JFileChooser. The code including below.

public static void main(String arg[]) throws IOException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException
    {   
        JFrame frame = new JFrame();
        JFileChooser fc = new JFileChooser();   
        try {
            File file = new File("fileName.txt");
            fc.setSelectedFile(file);
            int r = fc.showSaveDialog(frame);   
            if(r == JFileChooser.APPROVE_OPTION)
            {   
                FileWriter writer = new FileWriter(file);   
                writer.append("Data inside the file");
                writer.flush();
                writer.close();
            }
            else if(r == JFileChooser.CANCEL_OPTION) {
                System.out.println("Do nothing for CANCEL");
            }
        } catch (Exception ex) {
            JOptionPane.showMessageDialog(null, "File could not be written, try again.");
        }
    }

the code gets executed and Save Dialogue box has come. But when I click SAVE button on Dialogue box, nothing had happening. The file has not saved in the selected location. What may be the reason.? Thanks in advance.

Answer 1

What is hapenning is:

you create a File in your current location with name fileName.txt

File file = new File("fileName.txt"); //could be $HOME$/fileName.txt

User selects ProgramFiles/file.txt

but you uses on FileWritter file information, not what user chossed from FileChooser.

change

FileWriter writer = new FileWriter(file);  

to

FileWriter writer = new FileWriter(chooser.getSelectedFile());

Answer 2

Try this:

            FileWriter writer = new FileWriter(fc.getSelectedFile());

It should write to selected file from file chooser.

You were writing to fileName.txt which will be saved in current directory from which you run program.