How to Pretty Print XML in Java Using XSLT?

Pretty Printing XML in Java

Given a Java String containing unformatted XML, the objective is to transform it into a well-structured XML String with proper line breaks and indentation.

Solution:

1. Instantiate a Transformer:

   Transformer transformer = TransformerFactory.newInstance().newTransformer();

2. Set Output Properties:

   transformer.setOutputProperty(OutputKeys.INDENT, "yes");
   transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");

3. Create a StreamResult for Output:

   StreamResult result = new StreamResult(new StringWriter());

4. Create a DOMSource for the Input String:

   DOMSource source = new DOMSource(doc);

5. Transform Source to Result:

   transformer.transform(source, result);

6. Retrieve Formatted XML String:

   String xmlString = result.getWriter().toString();

Code Example:

String unformattedXml = "<tag><nested>hello</nested></tag>";
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 formattedXml = result.getWriter().toString();
System.out.println(formattedXml);

Note: The specific results may vary depending on the Java version used. Modifications might be necessary to cater to specific platforms.

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