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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，文件的副本将保存在 java 目录中。这仅在按下取消按钮时发生，如果使用保存按钮，文件将在用户选择的位置结束。我怎样才能阻止这种情况的发生，所以当按下取消按钮时，任何地方都不会保存任何东西？

我的代码在下面，感谢所有帮助。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.");
                }
}
4

3 回答 3

2

savePlaylistDialog.showSaveDialog(playlistDialogs);

上面的那个方法调用返回一个int. 您需要检查它的值 - 如果用户单击 Save 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。

于 2012-01-31T12:47:31.767 回答
1

这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.");
    }
}
于 2012-01-31T20:47:41.373 回答
0

showSaveDialog 应该返回用户是否取消并且您的代码应该采取相应的行动。此时，无论用户在保存对话框中做了什么，您都可以保存。

于 2012-01-31T12:48:19.133 回答