| 标题 | Asp.Net模拟表单提交数据和上传文件的实现代码 |
| 内容 | 如果你需要跨域上传内容到另外一个域名并且需要获取返回值，使用Asp.Net的作为代理是最好的办法，要是客户端直接提交到iframe中，由于跨域是无法用javascript获取到iframe中返回的内容的。此时需要在自己的网站做一个动态页作为代理，将表单提交到动态页，动态页负责将表单的内容使用WebClient或HttpWebRequest将表单数据再上传到远程服务器，由于在服务器端进行操作，就不存在跨域问题了。 WebClient上传只包含键值对的文本信息示例代码： 代码如下: string uriString = "http://localhost/login.aspx"; // 创建一个新的 WebClient 实例. WebClient myWebClient = new WebClient(); string postData = "Username=admin&Password=admin"; // 注意这种拼字符串的ContentType myWebClient.Headers.Add("Content-Type","application/x-www-form-urlencoded"); // 转化成二进制数组 byte[] byteArray = Encoding.ASCII.GetBytes(postData); // 上传数据，并获取返回的二进制数据. byte[] responseArray = myWebClient.UploadData(uriString,"POST",byteArray); WebClient上传只包含文件的示例代码： 代码如下: String uriString = "http://localhost/uploadFile.aspx"; // 创建一个新的 WebClient 实例. WebClient myWebClient = new WebClient(); string fileName = @"C:/upload.txt"; // 直接上传，并获取返回的二进制数据. byte[] responseArray = myWebClient.UploadFile(uriString,"POST",fileName); 对于既包含文件又包含文本键值对信息的示例代码，需要构造表单提交的内容，对于学asp的同学来说，下面的表单提交内容一定不会陌生 代码如下: -----------------------------7d429871607fe Content-Disposition: form-data; name="file1"; filename="G:/homepage.txt" Content-Type: text/plain 易贤网：http://www.ynpxrz.com -----------------------------7d429871607fe Content-Disposition: form-data; name="filename" default filename -----------------------------7d429871607fe-- 所以只要拼一个这样的byte[] data数据Post过去，就可以达到同样的效果了。但是一定要注意，对于这种带有文件上传的，其ContentType是不一样的，例如上面的这种，其ContentType为"multipart/form-data; boundary=---------------------------7d429871607fe"。有了ContentType，我们就可以知道boundary(就是上面的"---------------------------7d429871607fe")，知道boundary了我们就可以构造出我们所需要的byte[] data了，最后，不要忘记，把我们构造的ContentType传到WebClient中（例如:webClient.Headers.Add("Content-Type", ContentType);）这样，就可以通过WebClient.UploadData 方法上载文件数据了。 001 using System; 002 using System.Web; 003 using System.IO; 004 using System.Net; 005 using System.Text; 006 using System.Collections; 007 namespace UploadData.Common 008 { 009 public class CreateBytes 010 { 011 Encoding encoding = Encoding.UTF8; 012 public byte[] JoinBytes(ArrayList byteArrays) 013 { 014 int length = 0; 015 int readLength = 0; 016 // 加上结束边界 017 string endBoundary = Boundary + "-- "; 018 byte[] endBoundaryBytes = encoding.GetBytes(endBoundary); 019 byteArrays.Add(endBoundaryBytes); 020 foreach (byte[] b in byteArrays) 021 { 022 length += b.Length; 023 } 024 byte[] bytes = new byte[length]; 025 // 遍历复制 026 foreach (byte[] b in byteArrays) 027 { 028 b.CopyTo(bytes, readLength); 029 readLength += b.Length; 030 } 031 return bytes; 032 } 033 public bool UploadData(string uploadUrl, byte[] bytes, out byte[] responseBytes) 034 { 035 WebClient webClient = new WebClient(); 036 webClient.Headers.Add("Content-Type", ContentType); 037 try 038 { 039 responseBytes = webClient.UploadData(uploadUrl, bytes); 040 return true; 041 } 042 catch (WebException ex) 043 { 044 Stream resp = ex.Response.GetResponseStream(); 045 responseBytes = new byte[ex.Response.ContentLength]; 046 resp.Read(responseBytes, 0, responseBytes.Length); 047 } 048 return false; 049 } 050 /// 获取普通表单区域二进制数组 051 public byte[] CreateFieldData(string fieldName, string fieldValue) 052 { 053 string textTemplate = Boundary + " Content-Disposition: form-data; name="{0}" {1} "; 054 string text = String.Format(textTemplate, fieldName, fieldValue); 055 byte[] bytes = encoding.GetBytes(text); 056 return bytes; 057 } 058 public byte[] CreateFieldData(string fieldName, string filename, string contentType, byte[] fileBytes) 059 { 060 string end = " "; 061 string textTemplate = Boundary + " Content-Disposition: form-data; name="{0}"; filename="{1}" Content-Type: {2} "; 062 // 头数据 063 string data = String.Format(textTemplate, fieldName, filename, contentType); 064 byte[] bytes = encoding.GetBytes(data); 065 // 尾数据 066 byte[] endBytes = encoding.GetBytes(end); 067 // 合成后的数组 068 byte[] fieldData = new byte[bytes.Length + fileBytes.Length + endBytes.Length]; 069 bytes.CopyTo(fieldData, 0); // 头数据 070 fileBytes.CopyTo(fieldData, bytes.Length); // 文件的二进制数据 071 endBytes.CopyTo(fieldData, bytes.Length + fileBytes.Length); // 072 return fieldData; 073 } 074 public string Boundary 075 { 076 get 077 { 078 string[] bArray, ctArray; 079 string contentType = ContentType; 080 ctArray = contentType.Split(';'); 081 if (ctArray[0].Trim().ToLower() == "multipart/form-data") 082 { 083 bArray = ctArray[1].Split('='); 084 return "--" + bArray[1]; 085 } 086 return null; 087 } 088 } 089 public string ContentType 090 { 091 get 092 { 093 if (HttpContext.Current == null) 094 { 095 return "multipart/form-data; boundary=---------------------------7d5b915500cee"; 096 } 097 return HttpContext.Current.Request.ContentType; 098 } 099 } 100 } 101 } 102 using System; 103 using System.Drawing; 104 using System.Collections; 105 using System.ComponentModel; 106 using System.Windows.Forms; 107 using System.Data; 108 using UploadData.Common; 109 using System.IO; 110 namespace UploadDataWin 111 { 112 public class frmUpload : System.Windows.Forms.Form 113 { 114 private System.Windows.Forms.Label lblAmigoToken; 115 private System.Windows.Forms.TextBox txtAmigoToken; 116 private System.Windows.Forms.Label lblFilename; 117 private System.Windows.Forms.TextBox txtFilename; 118 private System.Windows.Forms.Button btnBrowse; 119 private System.Windows.Forms.TextBox txtFileData; 120 private System.Windows.Forms.Label lblFileData; 121 private System.Windows.Forms.Button btnUpload; 122 private System.Windows.Forms.OpenFileDialog openFileDialog1; 123 private System.Windows.Forms.TextBox txtResponse; 124 private System.ComponentModel.Container components = null; 125 public frmUpload() 126 { 127 InitializeComponent(); 128 } 129 protected override void Dispose(bool disposing) 130 { 131 if (disposing) 132 { 133 if (components != null) 134 { 135 components.Dispose(); 136 } 137 } 138 base.Dispose(disposing); 139 } 140 private void InitializeComponent() 141 { 142 this.lblAmigoToken = new System.Windows.Forms.Label(); 143 this.txtAmigoToken = new System.Windows.Forms.TextBox(); 144 this.lblFilename = new System.Windows.Forms.Label(); 145 this.txtFilename = new System.Windows.Forms.TextBox(); 146 this.btnBrowse = new System.Windows.Forms.Button(); 147 this.txtFileData = new System.Windows.Forms.TextBox(); 148 this.lblFileData = new System.Windows.Forms.Label(); 149 this.btnUpload = new System.Windows.Forms.Button(); 150 this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog(); 151 this.txtResponse = new System.Windows.Forms.TextBox(); 152 this.SuspendLayout(); 153 // 154 // lblAmigoToken 155 // 156 this.lblAmigoToken.Location = new System.Drawing.Point(40, 48); 157 this.lblAmigoToken.Name = "lblAmigoToken"; 158 this.lblAmigoToken.Size = new System.Drawing.Size(72, 23); 159 this.lblAmigoToken.TabIndex = 0; 160 this.lblAmigoToken.Text = "AmigoToken"; 161 // 162 // txtAmigoToken 163 // 164 this.txtAmigoToken.Location = new System.Drawing.Point(120, 48); 165 this.txtAmigoToken.Name = "txtAmigoToken"; 166 this.txtAmigoToken.Size = new System.Drawing.Size(248, 21); 167 this.txtAmigoToken.TabIndex = 1; 168 this.txtAmigoToken.Text = ""; 169 // 170 // lblFilename 171 // 172 this.lblFilename.Location = new System.Drawing.Point(40, 96); 173 this.lblFilename.Name = "lblFilename"; 174 this.lblFilename.Size = new System.Drawing.Size(80, 23); 175 this.lblFilename.TabIndex = 2; 176 this.lblFilename.Text = "Filename"; 177 // 178 // txtFilename 179 // 180 this.txtFilename.Location = new System.Drawing.Point(120, 96); 181 this.txtFilename.Name = "txtFilename"; 182 this.txtFilename.Size = new System.Drawing.Size(248, 21); 183 this.txtFilename.TabIndex = 3; 184 this.txtFilename.Text = ""; 185 // 186 // btnBrowse 187 // 188 this.btnBrowse.Location = new System.Drawing.Point(296, 