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ASP.NET上传和下载文件的代码

2008-05-03 18:08 816 查看

上传:(可以实现依次上传多个文件)

前台:

<%@ Register TagPrefix="ew1" Namespace="eWorld.UI" Assembly="eWorld.UI, Version=1.9.0.0, Culture=neutral, PublicKeyToken=24d65337282035f2" %>
<%@ Page language="c#" Codebehind="webNewBid.aspx.cs" AutoEventWireup="false" Inherits="STAR.Web.main.Bidding.WebNewBid" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebNewBid</title>
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
<LINK href="../../css/style.css" type="text/css" rel="stylesheet">
<script language="JavaScript">
function addFile()
{
var str = '<BR><INPUT type="file" size="50" NAME="File" runat="server">'
document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str)
}
</script>
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<table class="fullwidth" align="center">
<TR>
<TD vAlign="top">Attachment :</TD>
<TD>
<P id="MyFile"><input id="filMyFile" type="file" size="50" name="filMyFile"> <input onclick="addFile()" type="button" value="Add"></P>
<asp:label id="lblAttachmentError" runat="server" ForeColor="Red"></asp:label><BR>
<asp:button id="btnUpload" runat="server" Text="Upload"></asp:button><asp:label id="lblAttachment" runat="server"></asp:label></TD>
</TR>
</table>
</form>
</body>
</HTML>

后台:

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Collections.Specialized;
private void btnUpload_Click(object sender, System.EventArgs e)
{
HttpFileCollection files = HttpContext.Current.Request.Files;
for(int i = 0; i < files.Count; i++)
{
if (i<files.Count&&i<10)
{
if (files[i].FileName!="" || files[i] != null)
{
int FileSize = 6*1024*1024;
HttpPostedFile myFile = files[i];
string strFilePath = myFile.FileName.ToString().Trim();
this.lblAttachmentError.Text = "<" + strFilePath + ">"; // Show file name
int nFindSlashPos = strFilePath.Trim().LastIndexOf("//")+1;
string UploadFileName=strFilePath.Substring(nFindSlashPos);
string FileName=this.txtWorkOrder.Text+"_"+string.Format("{0:yyMMdd-hhmmss}",DateTime.Now)+"_"+UploadFileName;

if(myFile.FileName.Trim() == "") // Empty value in Browse Box
{
this.lblAttachmentError.Text="No file selected.";
return;
}

if(myFile.ContentLength != 0)
{
if (myFile.ContentLength > FileSize)
{
this.lblAttachmentError.Text="File Size is limited to 6 MB only.";
return;
}
this.lblAttachment.Text+= "<BR>"+FileName;
this.lblAttachmentError.Text="";
// string s=this.Request.PhysicalApplicationPath.ToString().Trim();
// string s1=this.Request.ApplicationPath.ToString().Trim();
// string s3=this.Server.MapPath("");
myFile.SaveAs(this.Request.PhysicalApplicationPath.ToString().Trim()+@"/uploads/" + FileName);
ArrayFileName[i]= FileName;
// // return;
}
else
{
this.lblAttachmentError.Text="File not found.";
return;
}
}
}
else
this.lblAttachmentError.Text="Uploaded File exceed limits.";
}
}

下载:(我只给了后太代码)

public bool ResponseFile(HttpRequest _Request, HttpResponse _Response, string _fileName, string _fullPath, long _speed)
{
try {
FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
BinaryReader br = new BinaryReader(myFile);
try {
_Response.AddHeader("Accept-Ranges", "bytes");
_Response.Buffer = false;
long fileLength = myFile.Length;
long startBytes = 0;
Int16 pack = 10240;
Int16 sleep = Convert.ToInt16(Math.Floor(1000 * pack / _speed) + 1);
if (!(_Request.Headers("Range") == null)) {
_Response.StatusCode = 206;
char[] splitChar = new char[1];
splitChar(0) = "=";
splitChar(1) = "-";
string[][0] range = _Request.Headers("Range").Split("a");
startBytes = Convert.ToInt64(range(1));
}
_Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());
if ((startBytes != 0)) {
_Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength - 1, fileLength));
}
_Response.AddHeader("Connection", "Keep-Alive");
_Response.ContentType = "application/octet-stream";
_Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(_fileName, System.Text.Encoding.UTF8));
br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
long maxCount = Convert.ToInt64(Math.Floor((fileLength - startBytes) / pack) + 1);
long i;
for (int i = 0; i <= maxCount; i++) {
if ((_Response.IsClientConnected)) {
_Response.BinaryWrite(br.ReadBytes(pack));
Thread.Sleep(sleep);
} else {
i = maxCount;
}
}
} catch (Exception e) {
return false;
} finally {
br.Close();
myFile.Close();
}
} catch {
return false;
}
}

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