http://snippets.dzone.com/posts Fri, 25 Jul 2008 07:40:09 GMT DZone Snippets: recursive code http://snippets.dzone.com/posts/show/356 The following java class takes two arguments; a directory name and a regular expression. The directory is searched for files matching the regexp. Zip files (and zip-alikes) are also searched including nested zips. <br /> <br /><code> <br />import java.io.*; <br />import java.util.*; <br />import java.util.zip.*; <br /> <br />public class Finder { <br /> public static void main(String[] args) throws Exception { <br /> String path = args[0]; <br /> final String expr = args[1]; <br /> <br /> List l = new ArrayList(); <br /> findFile(new File(path), new P() { <br /> public boolean accept(String t) { <br /> return t.matches(expr) || isZip(t); <br /> } <br /> }, l); <br /> <br /> List r = new ArrayList(); <br /> for (Iterator it = l.iterator(); it.hasNext();) { <br /> File f = (File) it.next(); <br /> String fn = f + ""; <br /> if (fn.matches(expr)) r.add(fn); <br /> if (isZip(f.getName())) { <br /> findZip(fn, new FileInputStream(f), new P() { <br /> public boolean accept(String t) { <br /> return t.matches(expr); <br /> } <br /> }, r); <br /> } <br /> } <br /> <br /> for (Iterator it = r.iterator(); it.hasNext();) { <br /> System.out.println(it.next()); <br /> } <br /> } <br /> <br /> static void findFile(File f, P p, List r) { <br /> if (f.isDirectory()) { <br /> File[] files = f.listFiles(); <br /> for (int i = 0; i < files.length; i++) findFile(files[i], p, r); <br /> } else if (p.accept(f + "")) { <br /> r.add(f); <br /> } <br /> } <br /> <br /> static void findZip(String f, InputStream in, P p, List r) throws IOException { <br /> ZipInputStream zin = new ZipInputStream(in); <br /> <br /> ZipEntry en; <br /> while ((en = zin.getNextEntry()) != null) { <br /> if (p.accept(en.getName())) r.add(f + "!" + en); <br /> if (isZip(en.getName())) findZip(f + "!" + en, zin, p, r); <br /> } <br /> } <br /> <br /> static String[] ZIP_EXTENSIONS = { ".zip", ".jar", ".war", ".ear" }; <br /> <br /> static boolean isZip(String t) { <br /> for (int i = 0; i < ZIP_EXTENSIONS.length; i++) { <br /> if (t.endsWith(ZIP_EXTENSIONS[i])) { <br /> return true; <br /> } <br /> } <br /> return false; <br /> } <br /> <br /> static interface P { <br /> public boolean accept(String t); <br /> } <br />} <br /> <br /></code> <br /> <br /><em>Files are not properly closed! Don't use this class in a long running application or properly close all streams.</em> Tue, 31 May 2005 22:47:40 GMT http://snippets.dzone.com/posts/show/356 remvee (Remco van 't Veer)