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前言

　　微信公眾號開發(fā)又一重要項就是微信支付，如何在微信公眾號中或者微信自帶的瀏覽器中實現(xiàn)微信支付呢？這就是本文的目的。
　　對于微信支付有幾種分類，一種是app支付（顧名思義給予一些軟件app使用的）、微信內(nèi)H5支付（什么意思呢，就是微信內(nèi)置的瀏覽器自帶了一些js、css文件，當然是微信特有的，上篇博客有講過，獲取到的用戶昵稱帶表情會亂碼，在微信自帶的瀏覽器你只要將它裝換為utf-8就能正常顯示，原因是內(nèi)置瀏覽器有對應的font文件，所以在內(nèi)置瀏覽器中也有包含了支付功能的js文件，沒錯在微信自帶的瀏覽器中你不用在你的html中引入js都可以使用它的內(nèi)置js，本文會講解如何用它的js調起支付）、其它PC端瀏覽器的掃碼支付。

開發(fā)流程

• 服務器
  　　同樣需要服務器，然后設置服務器的域名，比如這里還是設置域名為：www.show.netcome.net。

• 配置公眾號收集信息
  　　首先需要一個有微信支付權限和網(wǎng)頁授權權限的公眾號，其次需要一個有微信支付權限的商戶號（商戶號就是支付的錢到哪里）。同樣，登錄公眾平臺在開發(fā)–>基本配置–>公眾號開發(fā)信息里找到公眾號的開發(fā)者ID(AppID)和開發(fā)者密碼(AppSecret) ，然后在微信商戶平臺里找到mch_id和api密鑰。
  　　注意：必須先在微信公眾平臺設置網(wǎng)頁授權域名（這個域名你就填服務器的www.show.netcome.net）和在微信商戶平臺設置您的公眾號支付支付目錄，設置路徑：商戶平臺–>產(chǎn)品中心–>開發(fā)配置–>公眾號支付–>添加（添加一個支付url，比如你的支付頁面是：www.show.netcome.net/payment）。公眾號支付在請求支付的時候會校驗請求來源是否有在商戶平臺做了配置，所以必須確保支付目錄已經(jīng)正確的被配置，否則將驗證失敗，請求支付不成功。

• 開發(fā)流程
  　　微信支付不是說一開始就傳訂單編號、價格、商品等信息去調用支付的，在調用支付接口前我們需要先去向微信發(fā)起下單請求，只有發(fā)起下單成功后才能調用支付接口。
  　　首先配置你的公眾號、商戶和回調頁面信息，其它值做相應修改，參數(shù)文件如下：

# -*- coding: utf-8 -*-# ----------------------------------------------# @Time    : 18-3-21 上午11:50# @Author  : YYJ# @File    : wechatConfig.py# @CopyRight: ZDWL# ----------------------------------------------"""微信公眾號和商戶平臺信息配置文件"""# ----------------------------------------------微信公眾號---------------------------------------------- ## 公眾號idAPPID = 'appid'# 公眾號AppSecretAPPSECRET = 'appscrect'# ----------------------------------------------微信商戶平臺---------------------------------------------- ## 商戶idMCH_ID = 'mc_id'# 商戶API秘鑰API_KEY = 'api秘鑰'# ----------------------------------------------回調頁面---------------------------------------------- ## 用戶授權獲取code后的回調頁面，如果需要實現(xiàn)驗證登錄就必須填寫REDIRECT_URI = 'http://meili.netcome.net/index'PC_LOGIN_REDIRECT_URI = 'http://meili.netcome.net/index'defaults = {    # 微信內(nèi)置瀏覽器獲取code微信接口    'wechat_browser_code': 'https://open.weixin.qq.com/connect/oauth2/authorize',    # 微信內(nèi)置瀏覽器獲取access_token微信接口    'wechat_browser_access_token': 'https://api.weixin.qq.com/sns/oauth2/access_token',    # 微信內(nèi)置瀏覽器獲取用戶信息微信接口    'wechat_browser_user_info': 'https://api.weixin.qq.com/sns/userinfo',    # pc獲取登錄二維碼接口    'pc_QR_code': 'https://open.weixin.qq.com/connect/qrconnect',    # 獲取微信公眾號access_token接口    'mp_access_token': 'https://api.weixin.qq.com/cgi-bin/token',    # 設置公眾號行業(yè)接口    'change_industry': 'https://api.weixin.qq.com/cgi-bin/template/api_set_industry',    # 獲取公眾號行業(yè)接口    'get_industry': 'https://api.weixin.qq.com/cgi-bin/template/get_industry',    # 發(fā)送模板信息接口    'send_templates_message': 'https://api.weixin.qq.com/cgi-bin/message/template/send',    # 支付下單接口    'order_url': 'https://api.mch.weixin.qq.com/pay/unifiedorder',}SCOPE = 'snsapi_userinfo'PC_LOGIN_SCOPE = 'snsapi_login'GRANT_TYPE = 'client_credential'STATE = ''LANG = 'zh_CN'

