Zip a directory including its subdirectories recursively

 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class Main {
  private static void zipDir(String zipFileName, String dir) throws Exception {
    File dirObj = new File(dir);
    ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFileName));
    System.out.println("Creating : " + zipFileName);
    addDir(dirObj, out);
    out.close();
  }

  static void addDir(File dirObj, ZipOutputStream out) throws IOException {
    File[] files = dirObj.listFiles();
    byte[] tmpBuf = new byte[1024];

    for (int i = 0; i < files.length; i++) {
      if (files[i].isDirectory()) {
        addDir(files[i], out);
        continue;
      }
      FileInputStream in = new FileInputStream(files[i].getAbsolutePath());
      System.out.println(" Adding: " + files[i].getAbsolutePath());
      out.putNextEntry(new ZipEntry(files[i].getAbsolutePath()));
      int len;
      while ((len = in.read(tmpBuf)) > 0) {
        out.write(tmpBuf, 0, len);
      }
      out.closeEntry();
      in.close();
    }
  }

  public static void main(String[] args) throws Exception {
    zipDir(args[0], args[1]);
  }
}