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主頁(yè) > 知識(shí)庫(kù) > Asp.Net模擬表單提交數(shù)據(jù)和上傳文件的實(shí)現(xiàn)代碼

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(hù)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：

復(fù)制代碼代碼如下:

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=adminPassword=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：

復(fù)制代碼代碼如下:

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

復(fù)制代碼代碼如下:

-----------------------------7d429871607fe

Content-Disposition: form-data; name="file1"; filename="G:/homepage.txt"

Content-Type: text/plain

腳本之家：https://www.jb51.net

-----------------------------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;
      }
    }
  }
}

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標(biāo)簽：陽(yáng)泉德陽(yáng) 江蘇天門(mén) 新疆蘭州張家界白山

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