搜索目录

/: net/mindview/util/Directory.java
// Produce a sequence of File objects that match a
// regular expression in either a local directory,
// or by walking a directory tree.

package net.mindview.util;
 
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Pattern;
 
public final class Directory
{
	public static File[] local(File dir, final String regex)
	{
	    return dir.listFiles(new FilenameFilter() {

	       private Pattern pattern = Pattern.compile(regex);
 
	       public boolean accept(File dir, String name)
	       {
		     return pattern.matcher(new File(name).getName()).matches();
		}
	    });
	}
 
	public static File[] local(String path, final String regex)
	{ 
             // Overloaded
             return local(new File(path), regex);
	}
 
	// A two-tuple for returning a pair of objects:
	public static class TreeInfo implements Iterable<File>
	{
		public List<File> files = new ArrayList<File>();
		public List<File> dirs = new ArrayList<File>();
 
		// The default iterable element is the file list:
		public Iterator<File> iterator()
		{
			return files.iterator();
		}
 
		void addAll(TreeInfo other)
		{
			files.addAll(other.files);
			dirs.addAll(other.dirs);
		}
 
		public String toString()
		{
			return "dirs: " + PPrint.pformat(dirs) + "\n\nfiles: "
					+ PPrint.pformat(files);
		}
	}
 
	public static TreeInfo walk(String start, String regex)
	{ // Begin recursion
		return recurseDirs(new File(start), regex);
	}
 
	public static TreeInfo walk(File start, String regex)
	{ // Overloaded
		return recurseDirs(start, regex);
	}
 
	public static TreeInfo walk(File start)
	{ // Everything
		return recurseDirs(start, ".*");
	}
 
	public static TreeInfo walk(String start)
	{
		return recurseDirs(new File(start), ".*");
	}
 
	static TreeInfo recurseDirs(File startDir, String regex)
	{
		TreeInfo result = new TreeInfo();
		for (File item : startDir.listFiles()) {
			if (item.isDirectory()) {
				result.dirs.add(item);
				result.addAll(recurseDirs(item, regex));
			} else // Regular file
			if (item.getName().matches(regex))
				result.files.add(item);
		}
		return result;
	}
 
	// Simple validation test:
	public static void main(String[] args)
	{
		if (args.length == 0)
			System.out.println(walk("."));
		else
			for (String arg : args)
				System.out.println(walk(arg));
	}
}

注意大师的 walk(String start, String regex) 方法，就是你要的。

start 是要搜索的目录名，比如你的 "c:/WINDOWS"
regex 是过滤条件，是正则表达式，对应你的 "*.txt"

这个大师是 Bruce Eckel