inputStream <-> String

inputStream -> String

StringBuffer out = new StringBuffer();
     byte[] b = new byte[4096];
     for (int n; (n = inputStream.read(b)) != -1;) {
         out.append(new String(b, 0, n));
     }
  out.toString();

-------------------------------------------------

String -> inputStream

  InputStream bai = new ByteArrayInputStream(out.toString().getBytes("UTF-8"));