java :filefilter限制文件类型,如何将Java中的文件选择器限制为特定文件?

最新推荐文章于 2023-04-16 20:51:05 发布

转载最新推荐文章于 2023-04-16 20:51:05 发布 · 677 阅读

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这篇博客探讨了如何在Java中使用JFileChooser进行文件过滤。通过设置FileNameExtensionFilter，实现了只显示特定类型的文件，如PDF、MS Office文档和图片。当用户不是管理员时，仅允许选择这些文件类型；如果是管理员，则可以选择所有文件。博客提供了详细的代码示例来说明如何限制和自定义文件选择器的行为。

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:

}

I am 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.

解决方案

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);

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