Java：在指定文件夹中查找 .txt 文件

Java: Find .txt files in specified folder

提问by Sri

Is there a built in Java code that will parse a given folder and search it for .txtfiles?

是否有内置的 Java 代码可以解析给定的文件夹并搜索.txt文件？

采纳答案by djna

You can use the listFiles()method provided by the java.io.Fileclass.

您可以使用类listFiles()提供的方法java.io.File。

import java.io.File;
import java.io.FilenameFilter;

public class Filter {

    public File[] finder( String dirName){
        File dir = new File(dirName);

        return dir.listFiles(new FilenameFilter() { 
                 public boolean accept(File dir, String filename)
                      { return filename.endsWith(".txt"); }
        } );

    }

}

回答by cletus

Try:

尝试：

List<String> textFiles(String directory) {
  List<String> textFiles = new ArrayList<String>();
  File dir = new File(directory);
  for (File file : dir.listFiles()) {
    if (file.getName().endsWith((".txt"))) {
      textFiles.add(file.getName());
    }
  }
  return textFiles;
}

You want to do a case insensitive search in which case:

在这种情况下，您想要进行不区分大小写的搜索：

    if (file.getName().toLowerCase().endsWith((".txt"))) {

If you want to recursively search for through a directory tree for text files, you should be able to adapt the above as either a recursive function or an iterative function using a stack.

如果您想通过目录树递归搜索文本文件，您应该能够将上述内容改编为递归函数或使用堆栈的迭代函数。

回答by Milhous

Here is my platform specific code(unix)

这是我的平台特定代码（unix）

public static List<File> findFiles(String dir, String... names)
    {
        LinkedList<String> command = new LinkedList<String>();
        command.add("/usr/bin/find");
        command.add(dir);
        List<File> result = new LinkedList<File>();
        if (names.length > 1)
            {
                List<String> newNames = new LinkedList<String>(Arrays.asList(names));
                String first = newNames.remove(0);
                command.add("-name");
                command.add(first);
                for (String newName : newNames)
                    {
                        command.add("-or");
                        command.add("-name");
                        command.add(newName);
                    }
            }
        else if (names.length > 0)
            {
                command.add("-name");
                command.add(names[0]);
            }
        try
            {
                ProcessBuilder pb = new ProcessBuilder(command);
                Process p = pb.start();
                p.waitFor();
                InputStream is = p.getInputStream();
                InputStreamReader isr = new InputStreamReader(is);
                BufferedReader br = new BufferedReader(isr);
                String line;
                while ((line = br.readLine()) != null)
                    {
                        // System.err.println(line);
                        result.add(new File(line));
                    }
                p.destroy();
            }
        catch (Exception e)
            {
                e.printStackTrace();
            }
        return result;
    }

回答by ald33

It's really useful, I used it with a slight change:

真的很有用，我稍微改动了一下就使用了：

filename=directory.list(new FilenameFilter() { 
    public boolean accept(File dir, String filename) { 
        return filename.startsWith(ipro); 
    }
});

回答by John Jintire

import org.apache.commons.io.filefilter.WildcardFileFilter;

.........
.........

File dir = new File(fileDir);
FileFilter fileFilter = new WildcardFileFilter("*.txt");
File[] files = dir.listFiles(fileFilter);

The code above works great for me

上面的代码对我很有用

回答by Lokarno

I made my solution based on the posts I found here with Google. And I thought there is no harm to post mine as well even if it is an old thread.

我根据在 Google 上找到的帖子制定了解决方案。而且我认为即使它是旧线程，也可以发布我的帖子没有任何害处。

The only plus this code gives is that it can iterate through sub-directories as well.

这段代码唯一的优点是它也可以遍历子目录。

import java.io.File;
import java.io.FileFilter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.commons.io.filefilter.DirectoryFileFilter;
import org.apache.commons.io.filefilter.WildcardFileFilter;

Method is as follows:

方法如下：

List <File> exploreThis(String dirPath){

    File topDir = new File(dirPath);

    List<File> directories = new ArrayList<>();
    directories.add(topDir);

    List<File> textFiles = new ArrayList<>();

    List<String> filterWildcards = new ArrayList<>();
    filterWildcards.add("*.txt");
    filterWildcards.add("*.doc");

    FileFilter typeFilter = new WildcardFileFilter(filterWildcards);

    while (directories.isEmpty() == false)
    {
        List<File> subDirectories = new ArrayList();

        for(File f : directories)
        {
            subDirectories.addAll(Arrays.asList(f.listFiles((FileFilter)DirectoryFileFilter.INSTANCE)));
            textFiles.addAll(Arrays.asList(f.listFiles(typeFilter)));
        }

        directories.clear();
        directories.addAll(subDirectories);
    }

    return textFiles;
}

回答by Abhi

import org.apache.commons.io.FileUtils;

List htmFileList = new ArrayList();

for (File file : (List) FileUtils.listFiles(new File(srcDir), new String[] { "txt","TXT"}, true)) { htmFileList.add(file); }

导入 org.apache.commons.io.FileUtils;

List htmFileList = new ArrayList();

for (File file : (List) FileUtils.listFiles(new File(srcDir), new String[] { "txt","TXT"}, true)) { htmFileList.add(file); }

This is my latest code to add all text files from a directory

这是我从目录中添加所有文本文件的最新代码

回答by Dragan Menoski

import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.FileVisitResult;
import java.nio.file.Path;
import java.nio.file.PathMatcher;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.ArrayList;

public class FileFinder extends SimpleFileVisitor<Path> {
    private PathMatcher matcher;
    public ArrayList<Path> foundPaths = new ArrayList<>();

    public FileFinder(String pattern) {
        matcher = FileSystems.getDefault().getPathMatcher("glob:" + pattern);
    }

    @Override
    public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
        Path name = file.getFileName();

        if (matcher.matches(name)) {
            foundPaths.add(file);
        }

        return FileVisitResult.CONTINUE;
    }
}

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;

public class Main {
    public static void main(String[] args) throws IOException {
        Path fileDir = Paths.get("files");
        FileFinder finder = new FileFinder("*.txt");
        Files.walkFileTree(fileDir, finder);

        ArrayList<Path> foundFiles = finder.foundPaths;

        if (foundFiles.size() > 0) {
            for (Path path : foundFiles) {
                System.out.println(path.toRealPath(LinkOption.NOFOLLOW_LINKS));
            }
        } else {
            System.out.println("No files were founds!");
        }
    }
}