Here is the code I promised in another comment... it isn't quite what I remember but it might get you started.
Essentially you call: String fileName = FileUtils.getFileName(Main.class, "foo.txt");
and it goes and finds that file on disk or in a JAR file. If it is in the JAR file it extracts it to a temp directory. You can then use "new File(fileName)" to open the file which, no matter where it was before, will be on the disk.
What I would do is take a look at the getFile method and look at what you can do with the JAR file to iterate over the contents of it and find the files in a given directory.
Like I said, not exactly what you want, but does do a lot of the initial work for you.
import java.io.Closeable; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.net.URI; import java.net.URISyntaxException; import java.net.URL; import java.net.URLDecoder; import java.security.CodeSource; import java.security.ProtectionDomain; import java.util.zip.ZipEntry; import java.util.zip.ZipException; import java.util.zip.ZipFile; public class FileUtils { public static String getFileName(final Class<?> owner, final String name) throws URISyntaxException, ZipException, IOException { String fileName; final URI uri; try { final String external; final String decoded; final int pos; uri = getResourceAsURI(owner.getPackage().getName().replaceAll("\\.", "/") + "/" + name, owner); external = uri.toURL().toExternalForm(); decoded = external; // URLDecoder.decode(external, "UTF-8"); pos = decoded.indexOf(":/"); fileName = decoded.substring(pos + 1); } catch(final FileNotFoundException ex) { fileName = null; } if(fileName == null || !(new File(fileName).exists())) { fileName = getFileNameX(owner, name); } return (fileName); } private static String getFileNameX(final Class<?> clazz, final String name) throws UnsupportedEncodingException { final URL url; final String fileName; url = clazz.getResource(name); if(url == null) { fileName = name; } else { final String decoded; final int pos; decoded = URLDecoder.decode(url.toExternalForm(), "UTF-8"); pos = decoded.indexOf(":/"); fileName = decoded.substring(pos + 1); } return (fileName); } private static URI getResourceAsURI(final String resourceName, final Class<?> clazz) throws URISyntaxException, ZipException, IOException { final URI uri; final URI resourceURI; uri = getJarURI(clazz); resourceURI = getFile(uri, resourceName); return (resourceURI); } private static URI getJarURI(final Class<?> clazz) throws URISyntaxException { final ProtectionDomain domain; final CodeSource source; final URL url; final URI uri; domain = clazz.getProtectionDomain(); source = domain.getCodeSource(); url = source.getLocation(); uri = url.toURI(); return (uri); } private static URI getFile(final URI where, final String fileName) throws ZipException, IOException { final File location; final URI fileURI; location = new File(where); // not in a JAR, just return the path on disk if(location.isDirectory()) { fileURI = URI.create(where.toString() + fileName); } else { final ZipFile zipFile; zipFile = new ZipFile(location); try { fileURI = extract(zipFile, fileName); } finally { zipFile.close(); } } return (fileURI); } private static URI extract(final ZipFile zipFile, final String fileName) throws IOException { final File tempFile; final ZipEntry entry; final InputStream zipStream; OutputStream fileStream; tempFile = File.createTempFile(fileName.replace("/", ""), Long.toString(System.currentTimeMillis())); tempFile.deleteOnExit(); entry = zipFile.getEntry(fileName); if(entry == null) { throw new FileNotFoundException("cannot find file: " + fileName + " in archive: " + zipFile.getName()); } zipStream = zipFile.getInputStream(entry); fileStream = null; try { final byte[] buf; int i; fileStream = new FileOutputStream(tempFile); buf = new byte[1024]; i = 0; while((i = zipStream.read(buf)) != -1) { fileStream.write(buf, 0, i); } } finally { close(zipStream); close(fileStream); } return (tempFile.toURI()); } private static void close(final Closeable stream) { if(stream != null) { try { stream.close(); } catch(final IOException ex) { ex.printStackTrace(); } } } }
Edit:
Sorry, I don't have time to work on this right now (if I get some I'll do it and post the code here). This is what I would do though:
- Look at the ZipFile class and use the entries() method to find all of the files/directories in the zip file.
- the ZipEntry has an isDirectory() method that you can use to figure out what it is.
- I think the code I posted in this answer will give you a way to pick a temporary directory to extract the contents to.
- I think the code I posted in this answer could help with copying the ZipEntry contents to the file system.
- once the items are on the file system the code you already have for iterating over the directory would still work. You would add a new method to the FileUtils class in the code above and be able to find all of the files as you are doing now.
There is probably a better way to do it, but off the top of my head I think that will work.
