微信公众号支付（统一下单 支付结果通知 查询订单）

最近做的项目涉及到微信公众号的支付，翻遍文档和查阅众多资料后，记一下自己整的过程：

1.先看的官方文档，把DEMO下载下来，发现都是要证书的，继续看文档，API列表

2.还是看文档，参数，坑最多的地方，这里需要在工具类里边先配置几个东西，需要在公众号的账号和商户号里面预先设置好

公众号AppId 微信支付商户号 微信支付API秘钥

微信支付通知URL 我用的是内网穿透工具 nat300 映射的已备案域名

3.调用微信统一下单的接口，微信只接收XML格式的字符串，返回的也是XML格式的字符串，主要代码如下：

/*** 微信公众号支付统一下单* @param req* @param request* @return* @throws Exception*/@Overridepublic ServiceResult<Object> unifiedorder(WxOrderReq req, HttpServletRequest request, String openId) {Map<String, String> paraMap = new HashMap<String, String>();paraMap.put("appid", WXPayConfig.APP_ID);paraMap.put("mch_id", WXPayConfig.MCH_ID);paraMap.put("nonce_str", WXPayUtil.generateNonceStr()); //随机字符串，长度要求在32位以内。paraMap.put("body", req.getIntroduce());paraMap.put("out_trade_no", orderNumber);paraMap.put("total_fee", req.getSum().multiply(new BigDecimal(100)).stripTrailingZeros().toPlainString()); //订单总金额，单位为分paraMap.put("spbill_create_ip", IpUtil.getIpAddr(request));paraMap.put("notify_url", WXPayConfig.NOTIFY_URL);paraMap.put("trade_type", WXPayConfig.TRADE_TYPE_JSAPI);paraMap.put("openid", openId);Map<String, String> payMap = new HashMap<String, String>();try {String sign = WXPayUtil.generateSignature(paraMap, WXPayConfig.KEY);//签名，将所有的请求参数按照ASCII字典排序后，按照规定格式拼接成字符串，再使用MD5加密后生成paraMap.put("sign", sign);// 统一下单 https://api.mch./pay/unifiedorderString url = WXPayConfig.UNIFIED_ORDER_URL;String xml = WXPayUtil.mapToXml(paraMap);//将map转成xml格式的 字符串(微信只接受xml格式的字符串)String xmlStr = HttpKit.post(url, xml); //请求微信统一下单接口(微信只返回xml格式的字符串)Map<String, String> map = WXPayUtil.xmlToMap(xmlStr); //将xml格式的字符串转成 map//xmlStr.indexOf("SUCCESS") != -1if (!map.get("return_code").equals("SUCCESS")) {return ServiceResult.newFailure(new CodeMsg(-1,"调用接口失败!!!!!!"));}// 微信生成的预支付会话标识，该值有效期为2小时String prepay_id = map.get("prepay_id");payMap.put("appId", WXPayConfig.APP_ID);payMap.put("timeStamp", String.valueOf(WXPayUtil.getCurrentTimestamp()));payMap.put("nonceStr", WXPayUtil.generateNonceStr());payMap.put("signType", WXPayConfig.SIGNTYPE);payMap.put("package", "prepay_id=" + prepay_id);String paySign = WXPayUtil.generateSignature(payMap, WXPayConfig.KEY);payMap.put("paySign", paySign);payMap.put("outTradeNo",orderNumber);} catch (Exception e) {e.printStackTrace();}//新增订单业务return ServiceResult.newSuccess(payMap);}

