Format XML in Java

Thing you want to do


A string like


I want to convert it like this.


There seem to be various theories about how to do it, but I combined some of them as follows.

	static public String formatXml(String xml) {

		try {

			InputStream bais = new ByteArrayInputStream(xml.getBytes("utf-8"));

			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
			DocumentBuilder builder = factory.newDocumentBuilder();
			Document doc = builder.parse(bais);

			Transformer transformer = TransformerFactory.newInstance().newTransformer();
			transformer.setOutputProperty(OutputKeys.INDENT, "yes");
			transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
			transformer.setOutputProperty("{}indent-amount", "2");
			StreamResult result = new StreamResult(new StringWriter());
			DOMSource source = new DOMSource(doc);
			transformer.transform(source, result);
			String xmlString = result.getWriter().toString();
			String header = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
			return header + "\n" + xmlString;

		} catch (Exception e) {
		return xml;

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