针对APP的后台支付代码（微信和支付宝） _后台

非淡泊无以明志，非宁静无以致远。这篇文章主要讲述针对APP的后台支付代码（微信和支付宝）相关的知识，希望能为你提供帮助。
APP支付： 1.微信支付：这是app支付时，一个完整的流程

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1.1首先要去微信开放平台注册，并创建APP

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1.2取得微信支付的权限

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1.3 商户平台有公众号平台和APP平台两种，一定要是APP平台，可以在下面这个地方查看

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1.4 我们需要在商户平台和开放平台上获取到以下数据：开放平台： APPID、APP_SECRET：见1图。商户平台：秘钥（APP_KEY）：微信商户平台(pay.weixin.qq.com)--> 账户设置--> API安全--> 密钥设置商户号（MCH_ID）：微信商户平台(pay.weixin.qq.com)--> 账户设置--> 商户信息--> 微信支付商户号数字证书（微信退款需要使用）：微信商户平台(pay.weixin.qq.com)--> 账户设置--> API安全--> 证书下载 2.支付宝的操作流程简单，文档清楚（略） 3准备工作结束，我的产品是使用Hbuilder开发的html5的APP，后端是依托于java Web程序。工作流程参照时序图。主要代码如下，详情见文件其中用到一些工具方法或者客户端创建代码都在链接里面有，我放在了码云上面 https://gitee.com/muziTM/payDemo 3.1 入口

/** * 支付类包含支付宝和微信 * @author Tianming_Li * */ @Controller @RequestMapping("/payController") public class PayController { //订单 @Autowired OrdersService orderService; //付费 @Autowired PayService payService; //退费 @Autowired RefundService refundService; //支付成功回调 @Autowired CallBackService callBackService; /** * 下单 * @param outTradeNo * @param payType * @param request * @param response * @param modelMap * @return */ @RequestMapping("/pay") public String pay(@RequestParam(name="outTradeNo") String outTradeNo,@RequestParam(name="payType") String payType, HttpServletRequest request,HttpServletResponse response, ModelMap modelMap){ //根据订单号获取到订单信息 Orders order = orderService.selectOrdersInfoByOutTradeNo(outTradeNo); if("wxpay".equals(payType)){ return payService.wxPay(order, request, response, modelMap); }else{ return payService.aliPay(order); } } /** * 退款 * @param outTradeNo * @param payType * @param request * @param response * @return */ @RequestMapping("/refunds") public String refunds(@RequestParam(name="outTradeNo") String outTradeNo,@RequestParam(name="payType") String payType, HttpServletRequest request,HttpServletResponse response){ //根据订单号获取到订单信息 Orders order = orderService.selectOrdersInfoByOutTradeNo(outTradeNo); if("wxpay".equals(payType)){ return refundService.wxRefund(order, request, response); }else{ return refundService.aliRefund(order); } }/** * 接收微信支付成功通知 * * @param request * @param response * @throws IOException */@RequestMapping(value = "https://www.songbingjia.com/getWxPayNotify") public void getWxPayNotify(HttpServletRequest request, HttpServletResponse response) throws IOException { callBackService.wxCallBack(request, response); } /** * 接收支付宝支付成功回调 * @param request * @param response * @throws IOException */ @RequestMapping("/getAliPayNotify") public void getAliPayNotify(HttpServletRequest request, HttpServletResponse response) throws IOException { callBackService.aliCallBack(request, response); }}

