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支付宝小程序在前端只能获取到用户昵称和头像，但是这是远远不够的，我们至少需要获取到用户的支付宝User ID，这个时候就必须在后端利用支付宝的SDK来获取了，当然前端要发出 httprequest 请求，下面结合前两篇的例子进行修改

支付宝小程序前端

app.js

App({  globalData:{    studentid:'',    username:'',    apiurl: 'http://XXX'  },   getUserInfo(){    var that = this    return new Promise((resovle,reject)=>{      if(this.userInfo) resovle(this.userInfo);            //调用用户授权 api 获取用户信息      my.getAuthCode({        scopes: 'auth_user',         success:(res) =>{           if (res.authCode) {                 my.httpRequest({               url: that.globalData.apiurl + '/api/AliPay/GetUserInfo',               method: 'GET',               data: {                  auth_code: res.authCode               },               dataType: 'json',               success: function(res) {                  that.globalData.studentid = res.data.data.student_id;                  that.globalData.username = res.data.data.user_name;                  //获取用户信息,照片、昵称                  my.getAuthUserInfo({                    scopes: ['auth_user'],                    success: (res) => {                      that.userInfo = res;                      resovle(that.userInfo);                   },                   fail:() =>{                      reject({});                   }                  });                  console.log('返回UserDetail', res.data.data);                        },               fail: function(res) {                  my.alert({content: 'fail'});               },               complete: function(res) {                  my.hideLoading();               }            });          }        },        fail:() =>{          reject({});        }      });    });  },  onLaunch(options) {  },  onShow(options) {    // 从后台被 scheme 重新打开  },});

上面的代码调取后端webapi http://XXX/api/AliPay/GetUserInfo 来获取用户信息，并把取到的userid,username 存到全局变量 globalData 里面

const app = getApp();Page({  data: {    src: '',    username: '',    studentid: ''  },  imageError: function (e) {    console.log('image 发生错误', e.detail.errMsg)  },  imageLoad: function (e) {    console.log('image 加载成功', e);  },  onLoad(query) {    // 页面加载    app.getUserInfo().then(      user => {            console.info(user);            //设置头像            if (user.avatar.length > 0) {               this.setData({src: user.avatar});            }            else{               this.setData({src: '/images/tou.png'});            }             //设置用户名                if (app.globalData.username)            {               this.setData({username: app.globalData.username});            }            else            {               this.setData({username: user.nickName});            }            if(app.globalData.studentid)            {               //设置UserId               this.setData({studentid: app.globalData.studentid});             }        }    );  },  onShow() {    // 页面显示         },  onReady() {       }});

本来官方只提供了.net framwork 的SDK，但网上已经有人移植了.net core 的版本，运行 Install-Package Alipay.AopSdk.Core 进行安装，在 appsettings.json 进行如下的配置，写上你的小程序公匙，私匙，appid 等参数 uid 可以不写

  "Alipay": {    //校园码支付宝小程序正式环境    "AlipayPublicKey": "",    "AppId": "",    "CharSet": "UTF-8",    "GatewayUrl": "https://openapi.alipay.com/gateway.do",    "PrivateKey": "",    "SignType": "RSA2",    "Uid": ""  }

然后在后端core还需要注入Service

Startup.cs 代码就补贴全部了，只贴相关的，这段代码就干这么个事，读取 appsettings.json 并注入服务

        private void ConfigureAlipay(IServiceCollection services)        {            var alipayOptions = Configuration.GetSection("Alipay").Get<AlipayOptions>();            //检查RSA私钥            AlipayConfigChecker.Check(alipayOptions.SignType, alipayOptions.PrivateKey);            services.AddAlipay(options => options.SetOption(alipayOptions)).AddAlipayF2F();        }        public IConfiguration Configuration { get; }        // This method gets called by the runtime. Use this method to add services to the container.        public void ConfigureServices(IServiceCollection services)        {            //配置alipay服务            ConfigureAlipay(services);            ......

在得到从前端传过来的授权码之后，利用授权得到用户信息

        private AlipayUserInfoShareResponse GetShareResponse(string auth_code)        {            var alipaySystemOauthTokenRequest = new AlipaySystemOauthTokenRequest            {                Code = auth_code,                GrantType = "authorization_code"            };            var oauthTokenResponse = _alipayService.Execute(alipaySystemOauthTokenRequest);            AlipayUserInfoShareRequest requestUser = new AlipayUserInfoShareRequest();            AlipayUserInfoShareResponse userinfoShareResponse = _alipayService.Execute(requestUser, oauthTokenResponse.AccessToken);            return userinfoShareResponse;        }        /// <summary>        /// 获取用户信息        /// </summary>        /// <param name="auth_code"></param>        /// <returns></returns>        [HttpGet]        [Route("GetUserInfo")]        public ActionResult GetUserInfo(string auth_code)        {            try            {                AlipayUserInfoShareResponse userinfoShareResponse = GetShareResponse(auth_code);                return new JsonResult(new { data = userinfoShareResponse });            }            catch (Exception ex)            {                log.Error("错误:" + ex.ToString());                return new JsonResult(new { data = ex.ToString() });            }        }

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