144); 189 this.btnBrowse.Name = "btnBrowse"; 190 this.btnBrowse.TabIndex = 4; 191 this.btnBrowse.Text = "浏览"; 192 this.btnBrowse.Click += new System.EventHandler(this.btnBrowse_Click); 193 // 194 // txtFileData 195 // 196 this.txtFileData.Location = new System.Drawing.Point(120, 144); 197 this.txtFileData.Name = "txtFileData"; 198 this.txtFileData.Size = new System.Drawing.Size(168, 21); 199 this.txtFileData.TabIndex = 5; 200 this.txtFileData.Text = ""; 201 // 202 // lblFileData 203 // 204 this.lblFileData.Location = new System.Drawing.Point(40, 144); 205 this.lblFileData.Name = "lblFileData"; 206 this.lblFileData.Size = new System.Drawing.Size(72, 23); 207 this.lblFileData.TabIndex = 6; 208 this.lblFileData.Text = "FileData"; 209 // 210 // btnUpload 211 // 212 this.btnUpload.Location = new System.Drawing.Point(48, 184); 213 this.btnUpload.Name = "btnUpload"; 214 this.btnUpload.TabIndex = 7; 215 this.btnUpload.Text = "Upload"; 216 this.btnUpload.Click += new System.EventHandler(this.btnUpload_Click); 217 // 218 // txtResponse 219 // 220 this.txtResponse.Location = new System.Drawing.Point(136, 184); 221 this.txtResponse.Multiline = true; 222 this.txtResponse.Name = "txtResponse"; 223 this.txtResponse.Size = new System.Drawing.Size(248, 72); 224 this.txtResponse.TabIndex = 8; 225 this.txtResponse.Text = ""; 226 // 227 // frmUpload 228 // 229 this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); 230 this.ClientSize = new System.Drawing.Size(400, 269); 231 this.Controls.Add(this.txtResponse); 232 this.Controls.Add(this.btnUpload); 233 this.Controls.Add(this.lblFileData); 234 this.Controls.Add(this.txtFileData); 235 this.Controls.Add(this.btnBrowse); 236 this.Controls.Add(this.txtFilename); 237 this.Controls.Add(this.lblFilename); 238 this.Controls.Add(this.txtAmigoToken); 239 this.Controls.Add(this.lblAmigoToken); 240 this.Name = "frmUpload"; 241 this.Text = "frmUpload"; 242 this.ResumeLayout(false); 243 } 244 [STAThread] 245 static void Main() 246 { 247 Application.Run(new frmUpload()); 248 } 249 private void btnUpload_Click(object sender, System.EventArgs e) 250 { 251 // 非空检验 252 if (txtAmigoToken.Text.Trim() == "" || txtFilename.Text == "" || txtFileData.Text.Trim() == "") 253 { 254 MessageBox.Show("Please fill data"); 255 return; 256 } 257 // 所要上传的文件路径 258 string path = txtFileData.Text.Trim(); 259 // 检查文件是否存在 260 if (!File.Exists(path)) 261 { 262 MessageBox.Show("{0} does not exist!", path); 263 return; 264 } 265 // 读文件流 266 FileStream fs = new FileStream(path, FileMode.Open, 267 FileAccess.Read, FileShare.Read); 268 // 这部分需要完善 269 string ContentType = "application/octet-stream"; 270 byte[] fileBytes = new byte[fs.Length]; 271 fs.Read(fileBytes, 0, Convert.ToInt32(fs.Length)); 272 // 生成需要上传的二进制数组 273 CreateBytes cb = new CreateBytes(); 274 // 所有表单数据 275 ArrayList bytesArray = new ArrayList(); 276 // 普通表单 277 bytesArray.Add(cb.CreateFieldData("FileName", txtFilename.Text)); 278 bytesArray.Add(cb.CreateFieldData("AmigoToken", txtAmigoToken.Text)); 279 // 文件表单 280 bytesArray.Add(cb.CreateFieldData("FileData", path 281 , ContentType, fileBytes)); 282 // 合成所有表单并生成二进制数组 283 byte[] bytes = cb.JoinBytes(bytesArray); 284 // 返回的内容 285 byte[] responseBytes; 286 // 上传到指定Url 287 bool uploaded = cb.UploadData("http://localhost/UploadData/UploadAvatar.aspx", bytes, out responseBytes); 288 // 将返回的内容输出到文件 289 using (FileStream file = new FileStream(@"c: esponse.text", FileMode.Create, FileAccess.Write, FileShare.Read)) 290 { 291 file.Write(responseBytes, 0, responseBytes.Length); 292 } 293 txtResponse.Text = System.Text.Encoding.UTF8.GetString(responseBytes); 294 } 295 private void btnBrowse_Click(object sender, System.EventArgs e) 296 { 297 if (openFileDialog1.ShowDialog() == DialogResult.OK) 298 { 299 txtFileData.Text = openFileDialog1.FileName; 300 } 301 } 302 } 303 } |
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