public static void main(String args[]) throws IOException {
		String fileName = "./user_data";
		
		bw = new BufferedWriter(new FileWriter(fileName));
		for (int i = 0; i < 10000; i++) {
			StringBuffer sb = new StringBuffer();
			sb.append((i + 1) + ",").append(getRandomString(random, 10000).append("\n").toString());
			bw.write(sb.toString());
		}
		bw.close();
	}