使用JFileChooser showSaveDialog保存的java文件，即使在“取消”状态下

Question

我保存了一个文件，除了一个问题外，它工作正常。当按下取消按钮时，文件的副本保存在java目录中。仅当按下“取消”按钮时才会发生这种情况，如果使用“保存”按钮，则文件将在用户选择的位置结束。我怎样才能阻止这种情况发生，这样当按下“取消”按钮时，任何地方都不会保存任何内容

下面是我的代码，谢谢大家的帮助。谢谢

    // Save dialog
private void savePlaylist() {
JFileChooser savePlaylistDialog = new JFileChooser();
                savePlaylistDialog.setSelectedFile(new File(newPlaylistNameTxt.getText() + ".txt"));
                savePlaylistDialog.showSaveDialog(playlistDialogs);
                File savePlaylist = savePlaylistDialog.getSelectedFile();

                try {
                    outFile = new PrintWriter(new FileWriter(savePlaylist));
                    outFile.println(newPlaylistInformationTxt.getText());
                    outFile.close();

                    // Plays a sound when play() is called (edited from Bombard)
                    try {
                        Clip saveButtonSound = AudioSystem.getClip();
                        AudioInputStream ais = AudioSystem.getAudioInputStream(new File("Tri-tone.wav"));
                        saveButtonSound.open(ais);
                        saveButtonSound.start();
                    } catch (Exception ex) {
                        ex.printStackTrace();
                    }
                } catch (Exception ex) {
                    JOptionPane.showMessageDialog(null, "File could not be written, try again.");
                }
}

Answer 1

showSaveDialog应返回用户是否已取消，并且您的代码应相应执行。此时，无论用户在“保存”对话框中做了什么，都可以进行保存

Answer 2

savePlaylistDialog.showSaveDialog(playlistDialogs);

上面的方法调用返回一个int。您需要检查它的值-如果用户单击保存按钮，它将返回JFileChooser.ACCEPTED_OPTION。在这种情况下，您将获取返回值（可以接受/保存或取消），忽略它，然后继续将数据写入磁盘

Answer 3

以下是我使用的固定代码：

    // Save dialog
    private void savePlaylist() {
    JFileChooser savePlaylistDialog = new JFileChooser();
    savePlaylistDialog.setSelectedFile(new File(newPlaylistNameTxt.getText() + ".txt"));
    int status = savePlaylistDialog.showSaveDialog(playlistDialogs);

    try {
        if (status == JFileChooser.APPROVE_OPTION) {
            //User has pressed save button

            File savePlaylist = savePlaylistDialog.getSelectedFile();

            outFile = new PrintWriter(new FileWriter(savePlaylist));
            outFile.println(newPlaylistInformationTxt.getText());
            outFile.close();

            // Plays a sound when play() is called (edited from Bombard)
            try {
                Clip saveButtonSound = AudioSystem.getClip();
                AudioInputStream ais = AudioSystem.getAudioInputStream(new File("Tri-tone.wav"));
                saveButtonSound.open(ais);
                saveButtonSound.start();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        } else if (status == JFileChooser.CANCEL_OPTION) {
            // User has pressed cancel button
        }
    } catch (Exception ex) {
        JOptionPane.showMessageDialog(null, "File could not be written, try again.");
    }
}