Java inputStream <-> String

출처: http://childeye.tistory.com/171

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();

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String -> inputStream

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