大文件上传

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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="File.aspx.cs" Inherits="BigFile.File" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<script src="jquery-1.4.1.min.js"></script>
</head>
<body>
<form id="form1" runat="server" enctype="multipart/form-data" method="post">
<div>
<input id="firstFile" type="file" name="firstFile" runat="server" /><br />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" /><br />
<asp:Label ID="Label1" runat="server"></asp:Label>
</div>
</form>
</body>

</html>

HttpUploadModule.cs

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Globalization;
using System.IO;
using System.Text;
using System.Web;
using System.Reflection;

namespace BigFile
{
public class HttpUploadModule : IHttpModule
{
public HttpUploadModule()
{

}

public void Init(HttpApplication application)
{
//订阅事件
application.BeginRequest += new EventHandler(this.Application_BeginRequest);
}

public void Dispose()
{
}

private void Application_BeginRequest(Object sender, EventArgs e)
{
HttpApplication app = sender as HttpApplication;
HttpWorkerRequest request = GetWorkerRequest(app.Context);
Encoding encoding = app.Context.Request.ContentEncoding;

int bytesRead = 0; // 已读数据大小
int read; // 当前读取的块的大小
int count = 8192; // 分块大小
byte[] buffer; // 保存所有上传的数据

if (request != null)
{
// 返回 HTTP 请求正文已被读取的部分。
byte[] tempBuff = request.GetPreloadedEntityBody(); //要上传的文件

// 如果是附件上传
if (tempBuff != null && IsUploadRequest(app.Request)) //判断是不是附件上传
{
// 获取上传大小
//
long length = long.Parse(request.GetKnownRequestHeader(HttpWorkerRequest.HeaderContentLength));

buffer = new byte[length];
count = tempBuff.Length; // 分块大小

// 将已上传数据复制过去
//
Buffer.BlockCopy(tempBuff, //源数据
0, //从0开始读
buffer, //目标容器
bytesRead, //指定存储的开始位置
count); //要复制的字节数。

// 开始记录已上传大小
bytesRead = tempBuff.Length;

// 循环分块读取，直到所有数据读取结束
while (request.IsClientConnected() && !request.IsEntireEntityBodyIsPreloaded() && bytesRead < length)
{
// 如果最后一块大小小于分块大小，则重新分块
if (bytesRead + count > length)
{
count = (int)(length - bytesRead);
tempBuff = new byte[count];
}

// 分块读取
read = request.ReadEntityBody(tempBuff, count);

// 复制已读数据块
Buffer.BlockCopy(tempBuff, 0, buffer, bytesRead, read);

// 记录已上传大小
bytesRead += read;

}
if (request.IsClientConnected() && !request.IsEntireEntityBodyIsPreloaded())
{
// 传入已上传完的数据
InjectTextParts(request, buffer);
}
}
}
}

HttpWorkerRequest GetWorkerRequest(HttpContext context)
{

IServiceProvider provider = (IServiceProvider)HttpContext.Current;
return (HttpWorkerRequest)provider.GetService(typeof(HttpWorkerRequest));
}

/// <summary>
/// 传入已上传完的数据
/// </summary>
/// <param ></param>
/// <param ></param>
void InjectTextParts(HttpWorkerRequest request, byte[] textParts)
{
BindingFlags bindingFlags = BindingFlags.Instance | BindingFlags.NonPublic;

Type type = request.GetType();

while ((type != null) && (type.FullName != "System.Web.Hosting.ISAPIWorkerRequest"))
{
type = type.BaseType;
}

if (type != null)
{
type.GetField("_contentAvailLength", bindingFlags).SetValue(request, textParts.Length);
type.GetField("_contentTotalLength", bindingFlags).SetValue(request, textParts.Length);
type.GetField("_preloadedContent", bindingFlags).SetValue(request, textParts);
type.GetField("_preloadedContentRead", bindingFlags).SetValue(request, true);
}
}

private static bool StringStartsWithAnotherIgnoreCase(string s1, string s2)
{
return (string.Compare(s1, 0, s2, 0, s2.Length, true, CultureInfo.InvariantCulture) == 0);
}

/// <summary>
/// 是否为附件上传
/// 判断的根据是ContentType中有无multipart/form-data
/// </summary>
/// <param ></param>
/// <returns></returns>
bool IsUploadRequest(HttpRequest request)
{
return StringStartsWithAnotherIgnoreCase(request.ContentType, "multipart/form-data");
}
}
}

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appSettings>
<add key="ConStringEncrypt" value="false" />

<add key="ImageServerWebPath" value="http://10.10.20.183:84/File/" />

<add key="ImageServerLocalPath" value="E:\主干\WebSites\Manage\File\" />

</appSettings>
<connectionStrings />
<system.web>
<httpRuntime maxRequestLength="2097151" executionTimeout="120"/>
<compilation debug="true" />

<authentication mode="Windows" />
<customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
<error statusCode="403" redirect="NoAccess.htm" />
<error statusCode="404" redirect="FileNotFound.htm" />
</customErrors>

<httpModules>
<add name="HttpUploadModule"
type="BigFile.HttpUploadModule, BigFile" />
</httpModules>

<httpHandlers>
<add path="*.myh" verb="GET" type="MyApp.MyHandler" />
</httpHandlers>

<pages />
<sessionState timeout="6000" />
</system.web>
<system.webServer>
<security>
<requestFiltering >
<requestLimits maxAllowedContentLength="2147483647" ></requestLimits>
</requestFiltering>
</security>
<modules>
<add name="HttpUploadModule" type="BigFile.HttpUploadModule, BigFile"/>
</modules>
<handlers>
<add name="MyHandler" path="*.myh" verb="GET" type="MyApp.MyHandler" preCondition="integratedMode" />
</handlers>
<validation validateIntegratedModeConfiguration="false" />

<directoryBrowse enabled="true" />
<defaultDocument>
<files>
<add value="Login.aspx" />
</files>
</defaultDocument>
<staticContent>
<mimeMap fileExtension=".cfg" mimeType="application/octet-stream" />
</staticContent>
</system.webServer>
</configuration>

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