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/// <summary> /// 使用Post方法获取字符串结果 /// </summary> /// <param name="url"></param> /// <param name="formItems">Post表单内容</param> /// <param name="cookieContainer"></param> /// <param name="timeOut">默认20秒</param> /// <param name="encoding">响应内容的编码类型（默认utf-8）</param> /// <returns></returns> public static ResultData PostForm(string url, List<FormItemModel> formItems, CookieContainer cookieContainer = null, string refererUrl = null, Encoding encoding = null, int timeOut = 20000) { //try //{ HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); #region 初始化请求对象 request.Method = "POST"; request.Timeout = timeOut; request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8"; request.KeepAlive = true; request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36"; if (!string.IsNullOrEmpty(refererUrl)) request.Referer = refererUrl; if (cookieContainer != null) request.CookieContainer = cookieContainer; #endregion string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");//分隔符 request.ContentType = string.Format("multipart/form-data; boundary={0}", boundary); //请求流 var postStream = new MemoryStream(); #region 处理Form表单请求内容 //是否用Form上传文件 var formUploadFile = formItems != null && formItems.Count > 0; if (formUploadFile) { //文件数据模板 string fileFormdataTemplate = "--" + boundary + " Content-Disposition: form-data; name="{0}"; filename="{1}"" + " Content-Type: "{2}"" + " "; //图片数据模板 string picFormdataTemplate = "--" + boundary + " Content-Disposition: form-data; name="{0}";filename="{1}" Content-Type:"{2}" "; //文本数据模板 string dataFormdataTemplate = "--" + boundary + " Content-Disposition: form-data; name="{0}" {1} "; foreach (var item in formItems) { string formdata = null; switch (item.formItemType) { case FormitemTypeEnum.文件: //上传文件 formdata = string.Format( fileFormdataTemplate, item.Key, //表单键 item.FileName, item.Value); break; case FormitemTypeEnum.图片: //上传图片 formdata = string.Format( picFormdataTemplate, item.Key, //表单键 item.FileName, item.Value); break; case FormitemTypeEnum.文本: default: //上传文本 formdata = string.Format( dataFormdataTemplate, item.Key, item.Value); break; } //统一处理 byte[] formdataBytes = null; //第一行不需要换行 //if (postStream.Length == 0) // formdataBytes = Encoding.UTF8.GetBytes(formdata.Substring(2, formdata.Length - 2)); //else formdataBytes = Encoding.UTF8.GetBytes(formdata); postStream.Write(formdataBytes, 0, formdataBytes.Length); //写入文件内容 if (item.FileContent != null && item.FileContent.Length > 0) { using (var stream = item.FileContent) { byte[] buffer = new byte[1024]; int bytesRead = 0; while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) != 0) { postStream.Write(buffer, 0, bytesRead); } } byte[] imgbyteend = Encoding.UTF8.GetBytes(" "); postStream.Write(imgbyteend, 0, imgbyteend.Length); } } //结尾 var footer = Encoding.UTF8.GetBytes(" --" + boundary + "-- "); postStream.Write(footer, 0, footer.Length); } else { request.ContentType = "application/x-www-form-urlencoded"; } #endregion request.ContentLength = postStream.Length; #region 输入二进制流 if (postStream != null) { postStream.Position = 0; //直接写入流 Stream requestStream = request.GetRequestStream(); byte[] buffer = new byte[1024]; int bytesRead = 0; while ((bytesRead = postStream.Read(buffer, 0, buffer.Length)) != 0) { requestStream.Write(buffer, 0, bytesRead); } ////debug //postStream.Seek(0, SeekOrigin.Begin); //StreamReader sr = new StreamReader(postStream); //var postStr = sr.ReadToEnd(); postStream.Close();//关闭文件访问 } #endregion HttpWebResponse response = (HttpWebResponse)request.GetResponse(); if (cookieContainer != null) { response.Cookies = cookieContainer.GetCookies(response.ResponseUri); } using (Stream responseStream = response.GetResponseStream()) { using (StreamReader myStreamReader = new StreamReader(responseStream, encoding ?? Encoding.UTF8)) { string retString = myStreamReader.ReadToEnd(); ZY_MicronewsResult mresult = JsonConvert.DeserializeObject<ZY_MicronewsResult>(retString); if (!string.IsNullOrEmpty(mresult.response)) { return ResultData.Access(); } else { return ResultData.Fail(mresult.error); } } } //} //catch (Exception ex) //{ // return ResultData.Fail(ex.Message); //} }
