利用HttpWebRequest模拟表单提交-白红宇

利用HttpWebRequest模拟表单提交

阅读量：5130 次

发布时间：2019-06-13

本文共 4920 字，大约阅读时间需要 16 分钟。

1 using System;  2 using System.Collections.Specialized;  3 using System.IO;  4 using System.Net;  5 using System.Text;  6   7 namespace Allyn.Common  8 {  9     public class HttpHelper 10     { 11         ///  12         /// 获取指定路径数据 13         /// 
 14         /// 提交路径 15         /// Cookie容器对象 16         /// 
     
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      17         public static string GetForm(string requestUri, CookieContainer cookie) 18         { 19             HttpWebRequest request = WebRequest.CreateHttp(requestUri); 20             request.Method = "get"; 21             request.CookieContainer = cookie; 22             request.ContentLength = 0; 23  24             WebResponse response = request.GetResponse(); 25             StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8); 26             return reader.ReadToEnd(); 27         } 28  29         ///  30         /// 默认表单提交 31         /// 
 32         /// 提交路径 33         /// 提交数据 34         /// Cookie容器对象 35         /// 
     
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      36         public static string PostForm(string requestUri, NameValueCollection postData, CookieContainer cookie) 37         { 38             HttpWebRequest request = WebRequest.CreateHttp(requestUri); 39             request.Method = "post"; 40             request.ContentType = "application/x-www-form-urlencoded"; 41             request.CookieContainer = cookie; 42  43             StringBuilder stringBuilder = new StringBuilder(); 44             foreach (string key in postData.Keys) 45             { 46                 stringBuilder.AppendFormat("&{0}={1}", key, postData.Get(key)); 47             } 48             byte[] buffer = Encoding.UTF8.GetBytes(stringBuilder.ToString().Trim('&')); 49             Stream requestStream = request.GetRequestStream(); 50             requestStream.Write(buffer, 0, buffer.Length); 51             requestStream.Close(); 52  53             WebResponse response = request.GetResponse(); 54             StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8); 55             return reader.ReadToEnd(); 56         } 57  58         ///  59         /// 多部件表单提交 60         /// 
 61         /// 提交路径 62         /// 提交数据.注:如果是文件路径,代表是文件. 63         /// Cookie容器对象 64         /// 
     
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      65         public static string PostFormMultipart(string requestUri, NameValueCollection postData, CookieContainer cookie) 66         { 67             string boundary = string.Format("-----{0}", DateTime.Now.Ticks.ToString("x")); 68             HttpWebRequest webrequest = WebRequest.CreateHttp(requestUri); 69             webrequest.CookieContainer = cookie; 70             webrequest.Timeout = 120000; 71             webrequest.Method = "post"; 72             webrequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary); 73  74             Stream requestStream = webrequest.GetRequestStream(); 75             foreach (string key in postData.Keys) 76             { 77                 StringBuilder strBuilder = new StringBuilder(); 78                 strBuilder.AppendFormat("--{0}", boundary); 79                 strBuilder.AppendFormat("\r\nContent-Disposition: form-data; name=\"{0}\"", key); 80                 if (File.Exists(postData.Get(key))) 81                 { 82                     strBuilder.AppendFormat(";filename=\"{0}\"\r\nContent-Type: multipart/form-data\r\n\r\n", Path.GetFileName(postData.Get(key))); 83                     byte[] buffer = Encoding.UTF8.GetBytes(strBuilder.ToString()); 84                     requestStream.Write(buffer, 0, buffer.Length); 85                     //获取图片流 86                     FileStream fileStream = new FileStream(postData.Get(key), FileMode.Open, FileAccess.Read); 87                     BinaryReader binaryReader = new BinaryReader(fileStream); 88                     byte[] fileBuffer = binaryReader.ReadBytes((int)fileStream.Length); 89                     binaryReader.Close(); 90                     fileStream.Close(); 91                     requestStream.Write(fileBuffer, 0, fileBuffer.Length); 92                 } 93                 else 94                 { 95                     strBuilder.AppendFormat("\r\n\r\n{0}\r\n", postData.Get(key)); 96                     byte[] buff = Encoding.UTF8.GetBytes(strBuilder.ToString()); 97                     requestStream.Write(buff, 0, buff.Length); 98                 } 99             }100 101             byte[] boundaryBuffer = Encoding.UTF8.GetBytes(string.Format("\r\n--{0}\r\n", boundary));102             requestStream.Write(boundaryBuffer, 0, boundaryBuffer.Length);103             requestStream.Close();104 105             WebResponse response = webrequest.GetResponse();106             StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);107             return reader.ReadToEnd();108         }109     }110 }