Asp.Net模擬表單提交數(shù)據(jù)和上傳文件的實(shí)現(xiàn)代碼
如果你需要跨域上傳內(nèi)容到另外一個(gè)域名并且需要獲取返回值,使用Asp.Net的作為代理是最好的辦法,要是客戶端直接提交到iframe中,由于跨域是無(wú)法用javascript獲取到iframe中返回的內(nèi)容的。此時(shí)需要在自己的網(wǎng)站做一個(gè)動(dòng)態(tài)頁(yè)作為代理,將表單提交到動(dòng)態(tài)頁(yè),動(dòng)態(tài)頁(yè)負(fù)責(zé)將表單的內(nèi)容使用WebClient或HttpWebRequest將表單數(shù)據(jù)再上傳到遠(yuǎn)程服務(wù)器,由于在服務(wù)器端進(jìn)行操作,就不存在跨域問(wèn)題了。
WebClient上傳只包含鍵值對(duì)的文本信息示例代碼:
string uriString = "http://localhost/login.aspx";
// 創(chuàng)建一個(gè)新的 WebClient 實(shí)例.
WebClient myWebClient = new WebClient();
string postData = "Username=admin&Password=admin";
// 注意這種拼字符串的ContentType
myWebClient.Headers.Add("Content-Type","application/x-www-form-urlencoded");
// 轉(zhuǎn)化成二進(jìn)制數(shù)組
byte[] byteArray = Encoding.ASCII.GetBytes(postData);
// 上傳數(shù)據(jù),并獲取返回的二進(jìn)制數(shù)據(jù).
byte[] responseArray = myWebClient.UploadData(uriString,"POST",byteArray);
WebClient上傳只包含文件的示例代碼:
String uriString = "http://localhost/uploadFile.aspx";
// 創(chuàng)建一個(gè)新的 WebClient 實(shí)例.
WebClient myWebClient = new WebClient();
string fileName = @"C:/upload.txt";
// 直接上傳,并獲取返回的二進(jìn)制數(shù)據(jù).
byte[] responseArray = myWebClient.UploadFile(uriString,"POST",fileName);
對(duì)于既包含文件又包含文本鍵值對(duì)信息的示例代碼,需要構(gòu)造表單提交的內(nèi)容,對(duì)于學(xué)asp的同學(xué)來(lái)說(shuō),下面的表單提交內(nèi)容一定不會(huì)陌生
-----------------------------7d429871607fe
Content-Disposition: form-data; name="file1"; filename="G:/homepage.txt"
Content-Type: text/plain
腳本之家:http://www.dbjr.com.cn
-----------------------------7d429871607fe
Content-Disposition: form-data; name="filename"
default filename
-----------------------------7d429871607fe--
所以只要拼一個(gè)這樣的byte[] data數(shù)據(jù)Post過(guò)去,就可以達(dá)到同樣的效果了。但是一定要注意,對(duì)于這種帶有文件上傳的,其ContentType是不一樣的,例如上面的這種,其ContentType為"multipart/form-data; boundary=---------------------------7d429871607fe"。有了ContentType,我們就可以知道boundary(就是上面的"---------------------------7d429871607fe"),知道boundary了我們就可以構(gòu)造出我們所需要的byte[] data了,最后,不要忘記,把我們構(gòu)造的ContentType傳到WebClient中(例如:webClient.Headers.Add("Content-Type", ContentType);)這樣,就可以通過(guò)WebClient.UploadData 方法上載文件數(shù)據(jù)了。
using System; using System.Web; using System.IO; using System.Net; using System.Text; using System.Collections; namespace UploadData.Common { public class CreateBytes { Encoding encoding = Encoding.UTF8; public byte[] JoinBytes(ArrayList byteArrays) { int length = 0; int readLength = 0; // 加上結(jié)束邊界 string endBoundary = Boundary + "-- "; byte[] endBoundaryBytes = encoding.GetBytes(endBoundary); byteArrays.Add(endBoundaryBytes); foreach (byte[] b in byteArrays) { length += b.Length; } byte[] bytes = new byte[length]; // 遍歷復(fù)制 foreach (byte[] b in byteArrays) { b.CopyTo(bytes, readLength); readLength += b.Length; } return bytes; } public bool UploadData(string uploadUrl, byte[] bytes, out byte[] responseBytes) { WebClient webClient = new WebClient(); webClient.Headers.Add("Content-Type", ContentType); try { responseBytes = webClient.UploadData(uploadUrl, bytes); return true; } catch (WebException ex) { Stream resp = ex.Response.GetResponseStream(); responseBytes = new byte[ex.Response.ContentLength]; resp.Read(responseBytes, 0, responseBytes.Length); } return false; } /// 獲取普通表單區(qū)域二進(jìn)制數(shù)組 public byte[] CreateFieldData(string fieldName, string fieldValue) { string textTemplate = Boundary + " Content-Disposition: form-data; name="{0}" {1} "; string text = String.Format(textTemplate, fieldName, fieldValue); byte[] bytes = encoding.GetBytes(text); return bytes; } public byte[] CreateFieldData(string fieldName, string filename, string contentType, byte[] fileBytes) { string end = " "; string textTemplate = Boundary + " Content-Disposition: form-data; name="{0}"; filename="{1}" Content-Type: {2} "; // 頭數(shù)據(jù) string data = String.Format(textTemplate, fieldName, filename, contentType); byte[] bytes = encoding.GetBytes(data); // 尾數(shù)據(jù) byte[] endBytes = encoding.GetBytes(end); // 合成后的數(shù)組 byte[] fieldData = new byte[bytes.Length + fileBytes.Length + endBytes.Length]; bytes.CopyTo(fieldData, 0); // 頭數(shù)據(jù) fileBytes.CopyTo(fieldData, bytes.Length); // 文件的二進(jìn)制數(shù)據(jù) endBytes.CopyTo(fieldData, bytes.Length + fileBytes.Length); // return fieldData; } public string Boundary { get { string[] bArray, ctArray; string contentType = ContentType; ctArray = contentType.Split(';'); if (ctArray[0].Trim().ToLower() == "multipart/form-data") { bArray = ctArray[1].Split('='); return "--" + bArray[1]; } return null; } } public string ContentType { get { if (HttpContext.Current == null) { return "multipart/form-data; boundary=---------------------------7d5b915500cee"; } return HttpContext.Current.Request.ContentType; } } } } using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using UploadData.Common; using System.IO; namespace UploadDataWin { public class frmUpload : System.Windows.Forms.Form { private System.Windows.Forms.Label lblAmigoToken; private System.Windows.Forms.TextBox txtAmigoToken; private System.Windows.Forms.Label lblFilename; private System.Windows.Forms.TextBox txtFilename; private System.Windows.Forms.Button btnBrowse; private System.Windows.Forms.TextBox txtFileData; private System.Windows.Forms.Label lblFileData; private System.Windows.Forms.Button btnUpload; private System.Windows.Forms.OpenFileDialog openFileDialog1; private System.Windows.Forms.TextBox txtResponse; private System.ComponentModel.Container components = null; public frmUpload() { InitializeComponent(); } protected override void Dispose(bool disposing) { if (disposing) { if (components != null) { components.Dispose(); } } base.Dispose(disposing); } private void InitializeComponent() { this.lblAmigoToken = new System.Windows.Forms.Label(); this.txtAmigoToken = new System.Windows.Forms.TextBox(); this.lblFilename = new System.Windows.Forms.Label(); this.txtFilename = new System.Windows.Forms.TextBox(); this.btnBrowse = new System.Windows.Forms.Button(); this.txtFileData = new System.Windows.Forms.TextBox(); this.lblFileData = new System.Windows.Forms.Label(); this.btnUpload = new System.Windows.Forms.Button(); this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog(); this.txtResponse = new System.Windows.Forms.TextBox(); this.SuspendLayout(); // // lblAmigoToken // this.lblAmigoToken.Location = new System.Drawing.Point(40, 48); this.lblAmigoToken.Name = "lblAmigoToken"; this.lblAmigoToken.Size = new System.Drawing.Size(72, 23); this.lblAmigoToken.TabIndex = 0; this.lblAmigoToken.Text = "AmigoToken"; // // txtAmigoToken // this.txtAmigoToken.Location = new System.Drawing.Point(120, 48); this.txtAmigoToken.Name = "txtAmigoToken"; this.txtAmigoToken.Size = new System.Drawing.Size(248, 21); this.txtAmigoToken.TabIndex = 1; this.txtAmigoToken.Text = ""; // // lblFilename // this.lblFilename.Location = new System.Drawing.Point(40, 96); this.lblFilename.Name = "lblFilename"; this.lblFilename.Size = new System.Drawing.Size(80, 23); this.lblFilename.TabIndex = 2; this.lblFilename.Text = "Filename"; // // txtFilename // this.txtFilename.Location = new System.Drawing.Point(120, 96); this.txtFilename.Name = "txtFilename"; this.txtFilename.Size = new System.Drawing.Size(248, 21); this.txtFilename.TabIndex = 3; this.txtFilename.Text = ""; // // btnBrowse // this.btnBrowse.Location = new System.Drawing.Point(296, 144); this.btnBrowse.Name = "btnBrowse"; this.btnBrowse.TabIndex = 4; this.btnBrowse.Text = "瀏覽"; this.btnBrowse.Click += new System.EventHandler(this.btnBrowse_Click); // // txtFileData // this.txtFileData.Location = new System.Drawing.Point(120, 144); this.txtFileData.Name = "txtFileData"; this.txtFileData.Size = new System.Drawing.Size(168, 21); this.txtFileData.TabIndex = 5; this.txtFileData.Text = ""; // // lblFileData // this.lblFileData.Location = new System.Drawing.Point(40, 144); this.lblFileData.Name = "lblFileData"; this.lblFileData.Size = new System.Drawing.Size(72, 23); this.lblFileData.TabIndex = 6; this.lblFileData.Text = "FileData"; // // btnUpload // this.btnUpload.Location = new System.Drawing.Point(48, 184); this.btnUpload.Name = "btnUpload"; this.btnUpload.TabIndex = 7; this.btnUpload.Text = "Upload"; this.btnUpload.Click += new System.EventHandler(this.btnUpload_Click); // // txtResponse // this.txtResponse.Location = new System.Drawing.Point(136, 184); this.txtResponse.Multiline = true; this.txtResponse.Name = "txtResponse"; this.txtResponse.Size = new System.Drawing.Size(248, 72); this.txtResponse.TabIndex = 8; this.txtResponse.Text = ""; // // frmUpload // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(400, 269); this.Controls.Add(this.txtResponse); this.Controls.Add(this.btnUpload); this.Controls.Add(this.lblFileData); this.Controls.Add(this.txtFileData); this.Controls.Add(this.btnBrowse); this.Controls.Add(this.txtFilename); this.Controls.Add(this.lblFilename); this.Controls.Add(this.txtAmigoToken); this.Controls.Add(this.lblAmigoToken); this.Name = "frmUpload"; this.Text = "frmUpload"; this.ResumeLayout(false); } [STAThread] static void Main() { Application.Run(new frmUpload()); } private void btnUpload_Click(object sender, System.EventArgs e) { // 非空檢驗(yàn) if (txtAmigoToken.Text.Trim() == "" || txtFilename.Text == "" || txtFileData.Text.Trim() == "") { MessageBox.Show("Please fill data"); return; } // 所要上傳的文件路徑 string path = txtFileData.Text.Trim(); // 檢查文件是否存在 if (!File.Exists(path)) { MessageBox.Show("{0} does not exist!", path); return; } // 讀文件流 FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read); // 這部分需要完善 string ContentType = "application/octet-stream"; byte[] fileBytes = new byte[fs.Length]; fs.Read(fileBytes, 0, Convert.ToInt32(fs.Length)); // 生成需要上傳的二進(jìn)制數(shù)組 CreateBytes cb = new CreateBytes(); // 所有表單數(shù)據(jù) ArrayList bytesArray = new ArrayList(); // 普通表單 bytesArray.Add(cb.CreateFieldData("FileName", txtFilename.Text)); bytesArray.Add(cb.CreateFieldData("AmigoToken", txtAmigoToken.Text)); // 文件表單 bytesArray.Add(cb.CreateFieldData("FileData", path , ContentType, fileBytes)); // 合成所有表單并生成二進(jìn)制數(shù)組 byte[] bytes = cb.JoinBytes(bytesArray); // 返回的內(nèi)容 byte[] responseBytes; // 上傳到指定Url bool uploaded = cb.UploadData("http://localhost/UploadData/UploadAvatar.aspx", bytes, out responseBytes); // 將返回的內(nèi)容輸出到文件 using (FileStream file = new FileStream(@"c: esponse.text", FileMode.Create, FileAccess.Write, FileShare.Read)) { file.Write(responseBytes, 0, responseBytes.Length); } txtResponse.Text = System.Text.Encoding.UTF8.GetString(responseBytes); } private void btnBrowse_Click(object sender, System.EventArgs e) { if (openFileDialog1.ShowDialog() == DialogResult.OK) { txtFileData.Text = openFileDialog1.FileName; } } } }
- Asp.Net修改上傳文件大小限制方法
- Asp.net MVC中使用JQuery插件ajaxFileUpload上傳文件
- ASP.NET插件uploadify批量上傳文件完整使用教程
- asp.net上傳文件到數(shù)據(jù)庫(kù)的解決方案
- asp.net中MVC借助Iframe實(shí)現(xiàn)無(wú)刷新上傳文件實(shí)例
- asp.net fileupload控件上傳文件與多文件上傳
- Asp.Net的FileUpload類實(shí)現(xiàn)上傳文件實(shí)例
- asp.net實(shí)現(xiàn)上傳文件顯示本地絕對(duì)路徑的實(shí)例代碼
- 如何限制asp.net中上傳文件的大小的代碼
- asp.net 模擬提交有文件上傳的表單(通過(guò)http模擬上傳文件)
- 解決.net項(xiàng)目中上傳的圖片或者文件太大無(wú)法上傳問(wèn)題
相關(guān)文章
asp.net DataFormatString格式化GridView
在GridView里面顯示數(shù)據(jù),要顯示的數(shù)據(jù)有好多位小數(shù),就想讓它只顯示兩位小數(shù),在delphi里,直接用DisplayFormat就行了,2009-08-08Asp.net使用SignalR實(shí)現(xiàn)發(fā)送圖片
這篇文章主要為大家詳細(xì)介紹了Asp.net使用SignalR實(shí)現(xiàn)發(fā)送圖片,需要的朋友可以參考下2016-04-04ASP.NET URL偽靜態(tài)重寫實(shí)現(xiàn)方法
ASP.NET下為靜態(tài)的實(shí)現(xiàn)方法。2009-12-12SignalR中豐富多彩的消息推送方式的實(shí)現(xiàn)代碼
這篇文章主要介紹了SignalR中豐富多彩的消息推送方式的實(shí)現(xiàn)代碼,文中通過(guò)示例代碼介紹的非常詳細(xì),對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值,需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)學(xué)習(xí)吧2019-04-04ASP.NET GridView控件在列上格式化時(shí)間及DataFormatString使用
在GridView綁定日期格式的時(shí)候,數(shù)據(jù)庫(kù)中的日期為2008-07-04,而GridView顯示的是2007-07-04 000000,多了后面一截很不美觀,想把它去掉不知道有什么好的方法,感興趣的朋友可以了解本文,或許對(duì)你有所幫助2013-01-01.NET 解決TabControl 頁(yè)里面多余邊距問(wèn)題經(jīng)驗(yàn)分享
不知道各位同學(xué)有沒(méi)有遇到在向TabPage添加內(nèi)容后,里面的東西總是填不滿 TabPage,總是有幾個(gè)像素的空白邊距2012-04-04使用asp.net改變網(wǎng)頁(yè)上圖片顏色比如灰色變彩色
要能在網(wǎng)站上改變圖片的顏色,比如灰色的變成彩色,彩色的變成灰色多好啊,下面是通過(guò)asp.net實(shí)現(xiàn)的,有需求的朋友可以參考下2014-08-08Server Application Unavailable出現(xiàn)的原因及解決方案小結(jié)
今天在服務(wù)器安裝了個(gè).net 4.0 framework(原本有1.0和2.0的),配置好站點(diǎn)后,選擇版本為4.0,訪問(wèn)出錯(cuò),asp.net經(jīng)常會(huì)出現(xiàn)這個(gè)問(wèn)題,這里腳本之家簡(jiǎn)單的給整理下2012-05-05