使用C＃console应用程序创建HTTP post请求并接收响应

我需要根据我发布的参数将数据发布到URL（https://somesite.com）以在responseStrem中下载文件。 如何使用C＃控制台应用程序执行此操作？

参数：filename，userid，password，type

Answer 1

看一下System.Net.WebClient类，它可以用来发出请求并处理它们的响应，以及下载文件：

http://www.hanselman.com/blog/HTTPPOSTsAndHTTPGETsWithWebClientAndCAndFakingAPostBack.aspx

http://msdn.microsoft.com/en-us/library/system.net.webclient(VS.90).aspx

Answer 2

 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net; using System.IO; namespace WebserverInteractionClassLibrary { public class RequestManager { public string LastResponse { protected set; get; } CookieContainer cookies = new CookieContainer(); internal string GetCookieValue(Uri SiteUri,string name) { Cookie cookie = cookies.GetCookies(SiteUri)[name]; return (cookie == null) ? null : cookie.Value; } public string GetResponseContent(HttpWebResponse response) { if (response == null) { throw new ArgumentNullException("response"); } Stream dataStream = null; StreamReader reader = null; string responseFromServer = null; try { // Get the stream containing content returned by the server. dataStream = response.GetResponseStream(); // Open the stream using a StreamReader for easy access. reader = new StreamReader(dataStream); // Read the content. responseFromServer = reader.ReadToEnd(); // Cleanup the streams and the response. } catch (Exception ex) { Console.WriteLine(ex.Message); } finally { if (reader != null) { reader.Close(); } if (dataStream != null) { dataStream.Close(); } response.Close(); } LastResponse = responseFromServer; return responseFromServer; } public HttpWebResponse SendPOSTRequest(string uri, string content, string login, string password, bool allowAutoRedirect) { HttpWebRequest request = GeneratePOSTRequest(uri, content, login, password, allowAutoRedirect); return GetResponse(request); } public HttpWebResponse SendGETRequest(string uri, string login, string password, bool allowAutoRedirect) { HttpWebRequest request = GenerateGETRequest(uri, login, password, allowAutoRedirect); return GetResponse(request); } public HttpWebResponse SendRequest(string uri, string content, string method, string login, string password, bool allowAutoRedirect) { HttpWebRequest request = GenerateRequest(uri, content, method, login, password, allowAutoRedirect); return GetResponse(request); } public HttpWebRequest GenerateGETRequest(string uri, string login, string password, bool allowAutoRedirect) { return GenerateRequest(uri, null, "GET", null, null, allowAutoRedirect); } public HttpWebRequest GeneratePOSTRequest(string uri, string content, string login, string password, bool allowAutoRedirect) { return GenerateRequest(uri, content, "POST", null, null, allowAutoRedirect); } internal HttpWebRequest GenerateRequest(string uri, string content, string method, string login, string password, bool allowAutoRedirect) { if (uri == null) { throw new ArgumentNullException("uri"); } // Create a request using a URL that can receive a post. HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri); // Set the Method property of the request to POST. request.Method = method; // Set cookie container to maintain cookies request.CookieContainer = cookies; request.AllowAutoRedirect = allowAutoRedirect; // If login is empty use defaul credentials if (string.IsNullOrEmpty(login)) { request.Credentials = CredentialCache.DefaultNetworkCredentials; } else { request.Credentials = new NetworkCredential(login, password); } if (method == "POST") { // Convert POST data to a byte array. byte[] byteArray = Encoding.UTF8.GetBytes(content); // Set the ContentType property of the WebRequest. request.ContentType = "application/x-www-form-urlencoded"; // Set the ContentLength property of the WebRequest. request.ContentLength = byteArray.Length; // Get the request stream. Stream dataStream = request.GetRequestStream(); // Write the data to the request stream. dataStream.Write(byteArray, 0, byteArray.Length); // Close the Stream object. dataStream.Close(); } return request; } internal HttpWebResponse GetResponse(HttpWebRequest request) { if (request == null) { throw new ArgumentNullException("request"); } HttpWebResponse response = null; try { response = (HttpWebResponse)request.GetResponse(); cookies.Add(response.Cookies); // Print the properties of each cookie. Console.WriteLine("\nCookies: "); foreach (Cookie cook in cookies.GetCookies(request.RequestUri)) { Console.WriteLine("Domain: {0}, String: {1}", cook.Domain, cook.ToString()); } } catch (WebException ex) { Console.WriteLine("Web exception occurred. Status code: {0}", ex.Status); } catch (Exception ex) { Console.WriteLine(ex.Message); } return response; } } } 

Answer 3

为此，您可以简单地使用.net中的“HttpWebRequest”和“HttpWebResponse”类。

下面是我编写的示例控制台应用程序，用于演示这是多么容易。

 using System; using System.Collections.Generic; using System.Text; using System.Net; using System.IO; namespace Test { class Program { static void Main(string[] args) { string url = "www.somewhere.com"; string fileName = @"C:\output.file"; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Timeout = 5000; try { using (WebResponse response = (HttpWebResponse)request.GetResponse()) { using (FileStream stream = new FileStream(fileName, FileMode.Create, FileAccess.Write)) { byte[] bytes = ReadFully(response.GetResponseStream()); stream.Write(bytes, 0, bytes.Length); } } } catch (WebException) { Console.WriteLine("Error Occured"); } } public static byte[] ReadFully(Stream input) { byte[] buffer = new byte[16 * 1024]; using (MemoryStream ms = new MemoryStream()) { int read; while ((read = input.Read(buffer, 0, buffer.Length)) > 0) { ms.Write(buffer, 0, read); } return ms.ToArray(); } } } } 

请享用！

Answer 4

 HttpWebRequest request =(HttpWebRequest)WebRequest.Create("some url"); request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; request.UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 7.1; Trident/5.0)"; request.Accept = "/"; request.UseDefaultCredentials = true; request.Proxy.Credentials = System.Net.CredentialCache.DefaultCredentials; doc.Save(request.GetRequestStream()); HttpWebResponse resp = request.GetResponse() as HttpWebResponse; 

希望能帮助到你