利用 JDK 自带的 org.w3c.dom 进行对象, map 与 xml 的互相转换

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利用 JDK 自带的 org.w3c.dom 进行对象,map 与 xml 的简单互相转换, 其中用到了一个工具类 Hutools 下面是hutools的maven依赖

	cn.hutool
	hutool-all
	4.1.19

下面是工具类

/**
 * xml 工具,基于 jdk 内置的 xml api
 * @author zcqshine
 * @date 2018/12/8
 */
@Slf4j
public class W3CXmlUtil {
    /**
     * Number 子类的类型名称集合
     */
    private static final Set NUMBER_CHILDREN_CLASS_NAME = new HashSet<>();

    static {
        NUMBER_CHILDREN_CLASS_NAME.add(Integer.class.getName());
        NUMBER_CHILDREN_CLASS_NAME.add(Float.class.getName());
        NUMBER_CHILDREN_CLASS_NAME.add(Short.class.getName());
        NUMBER_CHILDREN_CLASS_NAME.add(Double.class.getName());
        NUMBER_CHILDREN_CLASS_NAME.add(Long.class.getName());
        NUMBER_CHILDREN_CLASS_NAME.add(BigDecimal.class.getName());
        NUMBER_CHILDREN_CLASS_NAME.add(BigInteger.class.getName());
        NUMBER_CHILDREN_CLASS_NAME.add(int.class.getName());
        NUMBER_CHILDREN_CLASS_NAME.add(short.class.getName());
        NUMBER_CHILDREN_CLASS_NAME.add(float.class.getName());
        NUMBER_CHILDREN_CLASS_NAME.add(double.class.getName());
        NUMBER_CHILDREN_CLASS_NAME.add(long.class.getName());
    }

    /**
     * xml 字符串转换为 Object
     * @param xmlStr
     * @param clazz
     * @param 
     * @return
     * @throws Exception
     */
    public static  T readObjectFormXml(String xmlStr, Class clazz) throws Exception {
        T t;
        if (xmlStr == null || xmlStr.trim().length() == 0){
            throw new IllegalArgumentException("XML content string is empty !");
        } else {
            try {
                t = clazz.newInstance();
                Document document = XmlUtil.parseXml(xmlStr);
                if (document != null){
                    Element element = document.getDocumentElement();
                    if (element != null){
                        NodeList nodeList = element.getChildNodes();
                        for (int i = 0; i xml2Map(String xmlStr){
        Map map = new TreeMap<>();
        if (StrUtil.isBlank(xmlStr)){
            throw new IllegalArgumentException("xml is empty");
        }else{
            Document document = XmlUtil.parseXml(xmlStr);
            Element element = document.getDocumentElement();
            if (element != null){
                NodeList nodeList = element.getChildNodes();
                for (int i = 0; i < nodeList.getLength(); i++){
                    Node node = nodeList.item(i);
                    String nodeName = node.getNodeName();
                    String nodeText = node.getTextContent();
                    map.put(nodeName, nodeText);
                }
            }
        }
        return map;
    }

    /**
     * Object 转 xml 字符串
     * @param t
     * @param 
     * @return
     */
    public static  String object2Xml(T t){
        try {
			//得到 DOM 解析器的工厂实例
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            //从 DOM 工厂中获得 DOM 解析器
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.newDocument();
            Element root = document.createElement("xml");
            document.appendChild(root);
            Class clazz = t.getClass();
            Field[] fields = clazz.getDeclaredFields();
            if (fields.length > 0){
                for (Field field : fields) {
                    field.setAccessible(true);
                    String fieldName = field.getName();
                    Element element = document.createElement(fieldName);
                    Object obj = field.get(t);
                    if (obj != null){
                        String value = String.valueOf(obj);
                        element.appendChild(document.createCDATASection(value));
                    }
                    root.appendChild(element);
                }
            }
            return XmlUtil.toStr(document);
        } catch (ParserConfigurationException | IllegalAccessException  e) {
            log.error("对象转 XML 失败. ", e);
        }
        return null;
    }

    /**
     * map 转 xml
     * @param map
     * @return
     */
    public static  String map2Xml(Map map){
        if (map != null && !map.isEmpty()){
            try {
                DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
                //从 DOM 工厂中获得 DOM 解析器
                DocumentBuilder builder = factory.newDocumentBuilder();
                Document document = builder.newDocument();
                Element root = document.createElement("xml");
                document.appendChild(root);
                map.entrySet().forEach(item -> {
                    String key = item.getKey();
                    T object = item.getValue();
                    String value = null;
                    if (object != null){
                        value = String.valueOf(object);
                    }
                    Element element = document.createElement(key);
                    element.appendChild(document.createCDATASection(value));
                    root.appendChild(element);
                });
                return XmlUtil.toStr(document);
            } catch (ParserConfigurationException e) {
                log.error("map转 xml 失败.", e);
            }
        }
        return null;
    }
}

转载于:https://my.oschina.net/zcqshine/blog/2986663