How to Format Unstructured XML Strings in Java?

Formatting Unstructured XML Strings in Java

You have an XML string encoded as a Java String without any formatting, and you need to convert it into a String with proper indentation and line feeds.

To achieve this, you can utilize the Java Transformer class along with the OutputKeys and DOMSource classes.

First, create a new instance of the Transformer class:

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

Configure the Transformer to add indentation to the output:

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

Now, initialize a StreamResult object to capture the transformed result as a String:

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

Create a DOMSource object from your XML string:

DOMSource source = new DOMSource(doc);

Finally, use the Transformer to transform the source XML into the desired formatted output:

transformer.transform(source, result);
String xmlString = result.getWriter().toString();

After this transformation, the xmlString variable will contain the formatted XML. Here's an example:

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();
System.out.println(xmlString);

Output:

<?xml version="1.0" encoding="UTF-8"?>
<root>
 <tag>
   <nested>hello</nested>
 </tag>
</root>

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