4.支付结果通知，这个接口是在工具类中配置好的 微信支付通知url

/*** 支付结果通知* @param request* @param response*/public ServiceResult<Object> getWeChatPayReturn(HttpServletRequest request, HttpServletResponse response){String resSuccessXml = "<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>";String resFailXml = "<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[报文为空]]></return_msg></xml>";String resXml = "";try {InputStream 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);}WXPayUtil.getLogger().info("wxnotify:微信支付----start----");// 获取微信调用我们notify_url的返回信息String result = new String(outSteam.toByteArray(), "utf-8");WXPayUtil.getLogger().info("wxnotify:微信支付----result----=" + result);// 关闭流outSteam.close();inStream.close();// xml转换为mapMap<String, String> resultMap = WXPayUtil.xmlToMap(result);boolean isSuccess = false;if (WXPayConstants.SUCCESS.equalsIgnoreCase(resultMap.get("return_code"))){WXPayUtil.getLogger().info("wxnotify:微信支付----返回成功");if (WXPayUtil.isSignatureValid(resultMap,WXPayConfig.KEY)){// 订单处理 操作 orderconroller 的回写操作?WXPayUtil.getLogger().info("wxnotify:微信支付----验证签名成功");// 通知微信.异步确认成功.必写.不然会一直通知后台.八次之后就认为交易失败了.resXml = resSuccessXml;isSuccess = true;} else {WXPayUtil.getLogger().error("wxnotify:微信支付----判断签名错误");}} else {WXPayUtil.getLogger().error("wxnotify:支付失败,错误信息：" + resultMap.get("return_msg"));resXml = resFailXml;}// 回调方法，处理业务 - 修改订单支付状态WXPayUtil.getLogger().info("wxnotify:微信支付回调：修改的订单===>" + resultMap.get("out_trade_no"));// logger.info("resultMap::::::",resultMap);ServiceResult<Object> updateResult = orderService.updateOrderState(resultMap.get("out_trade_no"));if (updateResult.success()){WXPayUtil.getLogger().info("wxnotify:微信支付回调：修改订单支付状态成功");} else {WXPayUtil.getLogger().error("wxnotify:微信支付回调：修改订单支付状态失败");}} catch (Exception e) {e.printStackTrace();}finally {try {// 处理业务完毕BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());out.write(resXml.getBytes());out.flush();out.close();} catch (IOException e) {WXPayUtil.getLogger().error("wxnotify:支付回调发布异常:out：", e);}}return ServiceResult.newSuccess(resXml);}

5.查询订单 根据订单号向微信发起请求 得知该订单的状态

/*** 查询订单* @param req* @return* @throws Exception*/@Overridepublic ServiceResult<Object> orderQuery(OrderQueryReq req) {String trade_state = null;String accessToken = req.getAccessToken();ObjectResult<User> userByToken = authFeignService.getUserByToken(accessToken);User data = userByToken.getData();if (data == null) {return ServiceResult.newFailure(CodeMsg.ERROR_ACCESS_TOKEN);}Map<String, String> paraMap = new HashMap<String, String>();paraMap.put("appid",WXPayConfig.APP_ID);paraMap.put("mch_id",WXPayConfig.MCH_ID);paraMap.put("nonce_str",WXPayUtil.generateNonceStr()); //随机字符串，长度要求在32位以内。paraMap.put("out_trade_no",req.getOutTradeNo());try {String sign = WXPayUtil.generateSignature(paraMap, WXPayConfig.KEY);//签名，将所有的请求参数按照ASCII字典排序后，按照规定格式拼接成字符串，再使用MD5加密后生成paraMap.put("sign", sign);// 查询订单 https://api.mch./pay/orderqueryString url = WXPayConfig.ORDER_QUERY;String xml = WXPayUtil.mapToXml(paraMap);//将map转成xml格式的 字符串(微信只接受xml格式的字符串)String xmlStr = HttpKit.post(url, xml); //请求微信查询订单接口(微信只返回xml格式的字符串)Map<String, String> map = WXPayUtil.xmlToMap(xmlStr); //将xml格式的字符串转成 mapSystem.err.println(map);trade_state = map.get("trade_state");}catch (Exception e){e.printStackTrace();}//SUCCESS—支付成功 REFUND—转入退款 NOTPAY—未支付 CLOSED—已关闭 REVOKED—已撤销（付款码支付）// USERPAYING--用户支付中（付款码支付） PAYERROR--支付失败(其他原因，如银行返回失败)if ("SUCCESS".equals(trade_state)){return ServiceResult.newSuccess(0);}if ("REFUND".equals(trade_state)){return ServiceResult.newSuccess("转入退款");}if ("NOTPAY".equals(trade_state)){return ServiceResult.newSuccess("未支付");}if ("CLOSED".equals(trade_state)){return ServiceResult.newSuccess("已关闭");}if ("REVOKED".equals(trade_state)){return ServiceResult.newSuccess("已撤销（付款码支付）");}if ("USERPAYING".equals(trade_state)){return ServiceResult.newSuccess("用户支付中（付款码支付）");}if ("PAYERROR".equals(trade_state)){return ServiceResult.newSuccess("支付失败");}return ServiceResult.newSuccess(trade_state);}

比较懒，所以就直接放的代码了，欢迎大家交流指正tansky1995@