Find files in zip, jar, war, ear and nested archives

// 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.

import java.io.*;
import java.util.*;
import java.util.zip.*;

public class Finder {
public static void main(String[] args) throws Exception {
String path = args[0];
final String expr = args[1];

List l = new ArrayList();
findFile(new File(path), new P() {
public boolean accept(String t) {
return t.matches(expr) isZip(t);
}
}, l);

List r = new ArrayList();
for (Iterator it = l.iterator(); it.hasNext();) {
File f = (File) it.next();
String fn = f + "";
if (fn.matches(expr)) r.add(fn);
if (isZip(f.getName())) {
findZip(fn, new FileInputStream(f), new P() {
public boolean accept(String t) {
return t.matches(expr);
}
}, r);
}
}

for (Iterator it = r.iterator(); it.hasNext();) {
System.out.println(it.next());
}
}

static void findFile(File f, P p, List r) {
if (f.isDirectory()) {
File[] files = f.listFiles();
for (int i = 0; i < files.length; i++) findFile(files[i], p, r);
} else if (p.accept(f + "")) {
r.add(f);
}
}

static void findZip(String f, InputStream in, P p, List r) throws IOException {
ZipInputStream zin = new ZipInputStream(in);

ZipEntry en;
while ((en = zin.getNextEntry()) != null) {
if (p.accept(en.getName())) r.add(f + "!" + en);
if (isZip(en.getName())) findZip(f + "!" + en, zin, p, r);
}
}

static String[] ZIP_EXTENSIONS = { ".zip", ".jar", ".war", ".ear" };

static boolean isZip(String t) {
for (int i = 0; i < ZIP_EXTENSIONS.length; i++) {
if (t.endsWith(ZIP_EXTENSIONS[i])) {
return true;
}
}
return false;
}

static interface P {
public boolean accept(String t);
}
}