下面就是支付下單和支付接口調用的封裝代碼了，其中包括了上一篇博客的授權登錄代碼和下一篇博客的發(fā)送模板消息的代碼封裝：

# -*- coding: utf-8 -*-# ----------------------------------------------# @Time    : 18-3-21 下午1:36# @Author  : YYJ# @File    : WechatAPI.py# @CopyRight: ZDWL# ----------------------------------------------import hashlibimport randomimport timefrom urllib import parsefrom xml.etree.ElementTree import fromstringimport requestsfrom src.beauty.main.wechat.config import wechatConfigclass WechatAPI(object):    def __init__(self):        self.config = wechatConfig        self._access_token = None        self._openid = None        self.config = wechatConfig        self.dic = {}    @staticmethod    def process_response_login(rsp):        """解析微信登錄返回的json數(shù)據(jù)，返回相對應的dict, 錯誤信息"""        if 200 != rsp.status_code:            return None, {'code': rsp.status_code, 'msg': 'http error'}        try:            content = rsp.json()        except Exception as e:            return None, {'code': 9999, 'msg': e}        if 'errcode' in content and content['errcode'] != 0:            return None, {'code': content['errcode'], 'msg': content['errmsg']}        return content, None    def process_response_pay(self, rsp):        """解析微信支付下單返回的json數(shù)據(jù)，返回相對應的dict, 錯誤信息"""        rsp = self.xml_to_array(rsp)        if 'SUCCESS' != rsp['return_code']:            return None, {'code': '9999', 'msg': rsp['return_msg']}        if 'prepay_id' in rsp:            return {'prepay_id': rsp['prepay_id']}, None        return rsp, None    @staticmethod    def create_time_stamp():        """產(chǎn)生時間戳"""        now = time.time()        return int(now)    @staticmethod    def create_nonce_str(length=32):        """產(chǎn)生隨機字符串，不長于32位"""        chars = "abcdefghijklmnopqrstuvwxyz0123456789"        strs = []        for x in range(length):            strs.append(chars[random.randrange(0, len(chars))])        return "".join(strs)    @staticmethod    def xml_to_array(xml):        """將xml轉為array"""        array_data = {}        root = fromstring(xml)        for child in root:            value = child.text            array_data[child.tag] = value        return array_data    def get_sign(self):        """生成簽名"""        # 簽名步驟一：按字典序排序參數(shù)        key = sorted(self.dic.keys())        buffer = []        for k in key:            buffer.append("{0}={1}".format(k, self.dic[k]))        # self.dic["paySign"] = self.get_sign(jsApiObj)        parm = "&".join(buffer)        # 簽名步驟二：在string后加入KEY        parm = "{0}&key={1}".format(parm, self.config.API_KEY).encode('utf-8')        # 簽名步驟三：MD5加密        signature = hashlib.md5(parm).hexdigest()        # 簽名步驟四：所有字符轉為大寫        result_ = signature.upper()        return result_    def array_to_xml(self, sign_name=None):        """array轉xml"""        if sign_name is not None:            self.dic[sign_name] = self.get_sign()        xml = ["<xml>"]        for k in self.dic.keys():            xml.append("<{0}>{1}</{0}>".format(k, self.dic[k]))        xml.append("</xml>")        return "".join(xml)class WechatLogin(WechatAPI):    def get_code_url(self):        """微信內(nèi)置瀏覽器獲取網(wǎng)頁授權code的url"""        url = self.config.defaults.get('wechat_browser_code') + (            '?appid=%s&redirect_uri=%s&response_type=code&scope=%s&state=%s#wechat_redirect' %            (self.config.APPID, parse.quote(self.config.REDIRECT_URI),             self.config.SCOPE, self.config.STATE if self.config.STATE else ''))        return url    def get_code_url_pc(self):        """pc瀏覽器獲取網(wǎng)頁授權code的url"""        url = self.config.defaults.get('pc_QR_code') + (            '?appid=%s&redirect_uri=%s&response_type=code&scope=%s&state=%s#wechat_redirect' %            (self.config.APPID, parse.quote(self.config.REDIRECT_URI), self.config.PC_LOGIN_SCOPE,             