Question

import java.io.File;
import java.io.FileFilter;
import java.io.IOException;

public class DirectoryContents
{

    public static void main(String[] args) throws IOException 
    {

        File f = new File("."); 
        FileFilter directoryFilter = new FileFilter()
        {
            public boolean accept(File file)
            {
            return file.isDirectory();
            }
        };

        File[] files = f.listFiles(directoryFilter);
        for (File file : files) 
        {
            if (file.isDirectory()) 
            {
                System.out.print("directory:");
            } 
            else
            {
                System.out.print("     file:");
            }
            System.out.println(file.getCanonicalPath());
        }

    }

}

我能够列出父目录中的所有子目录。但是我想在java.Is中搜索特定的子目录吗？

directory:C:\projects\workspace\testing

如何仅列出子目录（z1）而不是文件？（子目录z1存在于各种子目录中）

directory:C:\projects\workspace\testing\z1
directory:C:\projects\workspace\testing\f5\z1
directory:C:\projects\workspace\testing\f5\a\g\h\d

输出应该是包含z1

的目录

Answer 1

使用Files.walkFileTree，它将以递归方式显示与您父目录对应的子目录。

public static void main(String[] args) throws IOException {
    Path startingDir = Paths
            .get("C:\\projects\\workspace\testing");
    Files.walkFileTree(startingDir, new FindJavaVisitor());
}

private static class FindJavaVisitor extends SimpleFileVisitor<Path> {
     @Override
    public FileVisitResult preVisitDirectory(Path dir, 
                          BasicFileAttributes attrs) throws IOException {
    if(dir.getFileName().toAbsolutePath().toString().contains("z1")){
        System.out.println("z1 is found at"+ dir.getFileName().toAbsolutePath());
    }
      return FileVisitResult.CONTINUE;
    }
}

Answer 2

您可以使用File.listFiles()方法

执行简单的递归功能

  public Collection<File> findDir(File dir, String name) {
    ArrayList<File> result = new ArrayList<File>();
    if(!dir.isDirectory()) return result;
    for(File child : dir.listFiles()) {
      if(child.getName().equals(name)) result.add(child);
      result.addAll(findDir(child, name));
    }
    return result;
  }

假设您要查找z1内的所有C:\projects\workspace\testing目录，请：

Collection<File> result = findDir(new File("C:/projects/workspace/testing"), "z1");

如何从父目录中搜索子目录？

2 个答案: