微信支付（商户支付模式一）扫码支付接口回调详解

微信支付（商户支付模式一）扫码支付接口回调详解

• 获取用户扫描二维码后，微信返回的信息

InputStream inStream;try {inStream = request.getInputStream();ByteArrayOutputStream outSteam = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while ((len = inStream.read(buffer)) != -1) {outSteam.write(buffer, 0, len);}outSteam.close();inStream.close();String result = new String(outSteam.toByteArray(), "utf-8");//System.out.println(result);/*String xmla = "<xml><appid><![CDATA[wxcb1fe0d]]></appid>"+ "<openid><![CDATA[oBhusSzmARE1xYP9Y]]></openid>"+ "<mch_id><![CDATA[108942]]></mch_id>" + "<is_subscribe><![CDATA[Y]]></is_subscribe>"+ "<nonce_str><![CDATA[jU3nuUAOTTAo]]></nonce_str>"+ "<product_id><![CDATA[ 116027]]></product_id>"+ "<sign><![CDATA[6FFDCCF6AB74DF1220AEEEF4]]></sign>" + "</xml>";*/

• 获取返回的信息内容中各个参数的值
  

Map<String, String> map =ParseXml.callXMLToMap(result);String appid = map.get("appid");String openid = map.get("openid");String mch_id = map.get("mch_id");String is_subscribe = map.get("is_subscribe");String nonce_str = map.get("nonce_str");String product_id = map.get("product_id");String sign = map.get("sign");

• 封装获取到的信息生成签名并生成参数传送给微信后台获取预支付订单

Map<String, String> packageParams = new HashMap<String, String>();packageParams.put("appid", appid);packageParams.put("openid", openid);packageParams.put("mch_id", mch_id);packageParams.put("is_subscribe", is_subscribe);packageParams.put("nonce_str", nonce_str);packageParams.put("product_id", product_id);String paternerKey = "KtPNdgMLgpreh0wUbtMeXrXKtZFPLv3i";String packageSign = CreateSign.getSign(packageParams, paternerKey);//System.out.println("签名返回 :" + packageSign);PayUrlBackController.product_id=product_id;int price = 1;//((int) (Float.valueOf(10) * 100));BillNo billNo=billNoService.select(product_id);if(billNo != null){if(billNo.getAmountrmb() != null && billNo.getAmountrmb().length() > 0){DecimalFormat df = new DecimalFormat("0");String a=billNo.getAmountrmb();float b=Float.valueOf(a);//System.out.println(df.format(b*100));price=Integer.valueOf(df.format(b*100));}else{price = 1;}}// 统一下单文档地址：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1//System.out.println("支付的钱为："+billNo.getAmountrmb());Map<String, String> params = new HashMap<String, String>();params.put("appid", appid);params.put("mch_id", mch_id);params.put("body", "NO."+product_id);String out_trade_no = product_id;//Long.toString(System.currentTimeMillis());params.put("out_trade_no", out_trade_no);params.put("total_fee", price+"");//params.put("total_fee", "1");params.put("attach", out_trade_no);params.put("spbill_create_ip","8.8.8.8");params.put("trade_type", "NATIVE");params.put("nonce_str", System.currentTimeMillis() / 1000 + "");params.put("notify_url", "http://192.168.1.8:8080/WeChat/pay/back");params.put("openid", openid);String paysign = CreateSign.getSign(params, paternerKey);params.put("sign", paysign);byte[] byteXml=ParseXml.callMapToXML(params);String pushXml=new String(byteXml,"UTF-8");//System.out.println("返回的xml数据："+pushXml);String xmlResult=HttpRequest.sendPost("https://api.mch.weixin.qq.com/pay/unifiedorder", pushXml);//System.out.println("prepay_xml：" + xmlResult);

• 如果获取预支付订单成功prepay_id,然后把成功的信息返回给微信服务器

 Map<String, String> payResult = ParseXml.callXMLToMap(xmlResult);            String return_code = payResult.get("return_code");            String result_code = payResult.get("result_code");                        if (StrKit.notBlank(return_code) && StrKit.notBlank(result_code) && return_code.equalsIgnoreCase("SUCCESS")&&result_code.equalsIgnoreCase("SUCCESS")) {                // 以下字段在return_code 和result_code都为SUCCESS的时候有返回                String prepay_id = payResult.get("prepay_id");                                Map<String, String> prepayParams = new HashMap<String, String>();                prepayParams.put("return_code", "SUCCESS");                prepayParams.put("appid", appid);                prepayParams.put("mch_id", mch_id);                prepayParams.put("nonce_str", System.currentTimeMillis() + "");                prepayParams.put("prepay_id", prepay_id);                String prepaySign = null;                if (sign.equals(packageSign)) {                    prepayParams.put("result_code", "SUCCESS");                }else {                    prepayParams.put("result_code", "FAIL");                    prepayParams.put("err_code_des", "订单失效");   //result_code为FAIL时，添加该键值对，value值是微信告诉客户的信息                }                prepaySign =CreateSign.getSign(prepayParams, paternerKey);                prepayParams.put("sign", prepaySign);                byte[] byteXmls=ParseXml.callMapToXML(prepayParams);                String xml=new String(byteXmls);                //System.out.println("最终xml："+xml);                //renderText(xml);

源码地址：http://download.csdn.net/detail/qq_29428121/9869975