如何限制JFileChooser选择特定的数字文件? [英] How to constrain JFileChooser to select particular number files?

问题描述

使用JFileChooser，我已通过setMultiSelectionEnabled(true)启用了多选模式，但是如何设置限制以使用户只能选择特定数量的文本(或其他)文件?

public File[] fileSelect() {
    fileChooser = new JFileChooser();
    fileNameExtFilter = new FileNameExtensionFilter("Text File","txt");
    fileChooser.setCurrentDirectory(new java.io.File("."));
    fileChooser.setDialogTitle("Open Question Set");
    fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
    fileChooser.setAcceptAllFileFilterUsed(false);
    fileChooser.setFileFilter(fileNameExtFilter);
    fileChooser.setMultiSelectionEnabled(true);

    if (fileChooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION)
        return fileChooser.getSelectedFiles();
    else
        return null;
}

解决方案

可能有几种方法:

• 创建自定义 FileChooserUI 的子类，并在实现嵌套类SelectionListener的过程中限制选择.

• 创建自定义文件浏览器，如此处所示，并在相关的侦听器中限制选择. /p>

• 使用现有的FileChooser并在选择超过三个时显示一个对话框；请考虑使用包含JTable的复选框，如此处所示.

• 使用单独的选择器面板，如此处所示，用于通过createPathPanel()的两个文件.

最佳选择和确切的细节将取决于用例.

Using JFileChooser, I have enabled multi-selection mode by setMultiSelectionEnabled(true), but how can I set a limit so that the user can only select a particular number of text (or other) files?

public File[] fileSelect() {
    fileChooser = new JFileChooser();
    fileNameExtFilter = new FileNameExtensionFilter("Text File","txt");
    fileChooser.setCurrentDirectory(new java.io.File("."));
    fileChooser.setDialogTitle("Open Question Set");
    fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
    fileChooser.setAcceptAllFileFilterUsed(false);
    fileChooser.setFileFilter(fileNameExtFilter);
    fileChooser.setMultiSelectionEnabled(true);

    if (fileChooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION)
        return fileChooser.getSelectedFiles();
    else
        return null;
}

解决方案

Several approaches are possible:

• Create a custom FileChooserUI by subclassing BasicFileChooserUI and limit the selection in your implementation of the nested class SelectionListener.

• Create a custom file browser, as shown here, and limit the selection in the relevant listener.

• Use the existing FileChooser and present a dialog when the selection exceeds three; consider using a JTable containing checkboxes as shown here.

• Use separate chooser panels, as shown here for two files via createPathPanel().

The best choice and exact details will depend on the use case.

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