Asp.Net模拟表单提交数据和文件信息

  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

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

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

-----------------------------7d429871607fe
Content-Disposition: form-data; name="file1"; filename="G:/homepage.txt"
Content-Type: text/plain
宝玉:http://www.webuc.net
-----------------------------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。

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;
            // 加上结束边界
            string endBoundary = Boundary + "-- ";
            byte[] endBoundaryBytes = encoding.GetBytes(endBoundary);
            byteArrays.Add(endBoundaryBytes);
            foreach (byte[] b in byteArrays)
            {
                length += b.Length;
            }
            byte[] bytes = new byte[length];
            // 遍历复制
            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;
        }
        /// 获取普通表单区域二进制数组
        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} ";
            // 头数据
            string data = String.Format(textTemplate, fieldName, filename, contentType);
            byte[] bytes = encoding.GetBytes(data);
            // 尾数据
            byte[] endBytes = encoding.GetBytes(end);
            // 合成后的数组
            byte[] fieldData = new byte[bytes.Length + fileBytes.Length + endBytes.Length];
            bytes.CopyTo(fieldData, 0); // 头数据
            fileBytes.CopyTo(fieldData, bytes.Length); // 文件的二进制数据
            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 = "浏览";
            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)
        {
            // 非空检验
            if (txtAmigoToken.Text.Trim() == "" || txtFilename.Text == "" || txtFileData.Text.Trim() == "")
            {
                MessageBox.Show("Please fill data");
                return;
            }
            // 所要上传的文件路径
            string path = txtFileData.Text.Trim();
            // 检查文件是否存在
            if (!File.Exists(path))
            {
                MessageBox.Show("{0} does not exist!", path);
                return;
            }
            // 读文件流
            FileStream fs = new FileStream(path, FileMode.Open,
                FileAccess.Read, FileShare.Read);
            // 这部分需要完善
            string ContentType = "application/octet-stream";
            byte[] fileBytes = new byte[fs.Length];
            fs.Read(fileBytes, 0, Convert.ToInt32(fs.Length));
            // 生成需要上传的二进制数组
            CreateBytes cb = new CreateBytes();
            // 所有表单数据
            ArrayList bytesArray = new ArrayList();
            // 普通表单
            bytesArray.Add(cb.CreateFieldData("FileName", txtFilename.Text));
            bytesArray.Add(cb.CreateFieldData("AmigoToken", txtAmigoToken.Text));
            // 文件表单
            bytesArray.Add(cb.CreateFieldData("FileData", path
                                                , ContentType, fileBytes));
            // 合成所有表单并生成二进制数组
            byte[] bytes = cb.JoinBytes(bytesArray);
            // 返回的内容
            byte[] responseBytes;
            // 上传到指定Url
            bool uploaded = cb.UploadData("http://localhost/UploadData/UploadAvatar.aspx", bytes, out responseBytes);
            // 将返回的内容输出到文件
            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;
            }
        }
    }
}

  来源:http://blog.csdn.net/comman1999/article/details/1896302

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