Welcome to the website of Davis Fiore

First of all you need to pass through all the files. This is accomplished by using the utility class "Files" and calling the mothod "walkFileTree", that requires as a parameter an object that implements FileVisitor. This interface has methods called each time a file or dir is visited.

Then you need to check for a match and this is accomplished with the interface PathMatcher.

Here's an example:

	package org.davis.example;

	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;

	class FileSeeker extends SimpleFileVisitor {
		
		private PathMatcher fileMatcher;
		
		// Initialize the pattern criteria for the search
		public FileSeeker(String pattern) {
			
			try {
				fileMatcher = FileSystems.getDefault().getPathMatcher(pattern);
			}
			catch (IllegalArgumentException iae) {
				System.out.println("The pattern is invalid");
				System.exit(-1);
			}
		}
		
		// Pass here every time a file is visited
		public FileVisitResult visitFile(Path path, BasicFileAttributes attrs) {
			
			// Check if the file match
			if (fileMatcher.matches(path.getFileName()))
				System.out.println("Match found for: " + path.getFileName());
			
			return FileVisitResult.CONTINUE;
		}
		
		// Pass here every time a dir is visited	
		public FileVisitResult preVisitDirectory(Path path, BasicFileAttributes attrs) {
			System.out.println("Searching in... " + path.toAbsolutePath());
			return FileVisitResult.CONTINUE;
		}
	}

	package org.davis.example;

	import java.io.IOException;
	import java.nio.file.Files;
	import java.nio.file.Path;
	import java.nio.file.Paths;

	public class App 
	{		
		public static void main(String[] args) {
			
			// Check parameters
			if (args.length != 2) {
				System.out.println("Syntax: ExamineDir  ");
				System.exit(-1);
			}
			
			// Execute the search
			try {
				
				// Set the dir from which to start the search
				Path src = Paths.get(args[0]);
				
				// Walk through all the files and dirs
				Files.walkFileTree(src, new FileSeeker(args[1]));
			}
			catch (IOException e) {
				System.out.println("An I/O error has occurred!");
			}	
		}
	}

You can use regex or glob pattern.

Here's an example of the parameter passed:

	java ExamineDir C:\mydir regex:fil\w+.\w+

or

	java ExamineDir C:\mydir glob:fil*.*