Listing files in directory (and subdirectory)

[Mark Runals]

Hello all,

I have some code that will return file names over a certain character count. What I am trying to do is take that to the next level and have it crawl into subfolders of that directory as well. The problem is I end up with some Frankenstein code that in the end doesn't work. Below is the working, first level of the directory code. Any tips would be great.

import java.io.*;
import java.util.*;
 
public class FileNameLength
{
public static void main(String[] args) throws Exception
{
try
{
String path = "c:/test";
 
File folder = new File(path);
String[] fileList = folder.list();
 
int counter = 0;
for (int i=0;i<fileList.length;i++)
{
if (fileList[i].length()>70)
{
//System.out.println(fileList[i]);
counter++;
}
}
 
System.out.println(counter);
}
catch(Exception e)
{
System.out.println("IOException");
System.out.println(e.getMessage());
e.printStackTrace();
}
}
}    

[ September 28, 2007: Message edited by: Mark Runals ]

[Ulf Dittmer]

What you need is a recursive method that can call itself as it descends into the directory tree. The general structure would be something like this:

crawlDirectory (File fileOrDir) {
 
    if (fileOrDir.isFile())
        doTheFileThing(fileOrDir)
    else
        File[] fileList = fileOrDir.listFiles()
        for (File f : fileList)
            crawlDirectory(f)
 
}

[ September 28, 2007: Message edited by: Ulf Dittmer ]

[Mark Runals]

Sorry I should have been clearer. I understand I need to put in a recursive method. The issue I have is trying to take examples from the web and and modify them or create one myself and have it actually work - thus the Frankenstein code reference.

[Mark Runals]

For posterity here is what I came up with. Am sure there are better ways to do this.

 import java.io.*;
import java.util.*;
 
public class FileNameLengthR2
{
 
List<File> fileSomething = new Vector();
int longNameCounter =0;
int counter =0;
 
String path = "//some_network_path";
int fLength = 125;
 
public FileNameLengthR2()
{
 
}
 
public static void main (String[] args) throws Exception
{
FileNameLengthR2 file = new FileNameLengthR2();
file.getDirectory();
 
}
 
public void getDirectory () throws IOException
{
PrintWriter fileName = new PrintWriter(new FileWriter(fLength + "_FileName.txt"));
PrintWriter filePath = new PrintWriter(new FileWriter(fLength + "_FilePath.txt"));
try
{
File folder = new File(path);
crawlDirectory(folder);
 
System.out.println(longNameCounter + " of " + counter);
for (int i=0;i<fileSomething.size();i++)
{
String st = fileSomething.get(i).getName();
fileName.println(st);
filePath.println(fileSomething.get(i));
fileName.flush();
filePath.flush();
}
}
catch(IOException e)
{
System.err.println(e);
e.printStackTrace();
}
}
 
public List crawlDirectory(File fileOrDir) throws IOException
{
if (fileOrDir.isDirectory())
{
File list[] = fileOrDir.listFiles();
for (int i = 0; i < list.length; i++)
{
File src1 = list[i];
crawlDirectory(src1);
}
}
else
{
counter++;
String file = fileOrDir.getName();
if (file.length()>fLength)
{
//System.out.println(file);
fileSomething.add(fileOrDir);
longNameCounter++;
 
}
}
 
return fileSomething;
 
}
}