Upload string to a file on FTP server in Java

Question

I want to put a file to FTP address automatically in a scheduler. I have a JSON object so I can create an XML from this. I can create a xmlString with a code below.

I want to put the XML in the xmlString to a file abc.xml at an FTP address. How I can do it?

private static String objToXml(Object object) throws JAXBException {
    JAXBContext context = JAXBContext.newInstance(object.getClass());
    Marshaller marshallerObj = context.createMarshaller();
    marshallerObj.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
    StringWriter sw = new StringWriter();
    marshallerObj.marshal(object, sw);
    return sw.toString();
}

String xmlString = "";
try {
    xmlString = objToXml(anObject);
} catch (JAXBException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

Answer 1

If I understand your question correctly, you want to store a string to a file on an FTP server.

• Convert your string to an InputStream:
  How do I convert a String to an InputStream in Java?
• and then upload it:
  Uploading byte array to FTP in Java

byte[] bytes = xmlString.getBytes(StandardCharsets.UTF_8);
InputStream inputStream = new ByteArrayInputStream(bytes);
ftpClient.storeFile(remotePath, inputStream);

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Having that said, most XML libraries are be able to write directly to an OutputStream, sparing the necessity (and memory waste) of the intermediate String object.