Zip

import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.List; import java.util.zip.Deflater; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream;  public class Packager {     public static void packZip(File output, List<File> sources) throws IOException     {         System.out.println("Packaging to " + output.getName());         ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(output));         zipOut.setLevel(Deflater.DEFAULT_COMPRESSION);          for (File source : sources)         {             if (source.isDirectory())             {                 zipDir(zipOut, "", source);             } else             {                 zipFile(zipOut, "", source);             }         }         zipOut.flush();         zipOut.close();         System.out.println("Done");     }      private static String buildPath(String path, String file)     {         if (path == null || path.isEmpty())         {             return file;         } else         {             return path + "/" + file;         }     }      private static void zipDir(ZipOutputStream zos, String path, File dir) throws IOException     {         if (!dir.canRead())         {             System.out.println("Cannot read " + dir.getCanonicalPath() + " (maybe because of permissions)");             return;         }          File[] files = dir.listFiles();         path = buildPath(path, dir.getName());         System.out.println("Adding Directory " + path);          for (File source : files)         {             if (source.isDirectory())             {                 zipDir(zos, path, source);             } else             {                 zipFile(zos, path, source);             }         }          System.out.println("Leaving Directory " + path);     }      private static void zipFile(ZipOutputStream zos, String path, File file) throws IOException     {         if (!file.canRead())         {             System.out.println("Cannot read " + file.getCanonicalPath() + " (maybe because of permissions)");             return;         }          System.out.println("Compressing " + file.getName());         zos.putNextEntry(new ZipEntry(buildPath(path, file.getName())));          FileInputStream fis = new FileInputStream(file);          byte[] buffer = new byte[4092];         int byteCount = 0;         while ((byteCount = fis.read(buffer)) != -1)         {             zos.write(buffer, 0, byteCount);             System.out.print('.');             System.out.flush();         }         System.out.println();          fis.close();         zos.closeEntry();     } }