此文檔中包含單層和多層嵌套情況下，xml和map集合進行互轉，具體代碼如下：

import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Map.Entry;import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.DocumentHelper; import org.dom4j.Element; import cn.sdk.util.StringUtil;public class XmlUtil {private static final String PREFIX_XML = "<xml>";private static final String SUFFIX_XML = "</xml>";private static final String PREFIX_CDATA = "<![CDATA[";private static final String SUFFIX_CDATA = "]]>";/*** 轉化成xml, 單層無嵌套* @param map* @param isAddCDATA* @return*/public static String mapToXml(Map<Object, Object> parm, boolean isAddCDATA) {StringBuffer strbuff = new StringBuffer(PREFIX_XML);if (null != parm) {for (Entry<Object, Object> entry : parm.entrySet()) {strbuff.append("<").append(entry.getKey()).append(">");if (isAddCDATA) {strbuff.append(PREFIX_CDATA);if (null != entry.getValue()) {strbuff.append(entry.getValue());}strbuff.append(SUFFIX_CDATA);} else {if (null != entry.getValue()) {strbuff.append(entry.getValue());}}strbuff.append("</").append(entry.getKey()).append(">");}}return strbuff.append(SUFFIX_XML).toString();}/*** @description 將xml字符串轉換成map* @param xml* @return Map*/public static Map<String, String> xml2Map(String xml) {Map<String, String> map = new HashMap<String, String>();Document doc = null;try {doc = DocumentHelper.parseText(xml); // 將字符串轉為XMLElement rootElt = doc.getRootElement(); // 獲取根節點@SuppressWarnings("unchecked")List<Element> list = rootElt.elements();// 獲取根節點下所有節點for (Element element : list) { // 遍歷節點map.put(element.getName(), element.getText()); // 節點的name為map的key，text為map的value}} catch (DocumentException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}return map;}/*** (多層)xml格式字符串轉換為map** @param xml xml字符串* @return 第一個為Root節點，Root節點之后為Root的元素，如果為多層，可以通過key獲取下一層Map*/public static Map<String, Object> multilayerXmlToMap(String xml) {Document doc = null;try {doc = DocumentHelper.parseText(xml);} catch (DocumentException e) {logger.error("xml字符串解析，失敗 --> {}", e);}Map<String, Object> map = new HashMap<>();if (null == doc) {return map;}// 獲取根元素Element rootElement = doc.getRootElement();recursionXmlToMap(rootElement,map);return map;}/*** multilayerXmlToMap核心方法，遞歸調用* * @param element 節點元素* @param outmap 用于存儲xml數據的map*/@SuppressWarnings("unchecked")private static void recursionXmlToMap(Element element, Map<String, Object> outmap) {// 得到根元素下的子元素列表List<Element> list = element.elements();int size = list.size();if (size == 0) {// 如果沒有子元素,則將其存儲進map中outmap.put(element.getName(), element.getTextTrim());} else {// innermap用于存儲子元素的屬性名和屬性值Map<String, Object> innermap = new HashMap<>();// 遍歷子元素list.forEach(childElement -> recursionXmlToMap(childElement, innermap));outmap.put(element.getName(), innermap);}}/*** (多層)map轉換為xml格式字符串** @param map 需要轉換為xml的map* @param isCDATA 是否加入CDATA標識符 true:加入 false:不加入* @return xml字符串*/public static String multilayerMapToXml(Map<String, Object> map, boolean isCDATA){String parentName = "xml";Document doc = DocumentHelper.createDocument();doc.addElement(parentName);String xml = recursionMapToXml(doc.getRootElement(), parentName, map, isCDATA);return formatXML(xml);}/*** multilayerMapToXml核心方法，遞歸調用** @param element 節點元素* @param parentName 根元素屬性名* @param map 需要轉換為xml的map* @param isCDATA 是否加入CDATA標識符 true:加入 false:不加入* @return xml字符串*/@SuppressWarnings("unchecked")private static String recursionMapToXml(Element element, String parentName, Map<String, Object> map, boolean isCDATA) {Element xmlElement = element.addElement(parentName);map.keySet().forEach(key -> {Object obj = map.get(key);if (obj instanceof Map) {recursionMapToXml(xmlElement, key, (Map<String, Object>)obj, isCDATA);} else {String value = obj == null ? "" : obj.toString();if (isCDATA) {xmlElement.addElement(key).addCDATA(value);} else {xmlElement.addElement(key).addText(value);}}});return xmlElement.asXML();}/*** 格式化xml,顯示為容易看的XML格式** @param xml 需要格式化的xml字符串* @return*/public static String formatXML(String xml) {String requestXML = null;try {// 拿取解析器SAXReader reader = new SAXReader();Document document = reader.read(new StringReader(xml));if (null != document) {StringWriter stringWriter = new StringWriter();// 格式化,每一級前的空格OutputFormat format = new OutputFormat(" ", true);// xml聲明與內容是否添加空行format.setNewLineAfterDeclaration(false);// 是否設置xml聲明頭部format.setSuppressDeclaration(false);// 是否分行format.setNewlines(true);XMLWriter writer = new XMLWriter(stringWriter, format);writer.write(document);writer.flush();writer.close();requestXML = stringWriter.getBuffer().toString();}return requestXML;} catch (Exception e) {logger.error("格式化xml，失敗 --> {}", e);return null;}}

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