java解析xml文件，返回xml字符串

public static String toStringFromDoc(Document document) {
		String result = null;

		if (document != null) {
			StringWriter strWtr = new StringWriter();
			StreamResult strResult = new StreamResult(strWtr);
			TransformerFactory tfac = TransformerFactory.newInstance();
			try {
				javax.xml.transform.Transformer t = tfac.newTransformer();
				t.setOutputProperty(OutputKeys.ENCODING, "UTF-16");
				t.setOutputProperty(OutputKeys.INDENT, "yes");
				t.setOutputProperty(OutputKeys.METHOD, "xml"); // xml, html,
				// text
				t.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
				t.transform(new DOMSource(document.getDocumentElement()), strResult);
			} catch (Exception e) {
				System.err.println("XML.toString(Document): " + e);
			}
			result = strResult.getWriter().toString();
			try {
				strWtr.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return result;
	}

public static void main(String[] args) {
		URL url = ImitateService.class.getClassLoader().getResource("/In.xml");
		String file = url.getFile();
		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
		try {
			DocumentBuilder db = dbf.newDocumentBuilder();
			Document doc = db.parse(file);
			String xml = toStringFromDoc(doc);
			LogUtil.info(xml);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

没有依赖什么第三方的jar，都是jdk自带，引入包就行了。