小程序支付类型接入京东支付-编程知识

一、情景描述

当前项目想在微信小程序付款时添加上京东支付支付类型，效果如下

普通的付款方式可以直接付款就能完成支付，但京东支付无法在小程序上直接付款，他需要复制生成的链接，然后打开京东app然后在京东平台上付款。
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所以，我们首先需要了解京东支付的支付流程

二、京东支付实现流程

京东支付跟普通支付不同之处就是无法在当前平台完成支付，需要复制口令前往京东app，在京东app里进行支付操作
具体可查看开放文档：
https://mer.jd.com/open/
文档中也提供了大部分接口demo，可以下载参考
简单概括步骤分为3步：

1、下单接口

调用这个接口，成功的话在响应体中有一个我们需要的数据pay_url，支付链接，我尝试了一下，点击可以进入到京东付款页面，但是我们不要直接使用，要把这个字段封装成金口令。
（注意：设置的请求体中有一个字段callbackUrl回调路径，设置这个值在支付完成后京东会调用这个路径的接口，见3、编写回调方法验证支付订单）
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下单方法代码参考如下

//京东下单支付生成金口令public static ReturnValueDomain<String> pay(Tcorderinfo tcorderinfo ) throws Exception {ReturnValueDomain<String> ret = new ReturnValueDomain<String>();logger.debug("========进入京东支付方法，进入pay=========");if (NonUtil.isNon(tcorderinfo)) {return ret.setFail("京东支付订单不可为空！");}// 得到openidString openid = tcorderinfo.getOpenid();int fee = 0;// 得到小程序传过来的价格，注意这里的价格必须为整数，1代表1分，所以传过来的值必须*100；if (NonUtil.isNon(tcorderinfo.getAdvancepay())) {fee = Integer.parseInt(tcorderinfo.getOrderfee());} else {fee = Integer.parseInt(tcorderinfo.getAdvancepay());}double total_amount = MathHelper.div(fee, 100, 2);logger.debug("==========支付费用/元=={}=====", total_amount);// 订单编号String did = tcorderinfo.getOrderid();// 订单标题-商品名称String title = tcorderinfo.getTradename();Map<String, Object> requestParam = new HashMap<>();//代理商号
//        requestParam.put("agentNum", agentNum);//商户号requestParam.put("customerNum", customerNum);//店铺号
//        requestParam.put("shopNum", shopNum);//机具号
//        requestParam.put("machineNum", machineNum);
//        requestParam.put("requestNum", generateId());//订单号requestParam.put("requestNum", tcorderinfo.getOrderid());//订单号requestParam.put("authCode", tcorderinfo.getOpenid());//openidrequestParam.put("bankType", bankType);//支付类型requestParam.put("orderAmount", total_amount+"");//支付金额requestParam.put("callbackUrl", callbackUrl);requestParam.put("source", source);requestParam.put("orderType", orderType);requestParam.put("payModel", payModel);requestParam.put("payType", payType);requestParam.put("subOrderType", subOrderType);requestParam.put("businessType", businessType);requestParam.put("paySource", paySource);requestParam.put("version", "V4.0");requestParam.put("completeUrl", completeUrl);//支付自定义页面Map<String, String> extraMap = new HashMap<>();extraMap.put("userAgent", "UnionPay / 1.0 CEBBANK");requestParam.put("extraInfo", JSON.toJSON(extraMap));String response = OpenapiRequestUtil.postOpenapi(api_order,accessKey,secretKey, requestParam);JSONObject res = JSONObject.parseObject(response);//添加判断if (!(Boolean) res.get("success")){logger.error("京东下单接口失败：{}",response);return ret.setFail((String) res.get("msg"));}//解析String qrCode = JSONObject.parseObject(res.get("bankRequest").toString()).get("PAY_URL").toString();requestParam = new HashMap<>();JSONObject reqData = new JSONObject();JSONObject request = new JSONObject();request.put("url",qrCode+"&sourceID=xxx");request.put("keyChannel",keyChannel);request.put("sourceCode",sourceCode);request.put("deviceInfo","");reqData.put("request",request);Map<String,Object> map = new HashMap<>();String url = prize_url;//金口令地址map.put("reqData",reqData);System.out.println("金口令请求体"+map);String str = HttpUtil.postFormData(url, map);System.out.println("金口令返回1"+str);res = JSONObject.parseObject(str);//添加判断String code = JSONObject.parseObject(res.get("resultData").toString()).get("code").toString();if (code!=null && "000".equals(code)){} else {String msg = JSONObject.parseObject(res.get("resultData").toString()).get("msg").toString();logger.debug("调用金口令接口出现异常：{}",msg);ret.setFail("京东支付生成金口令出现异常");}//解析String data = JSONObject.parseObject(JSONObject.parseObject(res.get("resultData").toString()).get("data").toString()).get("code").toString();logger.debug("获取金口令：{}",data);return ret.setSuccess("生成金口令响应",str);}

httpUtil工具类

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;
import java.util.Set;public class HttpUtil {private static Logger logger = LoggerFactory.getLogger(HttpUtil.class);public static String postFormData(String url, Map<String, Object> map) throws Exception {BufferedReader in = null;URL urls = new URL(url);HttpURLConnection connection = null;OutputStream outputStream = null;String rs = "";try {connection = (HttpURLConnection) urls.openConnection();connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=----footfoodapplicationrequestnetwork");connection.setDoOutput(true);connection.setDoInput(true);connection.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.8");connection.setRequestProperty("Accept", "*/*");connection.setRequestProperty("Range", "bytes=" + "");connection.setConnectTimeout(8000);connection.setReadTimeout(20000);connection.setRequestMethod("POST");StringBuffer buffer = new StringBuffer();outputStream = connection.getOutputStream();Set<Map.Entry<String, Object>> entries = map.entrySet();for (Map.Entry<String, Object> entry : entries) {// 每次都清空buffer，避免写入上次的数据buffer.delete(0, buffer.length());buffer.append("------footfoodapplicationrequestnetwork\r\n");Object value = entry.getValue();if (!(value instanceof File)) {buffer.append("Content-Disposition: form-data; name=\"");buffer.append(entry.getKey());buffer.append("\"\r\n\r\n");buffer.append(entry.getValue());buffer.append("\r\n");outputStream.write(buffer.toString().getBytes());} else {buffer.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"; filename=\"" + ((File) entry.getValue()).getName() + "\"\r\n");buffer.append("Content-Type: " + "zip" + "\r\n\r\n");outputStream.write(buffer.toString().getBytes());File file = (File) entry.getValue();DataInputStream ins = new DataInputStream(new FileInputStream(file));int bytes = 0;byte[] bufferOut = new byte[1024];while ((bytes = ins.read(bufferOut)) != -1) {outputStream.write(bufferOut, 0, bytes);}// 文件流后面添加换行，否则文件后面的一个参数会丢失outputStream.write("\r\n".getBytes());}}if (entries != null && map.size() > 0) {buffer.delete(0, buffer.length());buffer.append("------footfoodapplicationrequestnetwork--\r\n");}outputStream.write(buffer.toString().getBytes());try {connection.connect();if (connection.getResponseCode() == 200) {in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));String line = "";while ((line = in.readLine()) != null) {rs += line;}}} catch (Exception e) {logger.error("发生异常",e);rs = null;}return rs;} finally {try {outputStream.close();if (in != null){in.close();}} catch (Exception e) {logger.error("发生异常",e);}outputStream = null;if (connection != null)connection.disconnect();connection = null;}}
}