asp.net利用HttpWorkerRequest上傳大檔案
前臺頁面
<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="上傳" /><br />
<asp:Label ID="Label1" runat="server"></asp:Label></div>
</form>
後臺頁面
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
//要儲存的位置
string strDesPath = "D:\\";
string strFileName = this.firstFile.PostedFile.FileName;
strFileName =strDesPath + strFileName;
//
this.firstFile.PostedFile.SaveAs(strFileName);
this.Label1.Text = "檔案儲存到了:" + strFileName;
}
配置檔案
<httpModules>
<add name="HttpUploadModule" type="HttpModelApp.HttpUploadModule, HttpModelApp"/>
</httpModules>
<httpRuntime maxRequestLength="2000000" executionTimeout="300"/>
類
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 HttpModelApp
{
//實現IHttpModule介面
public class HttpUploadModule : IHttpModule
{
public HttpUploadModule()
{
}
public void Init(HttpApplication application)
{
//訂閱事件
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; // 已讀資料大小
int read; // 當前讀取的塊的大小
int count = 8192; // 分塊大小
byte[] buffer; // 儲存所有上傳的資料
if (request != null)
{
// 返回 HTTP 請求正文已被讀取的部分。
byte[] tempBuff = request.GetPreloadedEntityBody(); //要上傳的檔案
// 如果是附件上傳
if (tempBuff != null && IsUploadRequest(app.Request)) //判斷是不是附件上傳
{
// 獲取上傳大小
//
long length = long.Parse(request.GetKnownRequestHeader(HttpWorkerRequest.HeaderContentLength));
buffer = new byte[length];
count = tempBuff.Length; // 分塊大小
// 將已上傳資料複製過去
//
Buffer.BlockCopy(tempBuff, //源資料
0, //從0開始讀
buffer, //目標容器
bytesRead, //指定儲存的開始位置
count); //要複製的位元組數。
// 開始記錄已上傳大小
bytesRead = tempBuff.Length;
// 迴圈分塊讀取,直到所有資料讀取結束
while (request.IsClientConnected() &&!request.IsEntireEntityBodyIsPreloaded() && bytesRead < length)
{
// 如果最後一塊大小小於分塊大小,則重新分塊
if (bytesRead + count > length)
{
count = (int)(length - bytesRead);
tempBuff = new byte[count];
}
// 分塊讀取
read = request.ReadEntityBody(tempBuff, count);
// 複製已讀資料塊
Buffer.BlockCopy(tempBuff, 0, buffer, bytesRead, read);
// 記錄已上傳大小
bytesRead += read;
}
if ( request.IsClientConnected() && !request.IsEntireEntityBodyIsPreloaded() )
{
// 傳入已上傳完的資料
InjectTextParts(request, buffer);
}
}
}
}
HttpWorkerRequest GetWorkerRequest(HttpContext context)
{
IServiceProvider provider = (IServiceProvider)HttpContext.Current;
return (HttpWorkerRequest)provider.GetService(typeof(HttpWorkerRequest));
}
/// <summary>
/// 傳入已上傳完的資料
/// </summary>
/// <param name="request"></param>
/// <param name="textParts"></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>
/// 是否為附件上傳
/// 判斷的根據是ContentType中有無multipart/form-data
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
bool IsUploadRequest(HttpRequest request)
{
return StringStartsWithAnotherIgnoreCase(request.ContentType, "multipart/form-data");
}
}
}
注:需新增引用 HttpModelApp.dll