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这两种方式只能从Map<String,String>格式转为xml格式

第一种：

public static String mapToXml(Map<String, String> data) throws Exception {
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder= documentBuilderFactory.newDocumentBuilder();
        org.w3c.dom.Document document = documentBuilder.newDocument();
        org.w3c.dom.Element root = document.createElement("request"); //根节点
        document.appendChild(root);
        for (String key: data.keySet()) {
            String value = data.get(key).toString();
            if (value == null) {
                value = "";
            }
            value = value.trim();
            org.w3c.dom.Element filed = document.createElement(key);
            filed.appendChild(document.createTextNode(value));
            root.appendChild(filed);
        }
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer = tf.newTransformer();
        DOMSource source = new DOMSource(document);
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        StringWriter writer = new StringWriter();
        StreamResult result = new StreamResult(writer);
        transformer.transform(source, result);
        String output = writer.getBuffer().toString(); //.replaceAll("\n|\r", "");
        try {
            writer.close();
        }
        catch (Exception e) {
            e.getMessage();
        }
        return output;
    }

第二种：

public static String mapToXml(Map<String, String> map) throws IOException {
                 Document d = DocumentHelper.createDocument();
                 Element root = d.addElement("request"); //根节点
                 Set<String> keys = map.keySet();
                for(String key:keys) {
                         root.addElement(key).addText(String.valueOf(map.get(key)));
                     }
                 StringWriter sw = new StringWriter();
                 XMLWriter xw = new XMLWriter(sw);
                 xw.setEscapeText(false);
                 xw.write(d);
                 return sw.toString();
             }