private static void append( File file, FileFilter filter, int baseNameLen, String addedTopFolder, TarArchiveOutputStream tarOut) throws IOException { String name = file.getAbsolutePath(); if (name.length() <= baseNameLen) name = ""; else name = name.substring(baseNameLen); if (File.separatorChar == '\\') name = name.replace('\\', '/'); if (addedTopFolder != null) name = addedTopFolder + '/' + name; if (FileUtils.isSymlink(file)) { String linkTarget = FileUtils.readSymbolicLink(file); if (linkTarget != null) { TarArchiveEntry entry = new TarArchiveEntry(name, TarConstants.LF_SYMLINK); entry.setName(name); entry.setLinkName(linkTarget); tarOut.putArchiveEntry(entry); } return; } ArchiveEntry entry = tarOut.createArchiveEntry(file, name); tarOut.putArchiveEntry(entry); File[] children = file.listFiles(filter); if (children != null) { tarOut.closeArchiveEntry(); // This is a directory. Append its children for (File child : children) append(child, filter, baseNameLen, addedTopFolder, tarOut); return; } // Append the content of the file InputStream input = new FileInputStream(file); try { StreamUtil.copy(input, tarOut); tarOut.closeArchiveEntry(); } finally { StreamUtil.close(input); } }