1.输出xml文件
Document document = DocumentHelper.createDocument();
//根节点
Element root = document.addElement("rootName");
//子节点
Element element = root.addElement("nodeName");
//子节点属性
element.addAttribute("attributeName","attributeValue");
//设置输出格式
OutputFormat format = OutputFormat.createPrettyPrint();
//写入xml文件
XMLWriter writer = new XMLWriter(new FileWriter(file),format);
writer.write(document);
writer.close();