.net-自定义微信分享

1.需要微信服务号的appid，密钥

2.微信公众平台添加白名单，配置js安全域名

3.需要把配置安全js域名时提供的文件放在网站的根目录下

4.前端调用后台接口，获取ticket

5.后台根据appid、密钥来调微信接口获取token、ticket

下面是js里的函数，功能是从接口获取ticket，然后自定义分享

function weixin_share(wxTitle,wxCon,wxIMg){
    var wxurl = location.href.split('#')[0].toString();
    // wxurl=encodeURIComponent(wxurl);
    var ua = navigator.userAgent.toLowerCase();
    //if (ua.match(/MicroMessenger/i) == "micromessenger") {
        $.ajax({
            type: "POST",
            url: "/api/GetWeXinData",
            dataType: "json",
            async: false,
            data: {
                wxurl: wxurl
            },
            success: function (data) {
                console.log(data)
                if (data.status == "ok") {
                    wx.config({
                        debug: false,
                        appId: data.appid,
                        timestamp: data.timestamp,
                        nonceStr: data.nonceStr,
                        signature: data.signature,
                        jsApiList: [
                            'checkJsApi',
                            'onMenuShareTimeline',//分享朋友圈
                            'onMenuShareAppMessage',//分享微信好友
                            'onMenuShareQQ',//分享QQ好友
                            'onMenuShareWeibo',//分享腾讯微博
                            'onMenuShareQZone'//分享QQ空间
                        ]
                    });
                }
            },
            error: function (xhr, status, error) {
                console.log(status);
                console.log(xhr.responseText);
            },
        });

        function checkJsApi() {
            wx.checkJsApi({
                jsApiList: ['checkJsApi', 'onMenuShareTimeline', 'onMenuShareAppMessage',//分享微信好友
                        'onMenuShareQQ',//分享QQ好友
                        'onMenuShareWeibo',//分享腾讯微博
                        'onMenuShareQZone'//分享QQ空间
                ],
                success: function (res) {
                    // 以键值对的形式返回，可用的api值true，不可用为false
                    // 如：{"checkResult":{"chooseImage":true},"errMsg":"checkJsApi:ok"}
                    //var jon = $.parseJSON(res);
                    console.log("判断接口是否被支持:" + jon.errMsg.checkJsApi);
                }
            });
        }

        //分享微信朋友圈
        function onMenuShareTimeline() {
            wx.onMenuShareTimeline({
                title: wxTitle,
                link: wxurl,
                imgUrl: wxIMg,
                trigger: function (res) {
                    console.log('click shared');
                },
                success: function (res) {
                    console.log('分享成功!');
                    console.log(res);
                },
                cancel: function (res) {
                    console.log('shared cancle');
                    console.log(res);
                },
                fail: function (res) {
                    console.log("分享失败"+res);
                    console.log(JSON.stringify(res));
                }
            });
        }

        //分享微信好友
        function onMenuShareAppMessage() {
            wx.onMenuShareAppMessage({
                title: wxTitle,
                desc: wxCon,
                link: wxurl,
                imgUrl: wxIMg,
                trigger: function (res) {
                    // 不要尝试在trigger中使用ajax异步请求修改本次分享的内容，因为客户端分享操作是一个同步操作，这时候使用ajax的回包会还没有返回
                    console.log('用户点击发送给朋友');
                },
                success: function (res) {
                    console.log('已分享');
                },
                cancel: function (res) {
                    console.log('已取消');
                },
                fail: function (res) {
                    console.log(JSON.stringify(res));
                }
            });
        }

        function onMenuShareQQ() {
            wx.onMenuShareQQ({
                title: wxTitle,
                desc: wxCon,
                link: wxurl,
                imgUrl: wxIMg,
                trigger: function (res) {
                    console.log('用户点击分享到QQ');
                },
                complete: function (res) {
                    console.log(JSON.stringify(res));
                },
                success: function (res) {
                    console.log('已分享');
                },
                cancel: function (res) {
                    console.log('已取消');
                },
                fail: function (res) {
                    console.log('分享成功!');
                    console.log(JSON.stringify(res));
                }
            });
        }

        function onMenuShareQZone() {
            wx.onMenuShareQZone({
                title: wxTitle,
                desc: wxCon,
                link: wxurl,
                imgUrl: wxIMg,
                trigger: function (res) {
                    console.log('用户点击分享到QZone');
                },
                complete: function (res) {
                    console.log(JSON.stringify(res));
                },
                success: function (res) {
                    console.log('已分享');
                },
                cancel: function (res) {
                    console.log('已取消');
                },
                fail: function (res) {
                    console.log(JSON.stringify(res));
                    console.log('分享失败!');
                }
            });
        }

        wx.ready(function () {
            checkJsApi();
            onMenuShareTimeline();
            onMenuShareQZone();
            onMenuShareQQ();
            onMenuShareAppMessage();
        });

        wx.error(function (res) {
            console.log(res.errMsg);
        });
    //}
}

　　js部分就是上面的。不要忘了，html中应引用js和自定义标题，图片等

<script src="https://res.wx.qq.com/open/js/jweixin-1.2.0.js"></script>
    <script src="~/js/WX_share.js"></script>
    <script>weixin_share('描述', '标题', '/图片/weixin.jpg')</script>

