XML封装消息

Document document = DocumentHelper.createDocument();
document.setXMLEncoding(ChARSET_UTF_8);

Element root = document.addElement("message");
Element head = root.addElement("head");

head.addElement("field").addAttribute("name"," ").setText("");

Element body = root.addElement("body");
body.addElement("field").addAttribute("name","").setText("");

return document.asXML();