Java中操作Xml使用方法备忘录(Hutool工具类XmlUtil、XStream)

/*** xml解析顺序是否有序* @author ASen*/

public enum XmlSort{/*** 有序*/ SORT(LinkedHashMap.class,"有序"),/*** 无序*/ NO_SORT(HashMap.class,"无序");

/*** 创建的map字节码对象*/ private final Class mapClass;

/*** 顺序名称*/ private final String message ;

XmlSort(Class mapClass, String message) {this.mapClass = mapClass;this.message = message;}

public Class getMapClass() {return mapClass;}

import cn.hutool.core.lang.Assert;import cn.hutool.core.util.ObjectUtil;import cn.hutool.json.JSONUtil;import com.asen.demo.constant.XmlSort;import org.dom4j.Attribute;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;import org.dom4j.tree.DefaultDocument;import org.dom4j.tree.DefaultElement;

import java.io.File;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import java.util.Map;

/*** xml解析帮组类* @author asen* @date 2022/1/10 15:17*/ public class XmlUtil {

/*** 标签属性*/ private final static String TAG_ATTR = "attr";

/*** 创建的map类型*/ private XmlSort xmlSort = XmlSort.NO_SORT;

/*** map to xml* @param map map对象* @return xml 字符串*/ public String mapToXml(Map map) {if(map.size() != 1){throw new RuntimeException("map根节点长度不为1");}String key = "";for (String str : map.keySet()) {key = str ;}// 创建根节点Element rootElement = new DefaultElement(key);Document document = new DefaultDocument(rootElement);Element node = document.getRootElement();Object obj = map.get(key);// 断言Assert.isAssignable(Map.class,obj.getClass());mapNodes(node,(Map)obj);return document.asXML();}

/*** 父类节点已经创建， map 包含父类* @param node node* @param map map*/ public void mapNodes(Element node, Map map) {map.forEach((k,v)->{Object obj = map.get(k);// 给当前父类添加属性if(TAG_ATTR.equals(k)){Assert.isAssignable(Map.class,obj.getClass());Map tagMap = (Map) obj;tagMap.forEach((tagKey,tagValue)->{node.addAttribute(tagKey, (String) tagValue);});return ;}if(obj instanceof Map){Element newElement = node.addElement(k);// map 处理Map childMap = (Map) obj;mapNodes(newElement,childMap);}else if (obj instanceof String){Element newElement = node.addElement(k);newElement.setText((String) v);} else if (obj instanceof List) {List> list = (List>) obj;list.forEach(itemMap->{Element newElement = node.addElement(k);mapNodes(newElement,itemMap);});}});}

/*** 读取xml文件，返回json字符串** @param fileName 文件路径* @return json字符串* @throws DocumentException 异常*/ public String xmlToJson(String fileName) throws DocumentException {Map xmlMap = xmlToMap(fileName);return JSONUtil.toJsonStr(xmlMap);}

/*** 读取xml文件，返回map对象** @param fileName 文件路径* @return map对象* @throws DocumentException 异常*/ public Map xmlToMap(String fileName) throws DocumentException {// 创建saxReader对象SAXReader reader = new SAXReader();// 通过read方法读取一个文件 转换成Document对象Document document = reader.read(new File(fileName));//获取根节点元素对象Element node = document.getRootElement();//遍历所有的元素节点Map map = getNewMap();// 处理节点listNodes(node, map);return map;}

/*** 遍历当前节点元素下面的所有(元素的)子节点** @param node node*/ public void listNodes(Element node, Map map) {Map xiaoMap = getNewMap();String nodeKey = node.getName();// 获取当前节点的所有属性节点List list = node.attributes();// 遍历属性节点Map attrMap = getNewMap();for (Attribute attr : list) {attrMap.put(attr.getName(), attr.getValue());}if (ObjectUtil.isNotEmpty(attrMap)) {xiaoMap.put(TAG_ATTR, attrMap);}

// 当前节点下面子节点迭代器Iterator it = node.elementIterator();

if (!("".equals(node.getTextTrim())) || !it.hasNext()) {map.put(nodeKey, node.getTextTrim());}else{// 不为空if (ObjectUtil.isEmpty(map.get(nodeKey))) {map.put(nodeKey, xiaoMap);} else {List> childList = null;// 获取原来的Object obj = map.get(nodeKey);if (obj instanceof Iterable) {// 非第一个childList = (List>) obj;childList.add(xiaoMap);} else if (obj instanceof Map) {// 第一个Map childMap = (Map) obj;childList = new ArrayList<>();childList.add(childMap);childList.add(xiaoMap);}// 添加新的map.put(nodeKey, childList);}}

// 遍历while (it.hasNext()) {// 获取某个子节点对象Element e = it.next();// 对子节点进行遍历listNodes(e, xiaoMap);}}

/*** 获取一个新的map对象** @return map对象*/ private Map getNewMap() {Object obj = null;try {obj = xmlSort.getMapClass().newInstance();if (obj instanceof Map) {return (Map) obj;}} catch (InstantiationException | IllegalAccessException e) {e.printStackTrace();}return null;}

/*** XStream 实现bean与xml之间相互转换*/ public class XStreamXmlBeanUtil {/*** JavaBean转XML* @param bean - JavaBean* @return - XML*/ public static String toXml(Object bean) {return initXStream(bean.getClass()).toXML(bean);}

/*** XML转JavaBean* @param xml - XML* @param beanClazz - JavaBean Class* @param * @return - JavaBean*/@SuppressWarnings("unchecked") public static T fromXml(String xml, Class beanClazz) {return (T) initXStream(beanClazz).fromXML(xml);}

private static XStream initXStream(Class beanClazz) {XStream x = new XStream();x.registerConverter(new DateConverter("yyyy-MM-dd HH:mm:ss", null,TimeZone.getTimeZone("GMT+8")));

public class Test {public static void main(String[] args) {// 1. 普通bean与Xml互转User user = new User("貂蝉", 18, "女");System.out.println("============普通bean转Xml===============");String xml = XStreamXmlBeanUtil.toXml(user);System.out.println(xml);System.out.println("============Xml转普通bean===============");System.out.println(XStreamXmlBeanUtil.fromXml(xml, User.class));

// 2. 继承bean与Xml互转Child child = new Child("吃糖葫芦");child.setName("葫芦娃");child.setAge(2);child.setGender("男");child.setHobby("打游戏");

System.out.println("============继承bean转Xml===============");xml = XStreamXmlBeanUtil.toXml(child);System.out.println(xml);System.out.println("============Xml转继承bean====");// 生成的Xml仅有Child的属性hobby，但转后后的Child对象，父属性都是有值的；

System.out.println(XStreamXmlBeanUtil.fromXml(xml, Child.class));System.out.println("============Xml转继承bean，测试转换后，父属性、自身属性是否有值====");Child c2 = XStreamXmlBeanUtil.fromXml(xml, Child.class);System.out.println( "11111==" + c2.getName() + c2.getGender() + c2.getHobby());

// 输出内容如下：// ============普通bean转Xml===============// // 貂蝉// 18// 女// // ============Xml转普通bean===============// XmlTest.User(name=貂蝉, age=18, gender=女)// ============继承bean转Xml===============// // 葫芦娃// 2// 男// 打游戏// // ============Xml转继承bean====// XmlTest.Child(hobby=打游戏)// 11111==葫芦娃男打游戏}}

@Data@NoArgsConstructor@AllArgsConstructor@XStreamAlias("Women") class User {private String name;private int age;private String gender;}