self.config.STATE if self.config.STATE else ''))        return url    def get_access_token(self, code):        """獲取access_token"""        params = {            'appid': self.config.APPID,            'secret': self.config.APPSECRET,            'code': code,            'grant_type': 'authorization_code'        }        token, err = self.process_response_login(requests                                                 .get(self.config.defaults.get('wechat_browser_access_token'),                                                      params=params))        if not err:            self._access_token = token['access_token']            self._openid = token['openid']        return self._access_token, self._openid    def get_user_info(self, access_token, openid):        """獲取用戶信息"""        params = {            'access_token': access_token,            'openid': openid,            'lang': self.config.LANG        }        return self.process_response_login(requests                                           .get(self.config.defaults.get('wechat_browser_user_info'), params=params))class WechatTemplates(WechatAPI):    def __init__(self):        super().__init__()        self.mp_access_token = None        self.mp_expires_in = None    def get_mp_access_token(self):        """獲取公眾號的access_token"""        # err_code = {        #     '-1': '系統(tǒng)繁忙，請稍候再試',        #     '0': '請求成功',        #     '40001': 'AppSecret錯誤或者AppSecret不屬于這個公眾號，請開發(fā)者確認AppSecret的正確性',        #     '40002': '請確保grant_type字段值為client_credential',        #     '40164': '調用接口的IP地址不在白名單中，請在接口IP白名單中進行設置',        # }        url = self.config.defaults.get('mp_access_token') + (            '?grant_type=%s&appid=%s&secret=%s' %            (self.config.GRANT_TYPE,  self.config.APPID,             self.config.APPSECRET))        token_data = eval(requests.get(url).content)        if 'access_token' not in token_data:            return token_data['errcode'], token_data['errmsg'], False        else:            self.mp_access_token = token_data['access_token']            self.mp_expires_in = token_data['expires_in']            return self.mp_access_token, self.mp_expires_in, True    # 以下功能暫不使用    # def change_industry(self):    #     """設置所屬行業(yè)，每月可修改行業(yè)1次"""    #     url = self.config.defaults.get('change_industry') + (    #         '?access_token=%s' % self.mp_access_token)    #     prams = {    #         "industry_id1": "23",    #         "industry_id2": "31"    #     }    #     data = requests.post(url, prams)    #    # def get_industry(self):    #     """獲取行業(yè)信息"""    #     if self.mp_access_token is None:    #         _, msg, success = self.get_mp_access_token()    #         if not success:    #             return msg, False    #     url = self.config.defaults.get('get_industry') + (    #         '?access_token=%s' % self.mp_access_token)    #     industry_data = requests.get(url)    #     if 'primary_industry' in industry_data:    #         primary_industry = industry_data['primary_industry']    #         secondary_industry = industry_data['secondary_industry']    #         return primary_industry, secondary_industry, True    #     else:    #         return '', '獲取行業(yè)信息錯誤', False    #    # def get_templates_id(self):    #     pass    #    def send_templates_message(self, touser, template_id, data, url=None, miniprogram=None):        post_data = {            "touser": touser,            "template_id": template_id,            "data": data        }        if url is not None:            post_data['url'] = url        if miniprogram is not None:            post_data['miniprogram'] = miniprogram        url = self.config.defaults.get('send_templates_message') + (            '?access_token=%s' % self.mp_access_token)        back_data = requests.post(url, json=post_data)        print(back_data)        if "errcode" in back_data and back_data["errcode"] == 0:            return True        else:            return Falseclass WechatPayAPI(WechatAPI):    def __init__(self, package, sign_type=None):        super().__init__()        self.appId = self.config.APPID        self.timeStamp = self.create_time_stamp()        self.nonceStr = self.create_nonce_str()        self.package = package        self.signType = sign_type        self.dic = {"appId": self.appId, "timeStamp": "{0}".format(self.create_time_stamp()),                    "nonceStr": self.create_nonce_str(), "package": "prepay_id={0}".format(self.package)}        if sign_type is not None:            self.dic["signType"] = sign_type        else:            self.dic["signType"] = "MD5"    def get_dic(self):        self.dic['paySign'] = self.get_sign()        return self.dicclass WechatOrder(WechatAPI):    def __init__(self, body, trade_type, out_trade_no, total_fee, spbill_create_ip, notify_url, device_info=None,                 sign_type=None, attach=None, fee_type=None, time_start=None, time_expire=None, goods_tag=None,                 product_id=None, detail=None, limit_pay=None, openid=None, scene_info=None):        super().__init__()        self.device_info = device_info  #        self.nonce_str = self.create_nonce_str()        self.sign_type = sign_type  #        self.detail = detail  #        self.body = body        self.attach = attach  #        self.out_trade_no = out_trade_no        self.fee_type = fee_type  #        self.total_fee = total_fee        self.spbill_create_ip = spbill_create_ip        self.time_start = time_start  #        self.time_expire = time_expire  #        self.goods_tag = goods_tag  #        self.notify_url = notify_url        self.trade_type = trade_type        self.product_id = product_id  #        self.limit_pay = limit_pay  #        self.openid = openid  #        self.scene_info = scene_info  #        self.dic = {"appid": self.config.APPID, "mch_id": self.config.MCH_ID,                    "nonce_str": self.nonce_str, "body": self.body,                    'out_trade_no': out_trade_no,                    'openid': self.openid,                    "total_fee": self.total_fee, "spbill_create_ip": self.spbill_create_ip,                    "notify_url": self.notify_url,                    "trade_type": self.trade_type}        if self.device_info is not None:            self.dic["device_info"] = self.device_info        if self.sign_type is not None:            self.dic["sign_type"] = self.sign_type        if self.detail is not None:            self.dic["detail"] = self.detail        if self.attach is not None:            self.dic["attach"] = self.attach        if self.fee_type is not None:            self.dic["fee_type"] = self.fee_type        if self.time_start is not None:            self.dic["time_start"] = self.time_start        if self.time_expire is not None:            self.dic["time_expire"] = self.time_expire        if self.goods_tag is not None:            self.dic["goods_tag"] = self.goods_tag        if self.product_id is not None:            self.dic["product_id"] = self.product_id        if self.limit_pay is not None:            self.dic["limit_pay"] = self.limit_pay        if self.openid is not None:            self.dic["openid"] = self.openid        if self.scene_info is not None:            self.dic["scene_info"] = self.scene_info    def order_post(self):        if self.config.APPID is None:            return None, True        xml_ = self.array_to_xml('sign')        data = requests.post(self.config.defaults['order_url'], data=xml_.encode('utf-8'),                             headers={'Content-Type': 'text/xml'})        return self.process_response_pay(data.content)

