Zip Empty Directory 

The following example shows creating a ZIP file out of user given empty directories. The method zipOut.putNextEntry() adds a new file/directory entry to the ZIP file. Remove the drive prefix before making an entry to build the ZIP file in proper format. If a ZIP Entry name ends with "/" then its treated as directory entry. So to create an empty directory in ZIP file suffix the entry name with "/".

Check the source of ZipEntry.

ZipEntry.java  
public boolean isDirectory()
{
  return this.name.endsWith("/");
}

File Name  :   com/bethecoder/tutorials/utils/zip/ZipEmptyDir.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.utils.zip; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; public class ZipEmptyDir {   /**    * @param args    */   public static void main(String[] args) {     String zipFilePath = "C:\\empty_dirs.zip";     String [] emptyDirs = {                  "C:\\EMPTY\\EMPTY4\\EMPTY5",         "C:\\EMPTY2\\EMPTY6",         "C:\\EMPTY3",         "C:\\EMPTY9"     };          File child = null;     String entryName;     int index = 0;          try {       ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipFilePath));              for (int i = 0 ; i < emptyDirs.length ; i ++) {                      child = new File(emptyDirs[i]);               entryName = child.getAbsolutePath();               /**                * Remove the drive prefix,                *                 * C:\NEW2\ABC   to NEW2\ABC                * C:\NEW2\CCCC\AAA\IPC.LOG to NEW2\CCCC\AAA\IPC.LOG                *                 * If we don't remove the prefix, a directory                * named C: is getting created in the ZIP file.                * To avoid this remove the directory prefix.                */               index = entryName.indexOf(File.separator);               if (index > 0) {                 entryName = entryName.substring(index + 1);               }               System.out.println("Adding : " + child.getAbsolutePath());             /**              * Just add only empty directories              */             if (child.isDirectory() && child.list().length == 0) {                 /**                  * Add ZIP directory entry                  */               zipOut.putNextEntry(new ZipEntry(entryName + "/"));               zipOut.closeEntry();             }       }          /**        * Close Zip stream        */       zipOut.close();       System.out.println("Done..");            } catch (FileNotFoundException e) {       e.printStackTrace();     } catch (IOException e) {       e.printStackTrace();     }   }    }

Adding : C:\EMPTY\EMPTY4\EMPTY5
Adding : C:\EMPTY2\EMPTY6
Adding : C:\EMPTY3
Adding : C:\EMPTY9
Done..