public String getInputString(HttpServletRequest req) {
        String receivedString = "";

        int len = req.getContentLength();
        byte[] input = new byte[len];

        try {
            ServletInputStream sin = req.getInputStream();
            int c = 0;
            int count = 0;
            while ((c = sin.read(input, count, (input.length - count))) > 0) {
                count += 1;
            }
            sin.close();
        } catch (IOException e) {

        }

        receivedString = new String(input);

        return receivedString;
    }