　　上面的WechatOrder類就是支付下單，WechatPayAPI類是支付請求，你看官方文檔的支付接口，可能剛開始你會問怎么調用這個接口不傳商品信息和價格信息啊，其實這些信息是在支付下單的時候傳過去的，下單需要的參數(shù)如下（根據(jù)你的需要填寫非必須的字段）：

接著是我的urls.py文件中加一個下單支付請求url和支付結果返回回調url：

from django.conf.urls import urlfrom src.beauty.main.wechat.apps.index.views import AuthView, GetInfoView, WechatPayurlpatterns = [    url(r'^$', views.home),    # 支付下單及請求    url(r'^wechatPay$', WechatPay.as_view()),    # 授權請求    url(r'^auth/$', AuthView.as_view()),    # 之前的授權回調頁面    url(r'^index$', GetInfoView.as_view()),    # 調起支付后返回結果的回調頁面    url(r'^success$', views.success),    # 這里我省掉了我的其它頁面]

然后是我的views.py文件，我只展示支付和結果返回的view：

from django.contrib.auth import logout, authenticate, loginfrom django.contrib.auth.backends import ModelBackend# from django.core import serializersimport jsonimport requestsimport base64import randomimport timefrom datetime import datetime, datefrom django.core.serializers.json import DjangoJSONEncoderfrom django.db.models import Qfrom django.http import HttpResponse, HttpResponseServerErrorfrom django.shortcuts import render, redirect# from src.beauty.main.wechat.utils.wechatAPI import WechatAPIfrom src.beauty.main.wechat.utils.WechatAPI import WechatLogin, WechatTemplates, WechatOrder, WechatPayAPIfrom django.views.generic import Viewfrom django.conf import settingsfrom django.http import HttpResponseRedirectclass WechatPay(View):    @staticmethod    def post(request):        # 這個if判斷是我傳入的訂單的id，測試的時候沒有傳入，你可以測試的時候去掉這個判斷        if 'order' in request.POST:            # order = request.POST['order']            # order = Order.objects.filter(is_effective=True).filter(uuid=order).first()            body = 'JSP支付測試'            trade_type = 'JSAPI'            import random            rand = random.randint(0, 100)            out_trade_no = 'HSTY3JMKFHGA325' + str(rand)            total_fee = 1            spbill_create_ip = '127.0.0.1'            notify_url = 'http://www.show.netcome.net/success'            order = WechatOrder(body=body,                                trade_type=trade_type,                                out_trade_no=out_trade_no,                                openid=request.session['openid'],                                total_fee=total_fee,                                spbill_create_ip=spbill_create_ip,                                notify_url=notify_url)            datas, error = order.order_post()            if error:                return HttpResponseServerError('get access_token error')            order_data = datas['prepay_id'].encode('iso8859-1').decode('utf-8'),            pay = WechatPayAPI(package=order_data[0])            dic = pay.get_dic()            dic["package"] = "prepay_id=" + order_data[0]            return HttpResponse(json.dumps(dic), content_type="application/json")def success(request):    # 這里寫支付結果的操作，重定向    return redirect('/')

最后在你的需要支付頁面的html中添加如下：

<script>    function onBridgeReady(data){        WeixinJSBridge.invoke(            'getBrandWCPayRequest', {                "appId": data.appId,     //公眾號名稱，由商戶傳入                     "timeStamp": data.timeStamp,         //時間戳，自1970年以來的秒數(shù)                     "nonceStr": data.nonceStr, //隨機串                     "package": data.package, //訂單id,這是微信下單微信生成的訂單id不是你自己的                "signType":"MD5",         //微信簽名方式：                     "paySign": data.paySign //微信簽名             }, function(res){                if(res.err_msg == "get_brand_wcpay_request:ok" ) {                    # 支付成功的跳轉頁面，我這里跳到了首頁                    window.location.href = '/';                }     // 使用以上方式判斷前端返回,微信團隊鄭重提示：res.err_msg將在用戶支付成功后返回ok，但并不保證它絕對可靠。            });    }    # 點擊支付的響應函數(shù)，調起下單請求，并返回支付需要上傳的數(shù)據(jù)（都在data里）    $('#wechatPay').click(function(){        var order = $(this).data('parm');        $.ajaxSetup({            data: {csrfmiddlewaretoken: '{{ csrf_token }}'},        });        $.ajax({            type: 'POST',            url: '/wechatPay',            data: {                'order': order            },            dataType: 'json',            success: function (data) {                if (typeof WeixinJSBridge == "undefined"){                    if( document.addEventListener ){                        document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);                    }else if (document.attachEvent){                        document.attachEvent('WeixinJSBridgeReady', onBridgeReady);                        document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);                    }                }else{                    onBridgeReady(data);                }            },            error: function () {            }        });    });</script>

結語

中間配置有問題歡迎留言，這是我的調用結果：