具体在哪看见的忘记了。
异步：
public static class CallWebAPI { public static async Task<string> APIPost(string url, string data) { string result = string.Empty; //设置HttpClientHandler的AutomaticDecompression var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip }; //创建HttpClient（注意传入HttpClientHandler） using (var http = new HttpClient(handler)) { //使用FormUrlEncodedContent做HttpContent var content = new FormUrlEncodedContent(new Dictionary<string, string>() { //传递单个值 {"", data}//键名必须为空 //传递对象 //{"name","hello"}, //{"age","16"} }); //await异步等待回应 var response = await http.PostAsync(url, content); //确保HTTP成功状态值 response.EnsureSuccessStatusCode(); //await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip） result = await response.Content.ReadAsStringAsync(); } return result; } static async void APIGet(string url) { //创建HttpClient（注意传入HttpClientHandler） var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip }; using (var http = new HttpClient(handler)) { //await异步等待回应 var response = await http.GetAsync(url); //确保HTTP成功状态值 response.EnsureSuccessStatusCode(); //await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip） Console.WriteLine(await response.Content.ReadAsStringAsync()); } } }
同步：
public static class RequestUtility { #region 同步方法 /// <summary> /// 使用Get方法获取字符串结果（没有加入Cookie） /// </summary> /// <param name="url"></param> /// <returns></returns> public static string HttpGet(string url, Encoding encoding = null) { WebClient wc = new WebClient(); wc.Encoding = encoding ?? Encoding.UTF8; //if (encoding != null) //{ // wc.Encoding = encoding; //} return wc.DownloadString(url); } /// <summary> /// 使用Get方法获取字符串结果（加入Cookie） /// </summary> /// <param name="url"></param> /// <param name="cookieContainer"></param> /// <param name="encoding"></param> /// <returns></returns> public static string HttpGet(string url, CookieContainer cookieContainer = null, Encoding encoding = null, int timeOut = 10000) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Method = "GET"; request.Timeout = timeOut; if (cookieContainer != null) { request.CookieContainer = cookieContainer; } 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.GetEncoding("utf-8"))) { string retString = myStreamReader.ReadToEnd(); return retString; } } } /// <summary> /// 使用Post方法获取字符串结果，常规提交 /// </summary> /// <returns></returns> public static string HttpPost(string url, CookieContainer cookieContainer = null, Dictionary<string, string> formData = null, Encoding encoding = null, int timeOut = 10000) { MemoryStream ms = new MemoryStream(); formData.FillFormDataStream(ms);//填充formData return HttpPost(url, cookieContainer, ms, null, null, encoding, timeOut); } /// <summary> /// 使用Post方法获取字符串结果 /// </summary> /// <param name="url"></param> /// <param name="cookieContainer"></param> /// <param name="postStream"></param> /// <param name="fileDictionary">需要上传的文件，Key：对应要上传的Name，Value：本地文件名</param> /// <param name="timeOut"></param> /// <returns></returns> public static string HttpPost(string url, CookieContainer cookieContainer = null, Stream postStream = null, Dictionary<string, string> fileDictionary = null, string refererUrl = null, Encoding encoding = null, int timeOut = 10000) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Method = "POST"; request.Timeout = timeOut; #region 处理Form表单文件上传 var formUploadFile = fileDictionary != null && fileDictionary.Count > 0;//是否用Form上传文件 if (formUploadFile) { //通过表单上传文件 postStream = postStream ?? new MemoryStream(); string boundary = "----" + DateTime.Now.Ticks.ToString("x"); //byte[] boundarybytes = Encoding.ASCII.GetBytes(" --" + boundary + " "); string fileFormdataTemplate = " --" + boundary + " Content-Disposition: form-data; name="{0}"; filename="{1}" Content-Type: application/octet-stream "; string dataFormdataTemplate = " --" + boundary + " Content-Disposition: form-data; name="{0}" {1}"; foreach (var file in fileDictionary) { try { var fileName = file.Value; //准备文件流 using (var fileStream = FileHelper.GetFileStream(fileName)) { string formdata = null; if (fileStream != null) { //存在文件 formdata = string.Format(fileFormdataTemplate, file.Key, /*fileName*/ Path.GetFileName(fileName)); } else { //不存在文件或只是注释 formdata = string.Format(dataFormdataTemplate, file.Key, file.Value); } //统一处理 var formdataBytes = Encoding.ASCII.GetBytes(postStream.Length == 0 ? formdata.Substring(2, formdata.Length - 2) : formdata);//第一行不需要换行 postStream.Write(formdataBytes, 0, formdataBytes.Length); //写入文件 if (fileStream != null) { byte[] buffer = new byte[1024]; int bytesRead = 0; while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0) { postStream.Write(buffer, 