Java FileChooserBuilder不显示在屏幕中央

我目前正在尝试使用Netbeans平台API中的FileChooserBuilder。下面的代码是完整的netbeans模块操作。运行时，它不会显示在窗口/屏幕的中心，而是显示在屏幕左下角的某个位置。是否有可能使此对话框显示在屏幕中间

public final class LoadProjectAction implements ActionListener {

    public void actionPerformed(ActionEvent e) {

        File home = new File(
            System.getProperty("user.home")
            + File.separator + "lib");

        FileChooserBuilder fileChooserBuilder = new FileChooserBuilder(
            LoadProjectAction.class);
        fileChooserBuilder.setTitle("Load project");
        fileChooserBuilder.setDefaultWorkingDirectory(home);
        fileChooserBuilder.setApproveText("Load");
        fileChooserBuilder.setDirectoriesOnly(true);


        File directory = fileChooserBuilder.showOpenDialog();

        if (directory != null) {
            return; // nothing to do
        }

        // do some processing here
    }

}

感谢您的想法。

找到了解决方案：

您必须获得JFileChooser实例，并在其showOpenDialog方法中设置正确的父组件（然后将其相对于应用程序的主窗口进行定位）。但是，由于NetBeans试图非常安全地使用线程—它只允许一个线程访问组件，因此必须使用EventQueue.invokeLater

public final class LoadProjectAction implements ActionListener {

    public void actionPerformed(ActionEvent e) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                // output window
                InputOutput io = IOProvider.getDefault().getIO("File search", true);
                io.select();

                // start in user home directory
                File initialDirectory = new File(
                    System.getProperty("user.home")
                    + File.separator + "lib");

                FileChooserBuilder fileChooserBuilder = new FileChooserBuilder(
                    "LoadProjectAction");
                fileChooserBuilder.setTitle("Load project");
                fileChooserBuilder.setDefaultWorkingDirectory(initialDirectory);
                fileChooserBuilder.setApproveText("Load");
                fileChooserBuilder.setDirectoriesOnly(true);

                JFileChooser jfc = fileChooserBuilder.createFileChooser();
                int value = jfc.showOpenDialog(WindowManager.getDefault().getMainWindow());

                if (value != JFileChooser.APPROVE_OPTION) {
                    return; // nothing to do
                }

                // process selection
            }
        });

    }
}