private void zipDir(String dir2zip, ZipOutputStream zos){ 
	    try{
	      File zipDir = new File(dir2zip);
	      String[] dirList = zipDir.list();
	      
	      byte[] readBuffer = new byte[2156];
	      int bytesIn = 0;
	      
	      for (String file : dirList) {
	 
	    	  File f = new File(zipDir, file);
	    	  if (f.isDirectory()) {
	    		  String filePath = f.getPath();
	    		  zipDir(filePath, zos);
	    	  }else{
	    		  
	        	FileInputStream fis = new FileInputStream(f);
	        	ZipEntry anEntry = new ZipEntry(f.getPath());
	        	zos.putNextEntry(anEntry);
	        	while ((bytesIn = fis.read(readBuffer)) != -1) {
	        		zos.write(readBuffer, 0, bytesIn);
	        	}
	        	fis.close();
	    	  }
	      }
	      
	      zos.close();
	      
	    }catch(Exception e){
	    	
	    }}