3.2 支付代码

/** * 支付处理 * @author Tianming_Li * */ @Service("payService") public class PayServiceImpl implements PayService {protected static final Log logger = LogFactory.getLog(PayServiceImpl.class); @Override public String wxPay(Orders order, HttpServletRequest request, HttpServletResponse response, ModelMap modelMap) { BaseDao dao = DaoUtils.getDao("sys"); StringBuilder sb = new StringBuilder(); sb.append("SELECT * FROM WX_PAY_CONFIG WHERE YY_ID = ‘"); sb.append(order.getYyId()); sb.append("‘"); //获取到微信配置参数 WxPayConfig appPayConfig = dao.getObjectBySql(sb.toString(), WxPayConfig.class); Map< String, Object> map = new HashMap< String, Object> (); //初始化一个请求对象 WxRequestHandler wxRequestHandler = new WxRequestHandler(request, response); String payFee = order.getPayMoney(); int intPayFee = (int) (Float.valueOf(payFee) * 100); String nonceStr = WxUtils.getNonceStr(); String outTradeNo = order.getOutTradeNo(); String timestamp = WxUtils.getTimeStamp(); wxRequestHandler.setParameter("appid", appPayConfig.getAppId()); //appId wxRequestHandler.setParameter("mch_id", appPayConfig.getMchId()); //商户号 wxRequestHandler.setParameter("nonce_str", nonceStr); //随机字符串 wxRequestHandler.setParameter("body", appPayConfig.getBody()); //商品描述 wxRequestHandler.setParameter("notify_url", appPayConfig.getNotifyUrl()); //通知地址 wxRequestHandler.setParameter("out_trade_no", outTradeNo); wxRequestHandler.setParameter("spbill_create_ip", request.getRemoteAddr()); wxRequestHandler.setParameter("total_fee", String.valueOf(intPayFee)); wxRequestHandler.setParameter("trade_type", "APP"); //注意签名生成方式，具体见官方文档 wxRequestHandler.setParameter("sign", wxRequestHandler.createMD5Sign(appPayConfig.getAppKey())); String prepayid; try { prepayid = wxRequestHandler.sendPrepay(); if (prepayid != null & & !prepayid.equals("")) { String signs ="appid=" + appPayConfig.getAppId() + "& noncestr=" + nonceStr + "& package=Sign=WXPay" + "& partnerid="+ appPayConfig.getPartnerId() //商户id + "& prepayid=" + prepayid + "& timestamp=" + timestamp + "& key=" + appPayConfig.getAppKey(); //商户平台---api安全---密钥 map.put("code", 200); map.put("info", "success"); map.put("prepayid", prepayid); map.put("sign", WxUtils.getMD5Encode(signs, "utf8").toUpperCase()); map.put("appid", appPayConfig.getAppId()); map.put("timestamp", timestamp); // 等于请求prepayId时的time_start map.put("noncestr", nonceStr); // 与请求prepayId时值一致 map.put("package", "Sign=WXPay"); // 固定常量 map.put("partnerid", appPayConfig.getPartnerId()); //商户id } else { map.put("code", 400); map.put("info", "获取prepayid失败"); } } catch (Exception e) { map.put("code", 405); map.put("info", "系统异常"); }return JSONUtils.toJSON(map); }@Override public String aliPay(Orders order) { //获取配置参数 BaseDao dao = DaoUtils.getDao("sys"); StringBuilder sb = new StringBuilder(); sb.append("SELECT * FROM ALI_PAY_CONFIG WHERE YY_ID = ‘"); sb.append(order.getYyId()); sb.append("‘"); AliPayConfig appPayConfig = dao.getObjectBySql(sb.toString(), AliPayConfig.class); // 实例化客户端（参数：网关地址、商户appid、商户私钥、格式、编码、支付宝公钥、加密类型），为了取得预付订单信息 AlipayClient alipayClient = new DefaultAlipayClient(appPayConfig.getUrl(), appPayConfig.getAppId(), appPayConfig.getRsaPrivateKey(), appPayConfig.getFormat(), appPayConfig.getCharset(), appPayConfig.getPublicKey(), appPayConfig.getSigntype()); // 实例化具体API对应的request类,类名称和接口名称对应,当前调用接口名称：alipay.trade.app.pay AlipayTradeAppPayRequest request = new AlipayTradeAppPayRequest(); // SDK已经封装掉了公共参数，这里只需要传入业务参数。以下方法为sdk的model入参方式(model和biz_content同时存在的情况下取biz_content)。 AlipayTradeAppPayModel model = new AlipayTradeAppPayModel(); //销售产品码，商家和支付宝签约的产品码，为固定值QUICK_MSECURITY_PAY BeanUtils.copy(order, model); //将订单信息复制到model类中 request.setBizModel(model); // 回调地址指向回调函数example: https://ip:port/payController/getAliPayNotify.do request.setNotifyUrl(appPayConfig.getNotifyUrl()); String orderStr = ""; try { // 这里和普通的接口调用不同，使用的是sdkExecute AlipayTradeAppPayResponse response = alipayClient.sdkExecute(request); orderStr = response.getBody(); logger.info("订单str：" + orderStr); } catch (AlipayApiException e) { logger.info(e.getMessage()); } return orderStr; }}