0, bytesRead); } } } } catch (Exception ex) { throw ex; } } //结尾 var footer = Encoding.ASCII.GetBytes(" --" + boundary + "-- "); postStream.Write(footer, 0, footer.Length); request.ContentType = string.Format("multipart/form-data; boundary={0}", boundary); } else { request.ContentType = "application/x-www-form-urlencoded"; } #endregion request.ContentLength = postStream != null ? postStream.Length : 0; request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8"; request.KeepAlive = true; if (!string.IsNullOrEmpty(refererUrl)) { request.Referer = refererUrl; } 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 (cookieContainer != null) { request.CookieContainer = cookieContainer; } #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.GetEncoding("utf-8"))) { string retString = myStreamReader.ReadToEnd(); return retString; } } } #endregion /// <summary> /// 组装QueryString的方法 /// 参数之间用&连接，首位没有符号，如：a=1&b=2&c=3 /// </summary> /// <param name="formData"></param> /// <returns></returns> public static string GetQueryString(this Dictionary<string, string> formData) { if (formData == null || formData.Count == 0) { return ""; } StringBuilder sb = new StringBuilder(); var i = 0; foreach (var kv in formData) { i++; sb.AppendFormat("{0}={1}", kv.Key, kv.Value); if (i < formData.Count) { sb.Append("&"); } } return sb.ToString(); } /// <summary> /// 填充表单信息的Stream /// </summary> /// <param name="formData"></param> /// <param name="stream"></param> public static void FillFormDataStream(this Dictionary<string, string> formData, Stream stream) { string dataString = GetQueryString(formData); var formDataBytes = formData == null ? new byte[0] : Encoding.UTF8.GetBytes(dataString); stream.Write(formDataBytes, 0, formDataBytes.Length); stream.Seek(0, SeekOrigin.Begin);//设置指针读取位置 } /// <summary> /// 封装System.Web.HttpUtility.HtmlEncode /// </summary> /// <param name="html"></param> /// <returns></returns> public static string HtmlEncode(this string html) { return System.Web.HttpUtility.HtmlEncode(html); } /// <summary> /// 封装System.Web.HttpUtility.HtmlDecode /// </summary> /// <param name="html"></param> /// <returns></returns> public static string HtmlDecode(this string html) { return System.Web.HttpUtility.HtmlDecode(html); } /// <summary> /// 封装System.Web.HttpUtility.UrlEncode /// </summary> /// <param name="url"></param> /// <returns></returns> public static string UrlEncode(this string url) { return System.Web.HttpUtility.UrlEncode(url); } /// <summary> /// 封装System.Web.HttpUtility.UrlDecode /// </summary> /// <param name="url"></param> /// <returns></returns> public static string UrlDecode(this string url) { return System.Web.HttpUtility.UrlDecode(url); } }
FileHelper.cs
public class FileHelper { /// <summary> /// 根据完整文件路径获取FileStream /// </summary> /// <param name="fileName"></param> /// <returns></returns> public static FileStream GetFileStream(string fileName) { FileStream fileStream = null; if (!string.IsNullOrEmpty(fileName) && File.Exists(fileName)) { fileStream = new FileStream(fileName, FileMode.Open); } return fileStream; } }
下面这个也可以试试。
/// <summary> /// Post获取信息 /// </summary> /// <typeparam name="T">实体对象</typeparam> /// <param name="url">post url</param> /// <param name="data">post json data</param> /// <returns></returns> public static T PostOfUrl<T>(string url, string data) { System.Net.HttpWebRequest httpWebRequest = (HttpWebRequest)System.Net.WebRequest.Create(url); httpWebRequest.Method = "POST"; httpWebRequest.Headers.Add("Accept-Charset", "utf-8"); byte[] postBytes = Encoding.UTF8.GetBytes(data); //httpWebRequest.ContentType = "text/xml"; httpWebRequest.ContentType = "application/json; charset=utf-8";// httpWebRequest.ContentLength = Encoding.UTF8.GetByteCount(data);//strJson为json字符串 Stream stream = httpWebRequest.GetRequestStream(); stream.Write(postBytes, 0, postBytes.Length); stream.Close();//发送完毕，接受返回值 var response = httpWebRequest.GetResponse(); Stream streamResponse = response.GetResponseStream(); StreamReader streamRead = new StreamReader(streamResponse); String responseString = streamRead.ReadToEnd(); JavaScriptSerializer js = new JavaScriptSerializer(); var list = js.Deserialize<T>(responseString); return list; } public static T GetOfUrl<T>(string url) { HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url); req.Method = "GET"; HttpWebResponse resp = (HttpWebResponse)req.GetResponse(); StreamReader sr = new StreamReader(resp.GetResponseStream(), Encoding.UTF8); string respHtml = sr.ReadToEnd(); JavaScriptSerializer js = new JavaScriptSerializer(); var list = js.Deserialize<T>(respHtml); return list; }