java: search file according to its name in directory and subdirectories

Question

I need a to find file according to its name in directory tree. And then show a path to this file. I found something like this, but it search according extension. Could anybody help me how can I rework this code to my needs...thanks

public class filesFinder { public static void main(String[] args) { File root = new File("c:\\test"); try { String[] extensions = {"txt"}; boolean recursive = true; Collection files = FileUtils.listFiles(root, extensions, recursive); for (Iterator iterator = files.iterator(); iterator.hasNext();) { File file = (File) iterator.next(); System.out.println(file.getAbsolutePath()); } } catch (Exception e) { e.printStackTrace(); } } }

Could you provide a link to where you found this code from? I'm not sure that FileUtils is part of the Java library, it might be someone else's custom class...never mind, found it, commons.apache.org/io/apidocs/org/apache/commons/io/… — user456814
– user456814, Commented Jun 6, 2011 at 12:11

Udi · Accepted Answer · 2011-06-06 12:52:01Z

public class Test { public static void main(String[] args) { File root = new File("c:\\test"); String fileName = "a.txt"; try { boolean recursive = true; Collection files = FileUtils.listFiles(root, null, recursive); for (Iterator iterator = files.iterator(); iterator.hasNext();) { File file = (File) iterator.next(); if (file.getName().equals(fileName)) System.out.println(file.getAbsolutePath()); } } catch (Exception e) { e.printStackTrace(); } } }

@skaryu - Works for me... Did you add the whole block including the condition?
but there is one problem...I need to find file which has no extension
ok...now it works like this: Collection files = FileUtils.listFiles(root, null, recursive); thanks again
what if I want to find just one file...how should it look without FOR cyclus?

Ernest Friedman-Hill · Accepted Answer · 2011-06-06 12:11:31Z

Recursive directory search in Java is pretty darn easy. The java.io.File class has a listFiles() method that gives all the File children of a directory; there's also an isDirectory() method you call on a File to determine whether you should recursively search through a particular child.

Docs for java.io.file can be found at download.oracle.com/javase/6/docs/api/java/io/File.html

sudmong · Accepted Answer · 2021-05-04 06:14:06Z

You can use FileFilter Like this.

public class MyFileNameFilter implements FilenameFilter { @Override public boolean accept(File arg0, String arg1) { // TODO Auto-generated method stub boolean result =false; if(arg1.startsWith("KB24")) result = true; return result; }

}

And call it like this

File f = new File("C:\\WINDOWS"); String [] files = null; if(f.isDirectory()) { files = f.list(new MyFileNameFilter()); } for(String s: files) { System.out.print(s); System.out.print("\t"); }

Java 8 Lamda make this easier instead of using FileNameFilter, pass lambda expression

 File[] filteredFiles = f.listFiles((file, name) ->name.endsWith(extn));

there is a problem with this: files = f.list(new MyFileNameFilter());
No enclosing instance of type recursiveSearch is accesible. Must qualify the allocation with an enclosing instance of type recursiveSearch
yes...but I don't know what does it mean...I work with java like 10 days :)

Udi · Accepted Answer · 2011-06-06 12:14:24Z

0

I don't really know what FileUtils does, but how about changing "txt" in extenstions to "yourfile.whatever"?

answered Jun 6, 2011 at 12:14

Udi

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1 Comment

user456814 Over a year ago

FileUtils comes from an apache java library, apparently, commons.apache.org/io/apidocs/org/apache/commons/io/…

Mar · Accepted Answer · 2015-05-13 08:34:47Z

public static File find(String path, String fName) { File f = new File(path); if (fName.equalsIgnoreCase(f.getName())) return f; if (f.isDirectory()) { for (String aChild : f.list()) { File ff = find(path + File.separator + aChild, fName); if (ff != null) return ff; } } return null; }

Ousama · Accepted Answer · 2023-09-06 08:17:35Z

Find File in a Directory and Nested Sub-Directories :

import java.io.File; import java.util.Objects; public class Solution_LocateUniverseFormula { public static void main(String[] args) { System.out.println(locateUniverseFormula()); } public static String locateUniverseFormula() { File root = new File("C:/tmp/documents/"); String fileName = "universe-formula"; File[] files = root.listFiles(); for (File childFile : files) { String filePath = find(childFile, fileName); if (!Objects.isNull(filePath)) return filePath; } return null; } public static String find(File file, String fileName) { if (file.getName().startsWith(fileName)) return file.getAbsolutePath(); if (file.isDirectory()) { for (File childFile : file.listFiles()) { String filePath = find(childFile, fileName); if (!Objects.isNull(childFile)) return filePath; } } return null; } }

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