@Override
  public void write(EncryptedKeyset keyset) throws IOException {
    outputStream.write(toJson(keyset).toString().getBytes(UTF_8));
    outputStream.write(System.lineSeparator().getBytes(UTF_8));
    outputStream.close();
  }
Static method to create a JsonKeysetWriter that writes to a file path.

<p>This method only works on Android API level 26 or newer.

@deprecated Method should be inlined.
java_src/src/main/java/com/google/crypto/tink/JsonKeysetWriter.java