asp.net微信开发第十篇----使用百度编辑器编辑图文消息，上传图片、微信视频

  $(document).ready(function () {


             var ue = UE.getEditor('tbContent');

             //重写UEDITOR的getActionUrl 方法,定义自己的Action,上传图片保存至相应的位置
             UE.Editor.prototype._bkGetActionUrl = UE.Editor.prototype.getActionUrl;
             UE.Editor.prototype.getActionUrl = function (action) {
                 if (action == 'uploadimage' || action == 'uploadfile') {
                     var id = $('#carInfoId').val();
                     return '/UpLoadWeiXinImgHander.ashx';
                 } else {
                     return this._bkGetActionUrl.call(this, action);
                 }
             };

         });

 /// <summary>
    /// UpLoadWeiXinImgHander 的摘要说明
    /// </summary>
    public class UpLoadWeiXinImgHander : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
              ///'遍历File表单元素
            HttpFileCollection files = HttpContext.Current.Request.Files;
            for (int iFile = 0; iFile < files.Count; iFile++)
            {
                //    ///'检查文件扩展名字
                HttpPostedFile postedFile = files[iFile];
                //HttpPostedFile postedFile = files[0];
                string fileName;   //, fileExtension
                fileName = System.IO.Path.GetFileName(postedFile.FileName);

                string fileContentType = postedFile.ContentType.ToString();
                if (fileContentType == "image/gif" ||
                    fileContentType == "image/png" || fileContentType == "image/x-png" || fileContentType == "image/jpeg"
                    || fileContentType == "image/pjpeg")
                {
                    if (postedFile.ContentLength <= 2097152)
                    {
                        string filepath = postedFile.FileName;      //得到的是文件的完整路径,包括文件名，如：C:Documents and SettingsAdministratorMy DocumentsMy Pictures20022775_m.jpg 
                        //string filepath = FileUpload1.FileName;               //得到上传的文件名20022775_m.jpg 

                        string filename = filepath.Substring(filepath.LastIndexOf("\") + 1);//20022775_m.jpg 

                        string serverpath = context.Server.MapPath("~/WeiXinImg/") + fileName;//取得文件在服务器上保存的位置C:InetpubwwwrootWebSite1images20022775_m.jpg 


                        //保存到本地文件夹
                        postedFile.SaveAs(serverpath);//上传图片到服务器指定地址

                        ////context.Request.Url.Authority.ToString()获取当前主机头或IP地址+端口号
                        //string imageurlpath = "http://" + context.Request.Url.Authority.ToString() + "/WeiXinImg/" + fileName;


                        //上传图片素材至微信服务器获取图片Url
                        WeiXinServer wxs = new WeiXinServer();
                        ///从缓存读取accesstoken
                        string Access_token = context.Cache["Access_token"] as string;
                        if (Access_token == null)
                        {
                            //如果为空，重新获取
                            Access_token = wxs.GetAccessToken();

                            //设置缓存的数据7000秒后过期
                            context.Cache.Insert("Access_token", Access_token, null, DateTime.Now.AddSeconds(7000), System.Web.Caching.Cache.NoSlidingExpiration);
                        }
                        string Access_tokento = Access_token.Substring(17, Access_token.Length - 37);

                        string url = string.Format("https://api.weixin.qq.com/cgi-bin/media/uploadimg?access_token={0}&type={1}", Access_tokento, "image");

                        string res = HttpUploadFile(url, serverpath);
                        //判断res结果集里面是否包含media_id
                        if (res.Contains("url"))
                        {
                            //如果能进行到这里，那说明图片已经上传至微信服务器，是永久素材哦，
                            //开始解析json串，使用前需要引用Newtonsoft.json.dll文件
                            JObject jsonObj = JObject.Parse(res);


                            string state = "SUCCESS";
                            //返回上传信息
                            context.Response.Write("{'url':'" + jsonObj["url"].ToString() + "','title':'" + filename + "','state':'" + state + "'}");
                        }
                    }
                    else
                    {
                        context.Response.Write("<script>alert('上传文件不能大于2M！')</script>");
                    }
                }
                else
                {
                    context.Response.Write("<script>alert('只支持GIF、JPG、PNG格式的图片！')</script>");
                }

            }

           
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
        /// <summary> 
        /// Http上传文件 
        /// </summary> 
        public static string HttpUploadFile(string url, string path)
        {
            // 设置参数 
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            request.Method = "POST";
            string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线 
            request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;
            byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("
--" + boundary + "
");
            byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("
--" + boundary + "--
");

            int pos = path.LastIndexOf("\");
            string fileName = path.Substring(pos + 1);

            //请求头部信息  
            StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name="media";filename="{0}"
Content-Type:application/octet-stream

", fileName));
            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());

            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
            byte[] bArr = new byte[fs.Length];
            fs.Read(bArr, 0, bArr.Length);
            fs.Close();

            Stream postStream = request.GetRequestStream();
            postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
            postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
            postStream.Write(bArr, 0, bArr.Length);
            postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
            postStream.Close();

            //发送请求并获取相应回应数据 
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            //直到request.GetResponse()程序才开始向目标网页发送Post请求 
            Stream instream = response.GetResponseStream();
            StreamReader sr = new StreamReader(instream, Encoding.UTF8);
            //返回结果网页（html）代码 
            string content = sr.ReadToEnd();
            return content;
        }
    }