How to Format Unformatted XML Strings in Java?

Formatting XML Strings in Java

You have an unformatted XML string in Java and need to transform it into a readable, indented format. To achieve this, a series of steps are required:

Create a new Transformer instance using TransformerFactory.newInstance().newTransformer().

Configure the Transformer by setting the OutputKeys.INDENT property to "yes" and specifying the indentation amount using the {http://xml.apache.org/xslt}indent-amount property.

Parse the unformatted XML string into a Document Object Model (DOM) using an XML parser.

Create a DOMSource object using the parsed DOM.

Use the StreamResult object to capture the formatted XML as a string.

Apply the Transformer transformation to the DOMSource, writing the result to the StreamResult.

Finally, you will obtain the formatted XML as a string by calling result.getWriter().toString().

Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
StreamResult result = new StreamResult(new StringWriter());
DOMSource source = new DOMSource(doc);
transformer.transform(source, result);
String xmlString = result.getWriter().toString();

Note that the doc variable refers to a parsed XML document that is not shown in the provided code snippet.

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