//实体类
/// <summary> /// 表单数据项 /// </summary> public class FormItemModel { public FormitemTypeEnum formItemType { get; set; } = FormitemTypeEnum.文本; /// <summary> /// 表单键，request["key"] /// </summary> public string Key { set; get; } /// <summary> /// 表单值,上传文件时忽略，request["key"].value /// 格式：application/octet-stream /// </summary> public string Value { set; get; } public byte[] pic_bytes { get; set; } /// <summary> /// 是否是文件 /// </summary> public bool IsFile { get { if (FileContent == null || FileContent.Length == 0) return false; if (FileContent != null && FileContent.Length > 0 && string.IsNullOrWhiteSpace(FileName)) throw new Exception("上传文件时 FileName 属性值不能为空"); return true; } } /// <summary> /// 上传的文件名 /// </summary> public string FileName { set; get; } /// <summary> /// 上传的文件内容 /// </summary> public Stream FileContent { set; get; } /// <summary> /// 获取上传文件Model /// </summary> /// <param name="key">名称</param> /// <param name="value">内容</param> /// <returns></returns> public static FormItemModel GetTextModel(string key, string value) { var model = new Model.Common.FormItemModel { Key = key, Value = value, formItemType = Model.Common.FormitemTypeEnum.文本 }; return model; } /// <summary> /// 获取上传文件Model /// </summary> /// <param name="url">url路径</param> /// <returns></returns> public static FormItemModel GetFileModel(string url) { Uri uri = null; try { uri = new Uri(url); } catch { return null; } var bit = Model.Common.DownloadImg(uri.AbsoluteUri); System.IO.MemoryStream memo = new System.IO.MemoryStream(); bit.Save(memo, System.Drawing.Imaging.ImageFormat.Jpeg); memo.Position = 0; var model = new Model.Common.FormItemModel { Key = "file", Value = "application/octet-stream", FileName = Path.GetFileName(uri.AbsoluteUri), formItemType = Model.Common.FormitemTypeEnum.文件, FileContent = memo }; return model; } /// <summary> /// 获取上传图片Model /// </summary> /// <param name="url">url路径</param> /// <returns></returns> public static FormItemModel GetImgModel(string key, string url) { Uri uri = null; try { uri = new Uri(url); } catch { return null; } var bit = Model.Common.DownloadImg(uri.AbsoluteUri); System.IO.MemoryStream memo = new System.IO.MemoryStream(); bit.Save(memo, System.Drawing.Imaging.ImageFormat.Jpeg); memo.Position = 0; var model = new Model.Common.FormItemModel { Key = key, Value = "application/octet-stream", FileName = Path.GetFileName(uri.AbsoluteUri), formItemType = Model.Common.FormitemTypeEnum.图片, FileContent = memo }; return model; } /// <summary> /// 获取上传图片Model /// </summary> /// <param name="key">名称</param> /// <param name="fileName">文件名</param> /// <param name="stream">文件流</param> /// <returns></returns> public static FormItemModel GetImgModel(string key, string fileName, Stream stream) { stream.Position = 0; var model = new Model.Common.FormItemModel { Key = key, Value = "application/octet-stream", FileName = fileName, formItemType = Model.Common.FormitemTypeEnum.图片, FileContent = stream }; return model; } } /// <summary> /// Form上传类型 /// </summary> public enum FormitemTypeEnum { 文本 = 0, 文件 = 1, 图片 = 2 }
调用实例
string url = "http://xxxxx.com"; List<Model.Common.FormItemModel> formItems = new List<Model.Common.FormItemModel>(); formItems.Add(Model.Common.FormItemModel.GetTextModel("visible", "-1")); //文本参数 var imgs = model_MicroNews.MicroNews_imgurl.ToList(); for (int i = 0; i < imgs.Count; i++) { var img = imgs[i]; formItems.Add(Model.Common.FormItemModel.GetImgModel("pic_" + (i + 1), "pic_" + (i + 1) + ".jpeg", img.stream)); //图片 } var result = Model.Common.PostForm(url, formItems);