用Java读取多个文件

发布于 2024-12-06 06:20:05 字数 332 浏览 1 评论 0原文

我想一次将多个文件读入Java。文件名如下：

nnnnn_UM2012.txt
ghkjdf_UM2045.txt
erey_UM2189.txt
....

有超过1,000个文件，我不想用Java一一写下所有文件名，使用类似于以下代码的代码：

String fileNames = {"nnnnn_UM2012.txt","ghkjdf_UM2045.txt","erey_UM2189.txt", …}

也许文件名应该以相反的顺序阅读。我怎样才能做到这一点？

原文

I want to read multiple files into Java at once. File names are like:

nnnnn_UM2012.txt
ghkjdf_UM2045.txt
erey_UM2189.txt
....

There are over 1,000 files and I do not want to write all files names in Java one by one, using code similar to the following one:

String fileNames = {"nnnnn_UM2012.txt","ghkjdf_UM2045.txt","erey_UM2189.txt", …}

Maybe the filenames should be read in reverse order. How can I do that?

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想挽留 2024-12-13 06:20:05

获取文件夹中的所有文件（文件列表中包含子文件夹）：

    // get all files in the folder
    final File folder = new File(".");
    final List<File> fileList = Arrays.asList(folder.listFiles());

获取文件夹中的所有文件（不包括子文件夹）：

    // get all files in the folder excluding sub-folders
    final File folder = new File(".");
    final List<File> fileList = Arrays.asList(folder.listFiles(new FileFilter() {
        public boolean accept(File pathname) {
            return pathname.isFile();
        }
    }));

将文件列表按大小写相反的顺序排序：

    // sort the files into reverse order
    Collections.sort(fileList, new Comparator<File>() {
        public int compare(File o1, File o2) {
            return o2.getName().compareTo(o1.getName());
        }
    });

对列表进行排序将文件转换为不区分大小写的反向顺序：

    // sort the files into reverse order ignoring case
    Collections.sort(fileList, new Comparator<File>() {
        public int compare(File o1, File o2) {
            return o2.getName().compareToIgnoreCase(o1.getName());
        }
    });

To get all files in a folder (sub-folders are included in the list of files):

    // get all files in the folder
    final File folder = new File(".");
    final List<File> fileList = Arrays.asList(folder.listFiles());

To get all files in a folder, excluding sub-folders:

    // get all files in the folder excluding sub-folders
    final File folder = new File(".");
    final List<File> fileList = Arrays.asList(folder.listFiles(new FileFilter() {
        public boolean accept(File pathname) {
            return pathname.isFile();
        }
    }));

To sort the list of files into reverse case-sensitive order:

    // sort the files into reverse order
    Collections.sort(fileList, new Comparator<File>() {
        public int compare(File o1, File o2) {
            return o2.getName().compareTo(o1.getName());
        }
    });

To sort the list of files into reverse case-insensitive order:

    // sort the files into reverse order ignoring case
    Collections.sort(fileList, new Comparator<File>() {
        public int compare(File o1, File o2) {
            return o2.getName().compareToIgnoreCase(o1.getName());
        }
    });

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夏夜暖风 2024-12-13 06:20:05

您可以使用 listFiles< /a> 方法获取文件夹中的所有文件。

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单调的奢华 2024-12-13 06:20:05

File rep = new File("path to rep");
File[] list = rep.listFiles();
ArrayList<String> filenames = new ArrayList<String>();
for ( int i = 0; i < list.length; i++) {
    filenames.add(list[i].getName());
}

我想这可以解决你的问题。

File rep = new File("path to rep");
File[] list = rep.listFiles();
ArrayList<String> filenames = new ArrayList<String>();
for ( int i = 0; i < list.length; i++) {
    filenames.add(list[i].getName());
}

I guess it can be a solution to your problem.

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