package com.mzl.flower.utils.wechatpay;
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import java.util.Map;
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import org.springframework.util.DigestUtils;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.transform.OutputKeys;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.dom.DOMSource;
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import javax.xml.transform.stream.StreamResult;
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import java.io.ByteArrayInputStream;
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import java.io.InputStream;
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import java.io.StringWriter;
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import java.util.*;
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/**
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* 微信支付工具类，xml转map,map转xml，生成签名
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*/
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public class WxPayUtil {
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/**
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* XML格式字符串转换为Map
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*
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* @param strXML XML字符串
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* @return XML数据转换后的Map
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* @throws Exception
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*/
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public static Map<String, String> xmlToMap(String strXML) throws Exception {
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try {
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Map<String, String> data = new HashMap<String, String>();
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DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
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DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
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InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8"));
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org.w3c.dom.Document doc = documentBuilder.parse(stream);
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doc.getDocumentElement().normalize();
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NodeList nodeList = doc.getDocumentElement().getChildNodes();
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for (int idx = 0; idx < nodeList.getLength(); ++idx) {
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Node node = nodeList.item(idx);
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if (node.getNodeType() == Node.ELEMENT_NODE) {
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org.w3c.dom.Element element = (org.w3c.dom.Element) node;
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data.put(element.getNodeName(), element.getTextContent());
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}
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}
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try {
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stream.close();
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} catch (Exception ex) {
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// do nothing
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}
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return data;
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} catch (Exception ex) {
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throw ex;
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}
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}
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/**
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* 将Map转换为XML格式的字符串
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*
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* @param data Map类型数据
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* @return XML格式的字符串
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* @throws Exception
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*/
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public static String mapToXml(Map<String, String> data) throws Exception {
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DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
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DocumentBuilder documentBuilder= documentBuilderFactory.newDocumentBuilder();
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org.w3c.dom.Document document = documentBuilder.newDocument();
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org.w3c.dom.Element root = document.createElement("xml");
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document.appendChild(root);
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for (String key: data.keySet()) {
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String value = data.get(key);
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if (value == null) {
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value = "";
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}
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value = value.trim();
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org.w3c.dom.Element filed = document.createElement(key);
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filed.appendChild(document.createTextNode(value));
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root.appendChild(filed);
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}
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TransformerFactory tf = TransformerFactory.newInstance();
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Transformer transformer = tf.newTransformer();
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DOMSource source = new DOMSource(document);
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transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
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transformer.setOutputProperty(OutputKeys.INDENT, "yes");
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StringWriter writer = new StringWriter();
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StreamResult result = new StreamResult(writer);
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transformer.transform(source, result);
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String output = writer.getBuffer().toString(); //.replaceAll("\n|\r", "");
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try {
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writer.close();
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}
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catch (Exception ex) {
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}
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return output;
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}
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/**
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* 生成微信支付sign
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* @return
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*/
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public static String createSign(SortedMap<String, String> params, String key){
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StringBuilder sb = new StringBuilder();
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Set<Map.Entry<String, String>> es = params.entrySet();
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Iterator<Map.Entry<String,String>> it = es.iterator();
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//生成 stringA="appid=wxd930ea5d5a258f4f&body=test&device_info=1000&mch_id=10000100&nonce_str=ibuaiVcKdpRxkhJA";
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while (it.hasNext()){
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Map.Entry<String,String> entry = (Map.Entry<String,String>)it.next();
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String k = (String)entry.getKey();
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String v = (String)entry.getValue();
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if(null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)){
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sb.append(k+"="+v+"&");
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}
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}
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sb.append("key=").append(key);
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String sign = CommonUtils.MD5(sb.toString()).toUpperCase();
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return sign;
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}
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/**
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* 校验签名
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* @param params
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* @param key
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* @return
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*/
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public static boolean isCorrectSign(SortedMap<String, String> params, String key){
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String sign = createSign(params,key);
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String weixinPaySign = params.get("sign").toUpperCase();
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return weixinPaySign.equals(sign);
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}
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public static String generateNonceStr() {
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return UUID.randomUUID().toString().replace("-", "");
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}
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public static String generateSignature(Map<String, String> data, String key) throws Exception {
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// 1. 字典序排序
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List<String> keys = new ArrayList<>(data.keySet());
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Collections.sort(keys);
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// 2. 拼接字符串
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StringBuilder sb = new StringBuilder();
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for (String k : keys) {
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if (data.get(k) != null && !"".equals(data.get(k)) && !"sign".equals(k)) {
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sb.append(k).append("=").append(data.get(k)).append("&");
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}
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}
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sb.append("key=").append(key);
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// 3. MD5加密
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return DigestUtils.md5DigestAsHex(sb.toString().getBytes("UTF-8")).toUpperCase();
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}
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}
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