JFileChooser.showOpenDialog()冻结我的程序

时间:2014-05-13 23:15:20

标签: java swing file-io jfilechooser

我的JFileChooser课程有问题。我使用下面的类(我写的)一个接一个地加载几个文件,它通常适用于2或3个文件(有时1个,有时6个,看起来是随机的,即使它一定不是)并且在某一点上,它冻结在showOpenDialog(null),没有异常被抛出,也没有任何返回。 我真的不知道它来自哪里。

这是我的班级:

public class CustomFileChooser extends JFileChooser {

    public File chooseFile(String windowTitle, String description, String extension, boolean mustExist) {

        setDialogTitle(windowTitle);
        resetChoosableFileFilters();
        setAcceptAllFileFilterUsed(false);
        addChoosableFileFilter(new CustomFileFilter(description, new String[] {extension}));
        setSelectedFile(new File(""));

        if (mustExist) {
            setApproveButtonText("Open");
        } else {
            setApproveButtonText("Save");
        }

        File file = null;
        while (file == null) {

            if (showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {

                file = getSelectedFile();
                if (mustExist) {
                    if (!file.canRead()) {
                        file = null;
                        JOptionPane.showMessageDialog(null, "Cannot read from the specified file!", "Error while opening the file", JOptionPane.ERROR_MESSAGE);
                    }
                } else {
                    if (!file.getName().toLowerCase().endsWith(extension.toLowerCase())) {
                        file = new File(file.getAbsolutePath().concat(extension));
                    }
                    if (file.exists()) {
                        if (file.canWrite()) {
                            if (JOptionPane.showConfirmDialog(null, "Do you really want to overwrite this file?", "Erasing file", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE) == JOptionPane.NO_OPTION) {
                                file = null;
                            }
                        } else {
                            file = null;
                            JOptionPane.showMessageDialog(null, "Cannot write to the specified file!", "Error while opening the file", JOptionPane.ERROR_MESSAGE);
                        }
                    }
                }
            } else {
                return null;
            }
        }

        return file;
    }

    private static final long serialVersionUID = 1L;
}
编辑:我尝试在Windows上运行我的程序,一切正常。您是否了解与此类/方法有关的平台相关问题?

1 个答案:

答案 0 :(得分:0)

在下面的代码块中使用您的代码。

private void fileChooserMethod() {
    EventQueue.invokeLater(new Runnable() {
        @Override
        public void run() {
           javax.swing.JFileChooser fc_file_selector= new JFileChooser();
           int response =  fc_file_selector.showOpenDialog(null);
           //your code here
        }
    });
}