QQ小程序支付 Java后端

同学折腾QQ小程序的支付折腾了好几天，没有完成统一下单，因为我做过微信和支付宝支付，他就让我帮忙搞
我搞了好两三个小时，也没搞出来，最终我觉得问题在商户key那里，问了几次甲方，他说key没问题
我仍然觉得问题很有可能在key，就去直接给他重置了key，然后，就成功完成了支付…
总结，永远不要相信甲方

QQ小程序支付与微信小程序支付类似，签名方式完全相同，提交的xml有些不同

QQ小程序统一下单文档
微信小程序验签工具(QQ小程序适用)

首先是配置类，设置为包内访问权限，其实应该放于properties文件，或者直接配置在xml中，偷了个懒直接写在了代码中

public class PayConfigs {final static String appid="";final static String mchid="";final static String key="";final static String reqAd="https://qpay.qq.com/cgi-bin/pay/qpay_unified_order.cgi";
}

qq支付中心，小程序支付需要首先发起一个request到后端并携带一些商品信息，后端提交XML然后返回一个prepay_id到前端，小程序提供唤醒支付API调用

qq.request({url: "请求地址",data: { /* 数据 */ },success: function(result) {if (result.data) {qq.requestPayment({package: "prepay_id=" + result.data.prepay_id,bargainor_id: "", //商户号success(res) { },fail(res) { }})}}})

发起支付的Java方法，需要用到一个工具类，在文末写明

public Map<String,String> qqPay() throws Exception{String mchid = PayConfigs.mchid;String nonce_str = PayUtil.getRandomStringByLength(16);String body = "测试";String out_trade_no = "OTS"+ PayUtil.getRandomStringByLength(12); //商户订单号String fee_type = "CNY";String total_fee = "100"; //自定义货币总额，单位为分String spbill_create_ip = ""; // 用户客户端ipString trade_type = "JSAPI"; //小程序默认为JSAPIString notify_url = "http://www.baidu.com"; //回调地址Map<String, String> packageParams = new HashMap<>();packageParams.put("mch_id", mchid);packageParams.put("nonce_str", nonce_str);packageParams.put("body", body);packageParams.put("out_trade_no", out_trade_no + ""); //商户订单号packageParams.put("total_fee", total_fee + ""); //支付金额，需要转成字符串packageParams.put("spbill_create_ip", spbill_create_ip);packageParams.put("notify_url", notify_url); //支付成功后的回调地址packageParams.put("trade_type", trade_type); //支付方式String result = PayUtil.exec(packageParams,PayConfigs.key,PayConfigs.reqAd);System.out.println(result);// 业务逻辑return PayUtil.xmlToMap(result);}

当用户支付成功后腾讯服务器会访问提交的notify_url即回调地址，并携带XML提供订单号与签名验证等

public String acceptPay(HttpServletRequest request) throws Exception{BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream()));String line;StringBuilder stringBuilder = new StringBuilder();while ((line = br.readLine()) != null) {stringBuilder.append(line);}br.close();String notityXml = stringBuilder.toString();Map<String,String> acceptParam = PayUtil.xmlToMap(notityXml);if (acceptParam.get("trade_state").equals("SUCCESS") && PayUtil.verifySign(acceptParam,PayConfigs.key)){// 注意，在QQ服务器收到Accept之前可能会产生多次回调。需要有处理多次回调的代码// 业务逻辑System.out.println(PayUtil.acceptXML());}return PayUtil.acceptXML();}

依赖以及工具类 文章提及的所有代码

<dependencies><dependency><groupId>commons-codec</groupId><artifactId>commons-codec</artifactId><version>1.6</version></dependency>
</dependencies>

package com.utils;import org.apache.commons.codec.digest.DigestUtils;import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.*;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;public class PayUtil {public static String exec(Map<String, String> map, String key, String gateway) {Map<String, String> sortedMap = sortMapByKey(map);String sign = getLinkToSign(sortedMap, key);String xml = mapToXml(sortedMap, sign);String result = PayUtil.httpRequest(gateway, "POST", xml);return result;}public static String getRandomStringByLength(int length) {String base = "abcdefghijklmnopqrstuvwxyz0123456789";Random random = new Random();StringBuilder stringBuilder = new StringBuilder();for (int i = 0; i < length; i++) {int number = random.nextInt(base.length());stringBuilder.append(base.charAt(number));}return stringBuilder.toString();}public static Map<String, String> xmlToMap(String strXML) throws Exception {Map<String, String> data = new HashMap<>();DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();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();for (int idx = 0; idx < nodeList.getLength(); ++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());}}return data;}public static boolean verifySign(Map<String, String> map, String key){String sign = map.get("sign");map.remove("sign");Map<String, String> sortedMap = sortMapByKey(map);String xmlSign = getLinkToSign(sortedMap, key);return xmlSign.equals(sign);}public static String acceptXML(){return "<xml><return_code>SUCCESS</return_code></xml>";}private static String sign(String text, String key) {text = text + "key=" + key;
//        System.out.println("Sign Url: " + text);return DigestUtils.md5Hex(getContentBytes(text)).toUpperCase();}private static byte[] getContentBytes(String content) {return content.getBytes(StandardCharsets.UTF_8);}private static String getLinkToSign(Map<String, String> map, String payKey) {StringBuilder preStr = new StringBuilder();for (Map.Entry<String, String> m : map.entrySet()) {String key = m.getKey();String value = m.getValue();preStr.append(key).append("=").append(value).append("&");}String link = preStr.toString();return sign(link, payKey);}private static String httpRequest(String requestUrl, String requestMethod, String outputStr) {StringBuilder stringBuilder = new StringBuilder();try {URL url = new URL(requestUrl);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod(requestMethod);conn.setDoOutput(true);conn.setDoInput(true);conn.connect();if (null != outputStr) {OutputStream os = conn.getOutputStream();os.write(outputStr.getBytes(StandardCharsets.UTF_8));os.close();}InputStream is = conn.getInputStream();InputStreamReader isr = new InputStreamReader(is, StandardCharsets.UTF_8);BufferedReader br = new BufferedReader(isr);String line;while ((line = br.readLine()) != null) {stringBuilder.append(line);}br.close();} catch (Exception e) {e.printStackTrace();}return stringBuilder.toString();}private static Map<String, String> sortMapByKey(Map<String, String> map) {List<String> keys = new ArrayList<>(map.keySet());Collections.sort(keys);// HashMap底层是数组加链表，会把key的值放在通过哈希算法散列后的对象的数组坐标上，// 所以取得的值是按哈希表来取的，所以和放入的顺序无关// 保持有序需要用LinkedHashMapMap<String, String> m = new LinkedHashMap<>();for (String key : keys) {m.put(key, map.get(key));}map.clear();return m;}private static String mapToXml(Map<String, String> map, String sign) {StringBuilder stringBuilder = new StringBuilder().append("<xml>");for (Map.Entry<String, String> m : map.entrySet()) {stringBuilder.append("<").append(m.getKey()).append(">").append(m.getValue()).append("</").append(m.getKey()).append(">");}stringBuilder.append("<sign>").append(sign).append("</sign>").append("</xml>");return stringBuilder.toString();}}