如何将java中的文件选择器限制为特定文件 [英] How to restrict file choosers in java to specific files

问题描述

private void openMenuActionPerformed(java.awt.event.ActionEvent evt) {

    DBmanager db = new DBmanager();
    if (!db.getCurrentUser().equals("Admin")) {
        JOptionPane.showMessageDialog(this, "You are Not Allowed to Run Applications");
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
        fileChooser.addChoosableFileFilter(new FileNameExtensionFilter("PDF Documents", "pdf"));
        fileChooser.addChoosableFileFilter(new FileNameExtensionFilter("MS Office Documents", "docx", "xlsx", "pptx"));
        fileChooser.addChoosableFileFilter(new FileNameExtensionFilter("Images", "jpg", "png", "gif", "bmp"));
        fileChooser.setAcceptAllFileFilterUsed(false);
        int returnVal = fileChooser.showOpenDialog(this);

        if (returnVal == JFileChooser.APPROVE_OPTION) {
            File file = fileChooser.getSelectedFile();

            if (Desktop.isDesktopSupported()) {
                try {
                    Desktop.getDesktop().open(file);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    } else if (db.getCurrentUser().equals("Admin")) {
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setAcceptAllFileFilterUsed(true);
        int returnVal = fileChooser.showOpenDialog(this);
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            File file = fileChooser.getSelectedFile();
            if (Desktop.isDesktopSupported()) {
                try {
                    Desktop.getDesktop().open(file);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }// TODO add your handling code here:
}

大家好....我试图通过设置 fileChooser.setAcceptAllFileFilterUsed（false）来过滤文件过滤器中的文件; 。 所有文件选项从 FileChooser 中消失，但除非您从PDF文档，ms Office或图像中选择一个选项，否则所有文件仍然可见。我希望只有我的3个自定义打开文件选择器时过滤。

Hi guys....I'm trying to filter files in a file filter by setting fileChooser.setAcceptAllFileFilterUsed(false);. The "all files" option disappears from the FileChooser but all files remain visible unless you select an option from PDF documents,ms Office or images.I want to have only my 3 custom filters upon opening the file chooser.

推荐答案

例如，如果您想严格过滤 JFileChooser 显示最常见的图像文件，您可以使用以下内容：

For example, if you want to filter your JFileChooser to strictly display most commonly found image files, you would use something like this:

FileNameExtensionFilter filter = new FileNameExtensionFilter("Image Files", "jpg", "png", "gif", "jpeg");
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileFilter(filter);

第一个参数是描述（在底部选择时显示的内容），第二个参数是非正式的文件扩展名。

The first argument is the description (what gets displayed upon selection at the bottom) and the second argument are the informal file extensions.

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