读取XML文件转为String类型

File fileinput = new File("src/main/resources/.xml");
        DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
        Document doc = dBuilder.parse(fileinput);


        // 方法1：将xml文件转化为String
//        StringWriter sw = new StringWriter();
//        TransformerFactory tf = TransformerFactory.newInstance();
//        Transformer transformer = tf.newTransformer();
//        transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
//        transformer.setOutputProperty(OutputKeys.METHOD, "xml");
//        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
//        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
//        transformer.transform(new DOMSource(doc), new StreamResult(sw));
//        System.out.println(sw);
        

        //方法2
        DOMSource domSource = new DOMSource(doc);
        StringWriter writer = new StringWriter();
        StreamResult result = new StreamResult(writer);
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer = tf.newTransformer();
        transformer.transform(domSource, result);
        // 将转换过的xml的String 样式打印到控制台
//        System.out.println(writer);