3.2回调代码

@Service("callBackService") public class CallBackServiceImpl implements CallBackService {private static final Log LOGGER = LogFactory.getLog(CallBackServiceImpl.class); public static final String SUCCESS = "SUCCESS"; @SuppressWarnings("unchecked") @Override public void wxCallBack(HttpServletRequest request, HttpServletResponse response) throws IOException { PrintWriter writer = response.getWriter(); InputStream inputstream = request.getInputStream(); ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); byte[] b = new byte[1024]; int len = 0; while((len = inputstream.read(b))!= -1){ outputStream.write(b, 0, len); } String result = new String(outputStream.toByteArray(), "utf-8"); inputstream.close(); outputStream.close(); Map< String, String> map = null; //解析微信通知返回的信息 try { map = WxUtils.doXMLParse(result); } catch (JDOMException e) { LOGGER.info("微信回调失败："+e.getMessage()); } // 若支付成功，则告知微信服务器收到通知 if (SUCCESS.equals(map.get("return_code")) & & SUCCESS.equals(map.get("result_code"))) {/** * ... * 回调业务 *///微信会一直调用接口，直到我们返回SUCCESS String notifyStr = WxUtils.setXML(SUCCESS, ""); writer.write(notifyStr); writer.flush(); } }@Override public void aliCallBack(HttpServletRequest request, HttpServletResponse response) throws IOException { LOGGER.info("进入支付宝回调"); // 获取支付宝GET过来反馈信息 String reqWay = ""; if ("GET".equals(request.getMethod())) { reqWay = "GET"; } Map< String, String> params = new HashMap< String, String> (); Map< ?, ?> requestParams = request.getParameterMap(); for (Iterator< ?> iter = requestParams.keySet().iterator(); iter.hasNext(); ) { String name = (String) iter.next(); String[] values = (String[]) requestParams.get(name); String valueStr = ""; for (int i = 0; i < values.length; i++) { valueStr = (i == values.length - 1) ? valueStr + values[i] : valueStr + values[i] + ","; } // 乱码解决，这段代码在出现乱码时使用。如果mysign和sign不相等也可以使用这段代码转化 if ("GET".equals(reqWay)) { try { valueStr = new String(valueStr.getBytes("ISO-8859-1"), "utf-8"); } catch (UnsupportedEncodingException e) { LOGGER.info("不支持的编码：" + e.getMessage()); } } params.put(name, valueStr); } String tradeNo = request.getParameter("trade_no"); // 支付宝交易号 String tradeStatus = request.getParameter("trade_status"); // 支付状态 String outTradeNo = request.getParameter("out_trade_no"); // 系统订单号 String sellerId = request.getParameter("seller_id"); // 商户号LOGGER.info("支付宝交易号：" + tradeNo + ", 返回状态:" + tradeStatus + ",订单号:" + outTradeNo); Map< String, Object> map = new HashMap< String, Object> (); String result = ""; try { if ("TRADE_SUCCESS".equals(tradeStatus)) { /** * ... * 回调业务 */ } else { result = "fail"; // 为了保证不重复回调 } } catch (Exception e) { result = "fail"; } map.put(result, result); AliUtils.renderText(response, result); }}

3.4 微信退费的时候需要证书，密码默认是商户号，由于项目中使用了多个微信商户号，因此有多个证书，路径和密码放在了数据库中

public class WxRequestHandler{ /** * 退费 * @return */ public Map< String,String> sendWxChanel(String filePath,String pwd) throws Exception{ Map< String,String> map =null; Set es=this.getAllParameters().entrySet(); Iterator it=es.iterator(); StringBuilder sb = new StringBuilder("< xml> "); while(it.hasNext()){ Map.Entry entry = (Map.Entry) it.next(); String k = (String) entry.getKey(); String v = (String) entry.getValue(); sb.append("< "+k+"> "+v+"< /"+k+"> "); } sb.append("< /xml> "); String params=sb.substring(0); String requestUrl = this.getGateUrl(); TenpayHttpClient httpClient = new TenpayHttpClient(); httpClient.setReqContent(requestUrl); String resContent = ""; //filepath 文件路径 pwd 密码 if (httpClient.callHttpPost(requestUrl, params,true,filePath,pwd)) { resContent = httpClient.getResContent(); map=WxUtils.doXMLParse(resContent); } return map; }}

【针对APP的后台支付代码（微信和支付宝）】