　接下来就是后台接口的实现了：

 public ActionResult GetWeXinData()
        {
            Signature sg = new Signature();
            long timeout = 7200;//过期时间7200s
            try
            {
                String url = Request["wxurl"];
                if (string.IsNullOrEmpty(url))
                {
                    sg.status = "error";
                }
                sg.appid = ConfigurationManager.AppSettings["wx_appid"];//获取appid
                string secret= ConfigurationManager.AppSettings["wx_secret"];//获取密钥
                sg.wxurl = url;
                sg.nonceStr = WXJsJdkHelper.GetNonceStr();
                sg.timestamp = WXJsJdkHelper.GetTimestamp();
                var accesstoken = CacheHelper.GetCache("accesstoken_");//从缓存中获取，不能频繁的调用微信服务器接口，一天有次数限制
                string token = "";
                if (accesstoken == null)
                {
                    WXJsJdkHelper.GetAccessToken(sg.appid, secret, out token);
                    CacheHelper.SetCacheDateTime("accesstoken_", token, timeout);
                }else
                {
                    token = accesstoken.ToString();
                }
                var wxticket = CacheHelper.GetCache("wxticket_");
                if (wxticket == null)
                {
                    sg.wxticket = WXJsJdkHelper.GetJsAPITicket(token);
                    CacheHelper.SetCacheDateTime("wxticket_", sg.wxticket, timeout);
                }else
                {
                    sg.wxticket = wxticket.ToString();
                }
                LogHelper.WriteLog("获取微信token:"+ accesstoken+ "ticket" + sg.wxticket);

                sg.status = "ok";

                sg.signature = WXJsJdkHelper.GetSHA1Value(WXJsJdkHelper.GetNonSHA1HashSignature(sg.nonceStr, sg.wxticket, sg.timestamp, sg.wxurl));
                return Json(sg, JsonRequestBehavior.AllowGet);
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog("获取微信签名配置信息时错误:", ex);
                sg.status = "error";
                sg.nonceStr = string.Empty;
                sg.signature = string.Empty;
                sg.timestamp = string.Empty;
                sg.wxurl = string.Empty;
                sg.wxticket = string.Empty;
                return Json(sg, JsonRequestBehavior.AllowGet);
            }
        }

　　获取AccessToken的方法

 public static bool GetAccessToken(string appid, string secret, out string res)
        {
            //正确的返回值格式{"access_token":"rcSFy_BaOHfW92AdXmer1ec4yLbMYeW3Sl3N29uKM96cRJnfZkpxUTr9VTw7ih4S9OY9tTqd5c697iNWVeXesqVPWFRi5pLRAnyPJNw7aMhIaK_dJDo3cxoXfyahUtyAOGXiAAATLC","expires_in":7200}
            //错误返回值格式{"errcode":40013,"errmsg":"invalid appid"}
            string strJson = GetJsonData(string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", appid, secret), "get");
            string access_token = GetJsonValue(strJson, "access_token");
            if (string.IsNullOrEmpty(access_token))
            {
                res = GetJsonValue(strJson, "errcode");
                return false;
            }
            res = access_token;
            return true;
        }

根据accesstoken获取对应的JsAPITicket的方法

 public static string GetJsAPITicket(string accesstoken)
        {
            string strJson = GetJsonData(string.Format("https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token={0}&type=jsapi", accesstoken), "get");
            string jsapiticket = GetJsonValue(strJson, "ticket");

            if (string.IsNullOrEmpty(jsapiticket))
            {
                return GetJsonValue(strJson, "errcode");
            }
            return jsapiticket;
        }

　　获取SHA1Value值

public static string GetSHA1Value(string str_sha1_in)
        {
            SHA1 sha1 = new SHA1CryptoServiceProvider();
            byte[] bytes_sha1_in = System.Text.UTF8Encoding.Default.GetBytes(str_sha1_in);
            byte[] bytes_sha1_out = sha1.ComputeHash(bytes_sha1_in);
            string str_sha1_out = BitConverter.ToString(bytes_sha1_out);
            str_sha1_out = str_sha1_out.Replace("-", "").ToLower();
            return str_sha1_out;
        }

　　//

缓存的CatchHelper.cs

/// <summary>
        /// 获取数据缓存
        /// </summary>
        /// <param name="CacheKey">键</param>
        public static object GetCache(string CacheKey)
        {
            Cache objCache = HttpRuntime.Cache;
            if (objCache[CacheKey] == null)
                return null;
            else
                return objCache[CacheKey];
        }

 public static void SetCacheDateTime(string CacheKey, object objObject, long Seconds)
        {
            Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject, null, System.DateTime.Now.AddSeconds(Seconds), TimeSpan.Zero);
        }