C# post请求 HttpWebRequest C#通过HttpWebRequest发送带有JSON Body的POST请求实现
NeverSettle101 人气:0想了解C#通过HttpWebRequest发送带有JSON Body的POST请求实现的相关内容吗,NeverSettle101在本文为您仔细讲解C# post请求 HttpWebRequest的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:C#,post请求,HttpWebRequest,C#,HttpWebRequest,JSON,post,下面大家一起来学习吧。
起因
很多博客都有描述到这个问题,那么为什么我还要写一篇文章来说一下呢,因为其他的都似乎已经过时了,会导致其实body 并没有发送过去。至于为什么不使用其他的诸如 HttpClient 之类的,是由于业务需要。
原来的处理方式
通过 GetRequestStream 来获取请求流,后把需要发送的 Json 数据写入到流中
private T PostDataViaHttpWebRequest<T>(string baseUrl, IReadOnlyDictionary<string, string> headers, IReadOnlyDictionary<string, string> urlParas, string requestBody=null) { var resuleJson = string.Empty; try { var apiUrl = baseUrl; if (urlParas != null) urlParas.ForEach(p => { if (apiUrl.IndexOf("{" + p.Key + "}") > -1) { apiUrl = apiUrl.Replace("{" + p.Key + "}", p.Value); } else { apiUrl += string.Format("{0}{1}={2}", apiUrl.Contains("?") ? "&" : "?", p.Key, p.Value); } } ); var req = (HttpWebRequest)WebRequest.Create(apiUrl); req.Method = "POST"; req.ContentType = "application/json"; req.ContentLength = 0; if (!requestBody.IsNullOrEmpty()) { using (var postStream = req.GetRequestStream()) { var postData = Encoding.ASCII.GetBytes(requestBody); req.ContentLength = postData.Length; postStream.Write(postData, 0, postData.Length); } } if (headers != null) { if (headers.Keys.Any(p => p.ToLower() == "content-type")) req.ContentType = headers.SingleOrDefault(p => p.Key.ToLower() == "content-type").Value; if (headers.Keys.Any(p => p.ToLower() == "accept")) req.Accept = headers.SingleOrDefault(p => p.Key.ToLower() == "accept").Value; } var response = (HttpWebResponse)req.GetResponse(); using(Stream stream = response.GetResponseStream()) { using (StreamReader reader = new StreamReader(stream, Encoding.GetEncoding("UTF-8"))) { resuleJson = reader.ReadToEnd(); } } } catch (Exception ex) { return default(T); } return JsonConvert.DeserializeObject<T>(resuleJson); }
但是会发现,数据一直没有正常发送过去,而且代码还显得比较复杂
新的方式
这里修改一下写入 RequestStream 的方式,使用 StreamWriter 包装一下,然后直接写入需要发送的 Json 数据
private T PostDataViaHttpWebRequest<T>(string baseUrl, IReadOnlyDictionary<string, string> headers, IReadOnlyDictionary<string, string> urlParas, string requestBody=null) { var resuleJson = string.Empty; try { var apiUrl = baseUrl; if (urlParas != null) urlParas.ForEach(p => { if (apiUrl.IndexOf("{" + p.Key + "}") > -1) { apiUrl = apiUrl.Replace("{" + p.Key + "}", p.Value); } else { apiUrl += string.Format("{0}{1}={2}", apiUrl.Contains("?") ? "&" : "?", p.Key, p.Value); } } ); var req = (HttpWebRequest)WebRequest.Create(apiUrl); req.Method = "POST"; req.ContentType = "application/json"; //Defalt if (!requestBody.IsNullOrEmpty()) { using (var postStream = new StreamWriter(req.GetRequestStream())) { postStream.Write(requestBody); } } if (headers != null) { if (headers.Keys.Any(p => p.ToLower() == "content-type")) req.ContentType = headers.SingleOrDefault(p => p.Key.ToLower() == "content-type").Value; if (headers.Keys.Any(p => p.ToLower() == "accept")) req.Accept = headers.SingleOrDefault(p => p.Key.ToLower() == "accept").Value; } var response = (HttpWebResponse)req.GetResponse(); using(Stream stream = response.GetResponseStream()) { using (StreamReader reader = new StreamReader(stream, Encoding.GetEncoding("UTF-8"))) { resuleJson = reader.ReadToEnd(); } } } catch (Exception ex) { return default(T); } return JsonConvert.DeserializeObject<T>(resuleJson); }
这样即可正确发送 Json 数据。
加载全部内容