com.alan344happyframework.util.XmlUtils Maven / Gradle / Ivy

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package com.alan344happyframework.util;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import org.jdom2.Document;
import org.jdom2.JDOMException;
import org.jdom2.input.SAXBuilder;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;


/**
 * @author AlanSun
 * @date 2019-07-04
 */
@Slf4j
public class XmlUtils {

    /**
     * XML格式字符串转换为Map
     *
     * @param strXML XML字符串
     * @return XML数据转换后的Map
     * @throws RuntimeException e
     */
    public static Map xmlToMap(String strXML) throws RuntimeException {
        try {

            DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
            documentBuilderFactory.setExpandEntityReferences(false);
            documentBuilderFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
            DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
            InputStream stream = new ByteArrayInputStream(strXML.getBytes(StandardCharsets.UTF_8));
            org.w3c.dom.Document doc = documentBuilder.parse(stream);
            doc.getDocumentElement().normalize();
            NodeList nodeList = doc.getDocumentElement().getChildNodes();

            int length = nodeList.getLength();
            Map data = new HashMap<>(length);
            for (int idx = 0; idx < length; ++idx) {
                Node node = nodeList.item(idx);
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    org.w3c.dom.Element element = (org.w3c.dom.Element) node;
                    data.put(element.getNodeName(), element.getTextContent());
                }
            }
            stream.close();
            return data;
        } catch (Exception ex) {
            log.warn("Invalid XML, can not convert to map. Error message: {}. XML content: {}", ex.getMessage(), strXML);
            throw new RuntimeException("xml to map error");
        }
    }

    /**
     * 将Map转换为XML格式的字符串
     *
     * @param data Map类型数据
     * @return XML格式的字符串
     */
    public static String mapToXml(Map data) throws RuntimeException {
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder;
        String output;
        try {
            documentBuilder = documentBuilderFactory.newDocumentBuilder();

            org.w3c.dom.Document document = documentBuilder.newDocument();
            org.w3c.dom.Element root = document.createElement("xml");
            document.appendChild(root);
            for (String key : data.keySet()) {
                String value = data.get(key);
                if (value == null) {
                    value = "";
                }
                value = value.trim();
                org.w3c.dom.Element filed = document.createElement(key);
                filed.appendChild(document.createTextNode(value));
                root.appendChild(filed);
            }
            TransformerFactory tf = TransformerFactory.newInstance();
            Transformer transformer = tf.newTransformer();
            DOMSource source = new DOMSource(document);
            transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            StringWriter writer = new StringWriter();
            StreamResult result = new StreamResult(writer);
            transformer.transform(source, result);
            output = writer.getBuffer().toString();
            writer.close();
        } catch (Exception e) {
            throw new RuntimeException("xml解析失败");
        }
        return output;
    }

    /**
     * 获取xml编码字符
     *
     * @param strXml xml
     * @return 字符编码
     * @throws IOException   io
     * @throws JDOMException xml error
     */
    public static String getXMLEncoding(String strXml) throws JDOMException, IOException {
        InputStream in = IOUtils.toInputStream(strXml, StandardCharsets.UTF_8.toString());
        SAXBuilder builder = new SAXBuilder();
        Document doc = builder.build(in);
        in.close();
        Object encoding = doc.getProperty("encoding");
        return Objects.isNull(encoding) ? null : encoding.toString();
    }
}