Question

我有一个Directory Lister程序，它只是简单地列出了JTable中的目录/子目录/文件，它以递归方式执行此操作（其中一个要求）。有几个条件必须满足（即检查空目录，检查文件夹/文件是否存在等），测试后一切似乎都很好。问题是它确实找到了空目录，但是如果我选择打开一个包含空子目录的目录，每次递归找到它时我的对话框都会打开。我发现的是它显示的元数据（＆＃34;。＆＃34;和＃34; ...＆＃34;文件在我的Linux机器上等于4kb）为空。如果文件夹仅包含那些文件夹，则可以。例如，我的Documents文件夹有＆＃34; 4kb＆＃34;数据，但程序说它是空的。

这是整个过程的两种方法：

    //this method creates the File object, and calls 
    //the method containing the recursive function

    public void showDirectoryContents(String basePath) { 

    try {
        File file = new File(basePath); //creation of File Object
        enumerateDirectory(file); //enumerateDirectory method call
    } catch (Exception e) {}
}
    //The method for all the required File conditions and recursive function

    public void enumerateDirectory(File f) {

    File[] theFiles = f.listFiles();

    String fileType = ""; //This will display as either a "Folder" or a "File" in the JTable

    if(f.isFile())
    {
        fileType = "File";
        gui.updateListing(f.getAbsolutePath(), getSizeString(f.length()), fileType, new Date(f.lastModified()).toString());
    }
    else if(f.isDirectory())
    {
        fileType = "Folder";
        gui.updateListing(f.getAbsolutePath(), getSizeString(f.length()), fileType, new Date(f.lastModified()).toString());
    }
    if(f.isDirectory() && f.list().length == 0) {
        JOptionPane.showConfirmDialog(gui, "That folder is empty.", "OOPS!", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE);
        gui.setAddressLabelText(""); //clear the Address Label so it doesn't show the directory.
        while(gui.tableModel.getRowCount() > 0) {
            for(int i = 0; i < gui.tableModel.getRowCount(); i++) {
                gui.tableModel.removeRow(i); //remove the empty directory from the JTable before the dialog window pops up.
            }
        }
    }

    /*
    This code will remove a non-existent folder/file form the Address Label, and remove it from the JTable.
    Originally, it was listing it on the label and putting a 0 KB file on the Table

    The parameter "gui" in the JOptionPane was created due to the ERROR_MESSAGE popping up on a 2nd monitor if the user has one (the code was tested on dual monitors). This way, it shows up directly in front of the gui.
     */
    if(!f.exists()) {
        try {
            gui.setAddressLabelText("");
            int action = JOptionPane.showConfirmDialog(gui, "That file does not exist.", "ERROR", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE);
            if(action == 0) {
                while (gui.tableModel.getRowCount() > 0) {
                    for (int i = 0; i < gui.tableModel.getRowCount(); i++) {
                        gui.tableModel.removeRow(i);
                    }
                }
            }
        }catch(NullPointerException e) {
            e.getMessage();
        }
    }
    if(f.isDirectory())
    {
        for(int i = 0; i < theFiles.length; i++) {
            enumerateDirectory(theFiles[i]); //recursive function to get all files in specified folder
        }
    }
}

如果目录包含子目录，如何防止显示对话框？是否存在一种方法（用简单的英语）＆＃34;如果文件夹包含子文件夹，请继续迭代＆＃34; ??

我还不熟悉Path类，我还不知道如何使用FileFilter。任何提示/指示将不胜感激。

检查空目录时如何突破递归（Java）

0 个答案: