C# HTTP上传多个文件及传递参数

1、HTTP上传文件及传递参数

    #region 6.0 上传多个文件和参数
    /// <summary>
    /// HttpUploadFile
    /// </summary>
    /// <param name="url"></param>
    /// <param name="files"></param>
    /// <param name="data"></param>
    /// <param name="encoding"></param>
    /// <returns></returns>
    public static string HttpUploadFile(string url, string[] files, Dictionary<string,string> data, Encoding encoding)
    {
        //必须
        string boundary = DateTime.Now.Ticks.ToString("X");
        //必须的
        
        //form 开始标志
        byte[] boundarybytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
        
        //form 结尾标志
        byte[] endbytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");

        //1.HttpWebRequest
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

        request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;
        request.Method = "POST";
        request.KeepAlive = true;
        request.Credentials = CredentialCache.DefaultCredentials;

        using (Stream stream = request.GetRequestStream())
        {
            //传递参数模板 Content-Disposition:form-data;name=\"{0}\"\r\n\r\n{1}
            //1.1 key/value
            string formdataTemplate = "Content-Disposition:form-data;name=\"{0}\"\r\n\r\n{1}";
            //传递参数
            if (data != null)
            {
                foreach (string key in data.Keys)
                {
                    //传递参数开始标识
                    stream.Write(boundarybytes, 0, boundarybytes.Length);

                    string formitem = string.Format(formdataTemplate, key, data[key]);

                    byte[] formitembytes = encoding.GetBytes(formitem);

                    stream.Write(formitembytes, 0, formitembytes.Length);
                }
            }

            //上传文件模板
            //1.2 file
            string headerTemplate = "Content-Disposition:form-data;name=\"{0}\";filename=\"{1}\"\r\nContent-Type:application/octet-stream\r\n\r\n";
            
            byte[] buffer = new byte[6*1024*1024];

            for (int i = 0; i < files.Length; i++)
            {
                //上传文件标识
                stream.Write(boundarybytes, 0, boundarybytes.Length);

                string header = string.Format(headerTemplate, "file" + i, Path.GetFileName(files[i]));

                byte[] headerbytes = encoding.GetBytes(header);

                stream.Write(headerbytes, 0, headerbytes.Length);

                //将文件流读入到请求流中
                using (FileStream fileStream = new FileStream(files[i], FileMode.Open, FileAccess.Read))
                {
                    int r = fileStream.Read(buffer,0,buffer.Length);
                    stream.Write(buffer, 0, r);
                }
            }

            //form 结束标志
            //1.3 form end
            stream.Write(endbytes, 0, endbytes.Length);
        }
        //2.WebResponse
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        using (StreamReader stream = new StreamReader(response.GetResponseStream()))
        {

            string result = stream.ReadToEnd();
            return result;
        }
    }
    
    #endregion

2、测试：

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Collections.Generic;
using System.Text;

public partial class httpUpload_Index : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
     
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string url = "http://172.16.1.110:8888/httpUpload/Index.aspx";string pFilename1 = FileUpload1.PostedFile.FileName;

        string pFilename2 = FileUpload2.PostedFile.FileName;

        string pFilename3 = FileUpload3.PostedFile.FileName;


        string[] files = new string[3] { pFilename1, pFilename2, pFilename3 };

        //string[] files = new string[1] { pFilename1};

        Dictionary<string, string> data = new Dictionary<string, string>();

        data.Add("loginName", "测试");
        data.Add("password", "123456");

        string result = HttpUploadDemo.HttpUploadFile(url, files,data,Encoding.UTF8);
        Response.Write(result);
    }
}

3、HTML页面

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Index.aspx.cs" Inherits="httpUpload_Index" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:FileUpload ID="FileUpload1" runat="server" /> <br /><br />
        
        <asp:FileUpload ID="FileUpload2" runat="server" /> <br /><br />
        
        <asp:FileUpload ID="FileUpload3" runat="server" /> <br /><br />
        
        
        <asp:Button ID="Button1" runat="server"
            Text="上传文件" onclick="Button1_Click" />
    </div>
    </form>
</body>
</html>

4、服务器端

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;

namespace WebThreadTest.httpUpload
{
    public partial class Index : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string password = this.Request["password"];

            string loginName = this.Request["loginName"];

            HttpFileCollection files = Request.Files;

            if (files.Count<=0)
            {
                Response.Write("error");
                return;
            }
            for (int i = 0; i < files.Count; i++)
            {
                HttpPostedFile file = files.Get(i);

                string filename = file.FileName;

                string extension = Path.GetExtension(filename);

                string uploadFilename = DateTime.Now.ToFileTime() + extension;

                string uploadDic = Server.MapPath(@"~/resource/httpUpload/");

                if (!Directory.Exists(uploadDic))
                {
                    Directory.CreateDirectory(uploadDic);
                }

                file.SaveAs(uploadDic + uploadFilename);
            }
            Response.Write("success");

        }
    }
}