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Saving DOMSource object created into a folder in SFTP Server in Java

I need to save the newly created DOMSource object as new XML file into a folder inside the SFTP server (not transferring a file from local computer into SFTP).
Here is the code
public void save(String xmlFilePath, Document document) {
TransformerFactory transformerFactory = TransformerFactory.newInstance();
transformerFactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, "");
transformerFactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_STYLESHEET, "");
Transformer transformer;
try {
transformer = transformerFactory.newTransformer();
DOMSource domSource = new DOMSource(document);
StreamResult streamResult = new StreamResult(new File(xmlFilePath));
transformer.transform(domSource,streamResult);
} catch (TransformerException | NullPointerException e) {
e.printStackTrace();
}
}

Use JSch SSH/SFTP library.
Afaik, it's the most widely used SFTP library for Java
It supports uploading data from streams.
I assume that its ChannelSftp.put overload that returns OutputStream can be hooked to your StreamResult (instead of the File).
StreamResult streamResult =
new StreamResult(channelSftp.put("/sftp/path/file.zml"));

checking if Document object is in JSON format in java

I have a function that returns a Document object in java - how would one go about checking whether this Document object is in JSON format or not?

Try with the following code: It will get the document object as String as then parse it to check whether it is a JSON object or a JSON array.
// IMPORTS USED
// import org.json.*;
Document doc = // YOUR DOCUMENT OBJECT;
DOMSource domSource = new DOMSource(doc);
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.transform(domSource, result);
try {
new JSONObject(writer.toString());
// IS JSON OBJECT
} catch(JSONException ex) {
// NOT JSON OBJECT
try {
new JSONArray(writer.toString());
// IS JSON ARRAY
} catch(JSONException ex1) {
// NOT JSON ARRAY
}
}

Storing the contents in a String variable rather than a file

I have a process of XML transform in which I am writing the output transformed XML to a file. But instead of storing it in a file I want to store it in a string variable. I have created a string variable, please advise how can I store the generated XML in a string variable (msgxml instead of writing a file).
String msgxml;
System.setProperty("javax.xml.transform.TransformerFactory",
"org.apache.xalan.processor.TransformerFactoryImpl");
FileInputStream xml = new FileInputStream(xmlInput);
FileInputStream xsl = new FileInputStream(xslInput);
FileOutputStream os = new FileOutputStream(outputXmlFile);
TransformerFactory tFactory = TransformerFactory.newInstance();
// Use the TransformerFactory to process the stylesheet source and produce a Transformer
StreamSource styleSource = new StreamSource(xsl);
Transformer transformer = tFactory.newTransformer(styleSource);
StreamSource xmlSource = new StreamSource(xml);
StreamResult result = new StreamResult(os);
//here we are storing it in a file ,
try {
transformer.transform(xmlSource, result);
} catch (TransformerException e) {
e.printStackTrace();
}

One way is to use an ByteArrayOutputStream instead of a FileOutputStream:
ByteArrayOutputStream baos = new ByteArrayOutputStream();
TransformerFactory tFactory = TransformerFactory.newInstance();
...
StreamSource xmlSource = new StreamSource(xml);
StreamResult result = new StreamResult(baos); // write to the byte array stream
//here we are storing it in a file ,
try {
transformer.transform(xmlSource, result);
}
...
msgxml = baos.toString("UTF-8"); // get contents of stream using UTF-8 encoding
Another solution is to use a java.io.StringWriter:
StringWriter stringWriter = new StringWriter();
StreamResult result = new StreamResult(stringWriter);
...
msgxml = stringWriter.toString();

StringWriter write to folder

Good Afternoon. I want to use the StringWriter to write the new file to a network folder. Can anyone give me some examples using the code below on how to do this? It's my first time working with the StringWriter class.
public static final void newOutput(Document xml) throws Exception {
Transformer tf = TransformerFactory.newInstance().newTransformer();
tf.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
tf.setOutputProperty(OutputKeys.INDENT, "yes");
StringWriter out = new StringWriter();
tf.transform(new DOMSource(xml), new StreamResult(out));
/*
* need to update to write to folder
*/
System.out.println(out.toString());
}
}

public static final void newOutput(Document xml) throws Exception {
Transformer tf = TransformerFactory.newInstance().newTransformer();
tf.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
tf.setOutputProperty(OutputKeys.INDENT, "yes");
DOMSource source = new DOMSource(xml);
// Use StreamResult to write to a file to current directory
StreamResult out = new StreamResult(new File("test.txt"));
// to print to console
// StreamResult out = new StreamResult(System.out);
tf.transform(source, out);
/*
* console output is redirected to SRC folder to check format
* need to update to write to folder
*/
System.out.println(out.toString());
}

XML Document to String?

I've been fiddling with this for over twenty minutes and my Google-foo is failing me.
Let's say I have an XML Document created in Java (org.w3c.dom.Document):
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
Document document = docBuilder.newDocument();
Element rootElement = document.createElement("RootElement");
Element childElement = document.createElement("ChildElement");
childElement.appendChild(document.createTextNode("Child Text"));
rootElement.appendChild(childElement);
document.appendChild(rootElement);
String documentConvertedToString = "?" // <---- How?
How do I convert the document object into a text string?

public static String toString(Document doc) {
try {
StringWriter sw = new StringWriter();
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
transformer.setOutputProperty(OutputKeys.METHOD, "xml");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.transform(new DOMSource(doc), new StreamResult(sw));
return sw.toString();
} catch (Exception ex) {
throw new RuntimeException("Error converting to String", ex);
}
}

You can use this piece of code to accomplish what you want to:
public static String getStringFromDocument(Document doc) throws TransformerException {
DOMSource domSource = new DOMSource(doc);
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.transform(domSource, result);
return writer.toString();
}