Zip Directory 

The following example shows creating a ZIP file out of user given directory. It iterates through all sub directories recursively and updates ZIP entries. The method zipOut.putNextEntry() adds a new file entry to the ZIP file. Remove the drive prefix before making an entry to build the ZIP file in proper format. It handles both empty and non-empty directories. If a ZIP Entry name ends with "/" then its treated as directory entry. So to create a 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/ZipDirectory.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.utils.zip; 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 ZipDirectory {   /**    * @param args    * @throws IOException     */   public static void main(String[] args) throws IOException {     zipDirectory("C:\\NEW2", "C:\\pqr.zip");     System.out.println("Done..");   }   public static void zipDirectory(String srcDir, String tgtZipfile) throws IOException {     File directory = new File(srcDir);          if (!directory.isDirectory()) {       throw new IllegalArgumentException("No such directory :  " + srcDir);     }          System.out.println("Zipping directory : " + srcDir);          /**          * Create ZIP file          */         ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(tgtZipfile));         zipDir(zipOut, directory);         zipOut.close();   }         private static void zipDir(ZipOutputStream zipOut, File directory) {              try {         String [] filePaths = directory.list();           FileInputStream fileInput = null;           byte [] buf = new byte[1024];           String entryName = null;           int index = 0;           File child = null;                      /**            * Add each file as ZIP entry            */           for (int i = 0 ; i < filePaths.length; i++) {             child = new File(directory, filePaths[i]);               entryName = child.getAbsolutePath();               /**                * Remove the drive prefix,                *                 * C:\NEW2\ABC   to NEW2\ABC                * C:\NEW2\file_ops.txt   to NEW2\file_ops.txt                * 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());                            /**              * Zip child directory recursively              */             if (child.isDirectory()) {                 /**                  * Add ZIP directory entry                  */               zipOut.putNextEntry(new ZipEntry(entryName + "/"));               zipOut.closeEntry();                              /**                * Iterate child directory                */               zipDir(zipOut, child);             } else {               /**                * Zip actual file content                */               fileInput = new FileInputStream(child);                                  /**                  * Add ZIP file entry                  */                 zipOut.putNextEntry(new ZipEntry(entryName));                          /**                  * Copy file content to ZIP stream                  */                 int len;                 while ((len = fileInput.read(buf)) > 0) {                   zipOut.write(buf, 0, len);                 }                          fileInput.close();                 zipOut.closeEntry();             }           }              } catch (IOException e) {         e.printStackTrace();       }   } }

Zipping directory : C:\NEW2
Adding : C:\NEW2\AAA\abc.copy.txt
Adding : C:\NEW2\AAA\BIOSinfo.log
Adding : C:\NEW2\AAA\IPC.LOG
Adding : C:\NEW2\AAA\readonly_file.txt
Adding : C:\NEW2\AAA\software.tsv
Adding : C:\NEW2\abc.copy.txt
Adding : C:\NEW2\BIOSinfo.log
Adding : C:\NEW2\CCCC\AAA\abc.copy.txt
Adding : C:\NEW2\CCCC\AAA\BIOSinfo.log
Adding : C:\NEW2\CCCC\AAA\IPC.LOG
Adding : C:\NEW2\CCCC\AAA\readonly_file.txt
Adding : C:\NEW2\CCCC\AAA\software.tsv
Adding : C:\NEW2\CCCC\BIOSinfo.log
Adding : C:\NEW2\CCCC\IPC.LOG
Adding : C:\NEW2\CCCC\readonly_file.txt
Adding : C:\NEW2\file_ops.txt
Adding : C:\NEW2\IPC.LOG
Adding : C:\NEW2\NEW_SUB\BIOSinfo.log
Adding : C:\NEW2\NEW_SUB\IPC.LOG
Adding : C:\NEW2\NEW_SUB\readonly_file.txt
Adding : C:\NEW2\Oracle Identity Manager.txt
Adding : C:\NEW2\readonly_file.txt
Adding : C:\NEW2\software.tsv
Adding : C:\NEW2\test.txt
Done..